Tempest Weather Station with Built-in Wind Meter, Rain Gauge, and Accurate Weather Forecasts, Wireless, App and Alexa Enabled

June 2024 This is an update to my several reviews below, spanning the three years I have owned and used a Tempest Weather station. It is probably best to read the earliest (bottom) review first to gain a full view of my experience. Sadly, in late Fall of 2023 my Tempest Weather station began exhibiting several problems, including intermittent power loss, odd (or no) measurements from certain sensors, and general dysfunction which became progressively worse as the seasonal temperatures became lower and the days shorter. Eventually the unit was no longer providing useful information. I ignored the issue for several months as I was busy with other matters. Eventually I contacted Weatherflow support and was astonished at the speed of response and the interest they demonstrated in fixing the problem. First the support agent checked the data my system had been sending and we agreed on an approximate date the dysfunction became near total. She then compared that date to my purchase date, determined that I was still under warranty when it happened, and immediately offered to send a brand new unit at no charge. Wow! The loss of power issue was determined to be most likely a user- caused problem (that's me) and I was asked to pay for a replacement hub, which was more than fair. The new weather station and hub arrived quickly and I installed them back in their mounts. Once the new unit was online and sending regular data streams, Tempest support merged the old stored data records with the new data records being produced by the replacement machine. I now have a fully functioning weather station and cumulative data records going all the way back to the first day of installation of the original device (minus those days when it was no longer capturing data.) So, the less than perfect news is that the original device had a life span of about 2.5 years before it ceased being useful due to malfunction. The great news is that Weatherflow not only stood behind their product, they were incredibly helpful while doing so. I'm leaving my review at 5 stars, and appending this update to reflect events as they have occurred. I want to commend Weatherflow again for producing the best consumer priced weather station I've ever owned, and for standing behind their product when something went wrong. This is a quality company, with quality employees and I strongly endorse their offering. June 2022 This is an update to my review below, which was originally posted in July of 2021. All of the comments I made in the original review below are still true - except - the accuracy of the rain gain has improved greatly over the past year, just as the Tempest folks said it would. The haptic rain guage collects local data, which is then filtered through AI and compared to other nearby weather data collection devices and systems. After midnight each night, the localized data collected by your Tempest is adjusted to reflect the broader dataset collected from other nearby devices and systems. The post-midnight adjusted rain data is remarkably similar to the two analog rain gauges I have near where my Tempest device is located. It took several months for the accuracy to improve (just like tempest said it would.) It is now nearly identical to the analog gauge measurements. To understand how Tempest heuristic AI works, see this page from their website: https://weatherflow.com/tempest-forecasting/ One year in, I still view my Tempest weather station as (by far) the best of the weather systems priced under $400 that I've owned over the bast two decades. Original review below, posted in July 2021: The Tempest Weather System is the most recent of approximately a half dozen consumer priced weather stations that I have owned over the past 20 years. The two issues that are paramount for me are accuracy and durability. The latter issue (durability) is the usual reason for looking into alternatives as 2 - 3 years seems to be about the norm before the earlier systems I've purchased for $400 or less tend to break down. They usually do not fail all at once, but instead start losing selective components one at a time until the overall unit ceases to be useful. Ease of system setup and the ability to remain connected to both the local WI-FI setup as well as the internet are also important. The Tempest was extraordinary simple to setup and was operational within minutes of being taken out of the box. It has never become disconnected from either my mesh WI-FI setup or the internet since going operational, even though the unit is installed above a metal roof at least 20 meters from the closest WI-FI relay point. The unit is unusual looking and operates using non-traditional technology for several of its data captures (as can be read about on the manufacturer's website.) So far the accuracy as compared to several onsite analog devices is very high. The haptic rain gauge sometimes reads more rain than an analog gauge placed within a few feet. The AI based correction that occurs each night is a bit aggressive and often over-corrects so that the final rain tally is lower than what analog gauge is showing, although the ratio of difference is lessening over time, which is what the manufacturer indicates would occur as the heuristic AI does its magic. On balance, I'd put the overall accuracy of the combined measurements reported from the Tempest system as superior to any of the La Crosse, AccuRite, Davis or Ambient systems I have owned. The Tempest app also displays the reported data in the best manner of any of the above (which of course is a personal opinion.) It is impossible to know for now how durable the Tempest system will prove to be as I've only owned it for two months. Like most consumer technology, the price of weather systems has been decreasing for at least a decade. If the Tempest also proves to be durable it will be a significant improvement over its rivals. In my opinion and for my uses, the Tempest Weather system represents the best value currently available for consumer weather systems under $400. I highly recommend it.

The Tempest weather station was very easy to install and works quite well. I did have a few issues when I was going to do the install because I was installing it in a non-standard way. I live in an RV so is mounting it to the trailer and the back using a pole and amount. Two problems I ran into first off mounting it to the bumper like I plan on doing required me to have a support higher up than needed to stand off from the side of the trailer but hold it so that it wouldn't wobble around a lot. Unfortunately I had to have somebody else do that because I wasn't able to install that myself. Second problem that I ran into was the pipe that I was using to install it onto. It says you need a 3/4 inch pipe to install it on however if you go to the hardware store and order a three quarter inch pipe don't get the plumbing pipe get the structural pipe. The plumbing pipes have threads on them and don't fit the connector for the weather station because of threads. What I did instead was go on to Amazon and find a mounting kit for this type of station that allowed me to install it without having to buy a separate pipe for it. The one I got has a bumper mount kit that screws into the bumper or to your wall either one and then has segments on it that can be removed individually or added to if need be you can buy as many segments as you need to get it as high as you need I bought enough to get it high up at 8 ft. Once I got it installed set up on the software was quite easy. My only regret is that it does not interface with things like weather underground. One of the nice things about it however is it does let you capture data from it using the online system. You can capture it into an Excel spreadsheet quite easily and there's instructions on the web on how to do that if you like to keep data on your weather stations progress. Back when I lived in the house I did that with the weather stations I had posted there and I have several years worth of weather data stored up now I can do the same thing with this one as well. As far as accuracy is concerned the only thing that I was cautioned by support staff was that it does need to be permanently mounted someplace because it requires GPS coordinates to give you accurate readings since it does have a learning system for the area. If you're doing RV living like I am if you're traveling a lot might be a bit of an issue but if you're staying in one place for a long period of time that might not be such a big problem it'll just have to relearn the location each time you go to someplace new. Overall I give this thing to five stars because I do like the unit it's quite nice and it actually tolerates moving around by my trailer quite a bit more than a normal weather station probably would!

TL;DR - great unit, packed with much more than others. Price is a little steep with no dedicated monitor but totally worth it considering your personal expectations. I'm a weather geek and have been in the market for a PWS for years. I finally decided on the Tempest based on glowing reviews, ease of setup, and lack of moving parts that would cause problems for a traditional unit with moving anemometer cups and a rain collector/gauge. I live where winters would be a hassle for constantly cleaning the unit to allow it to take accurate information. I can't speak to Alexa or IFTTT integration- I don't have need for those features. I used the in-box key screw mount to secure the station to a horizontal piece of wood about 7' above grass that's far enough from any building or obstruction to sway the readings. My hub is about 50' from the station with no signal losses. I took my sweet time to get everything going, synced and talking plus siting, testing signal strength, orienting and permanently installing the sensor unit. Total time = 1 hour. If I had to do it again, I could do it in 30 minutes. Pros: • Out of the well-designed package, it was very, very easy to set up and get online with the WeatherFlow network of other sensors that help calibrate this to my particular micro-climate. • The data coming from this is incredibly diverse. After our most recent early summer thunderstorm, it sensed lightning from 26 miles away and recorded the strike that happened 5 miles away in real time. "Feels like" and air temps are calculated as well as barometric pressure and atmospheric density. • The station is powered by 4 solar panels that feed an internal rechargeable battery. In my location, we can go an entire week with overcast weather. The lifetime of a single sunny day's charge can last 2 weeks. • With the firmware update (175), the system will suspend power usage to specific components (wind+direction and rain) if it's not expected. They still report, just not as often. This will conserve energy resources. • The Tempest app and website displays current conditions, graphs over time and weather predictions based on it's location. This info is sharable among several devices or family/friends. • It's possible to share your Tempest's data with WUnderground's network, but my system has yet to be recognized on that network. That's WU's issue, not Tempest's nor WeatherFlow's. • I haven't had the need to contact Tech Support but know it's there. The forum site is robust with information and helps point users to correct articles or notes. • The system will send (controllable) alerts to all devices logged in regarding onset of rain or lightning sensing. A good thing for people who deal with outdoors. Cons: • I didn't rate accuracy because it seems too soon for a review on that technology given the AI adjustments on calibrations yet to come, but my readings so far seem accurate to what I expected. I don't have an analog rain meter or anemometer to compare. I will update this review if my system actually learns about its home. • There is no ability to gauge any metric regarding snowfall, but I can measure it manually. • There is no dedicated monitor for this system. Pretty traditional for many other systems, it was one of the things I looked forward to having. Fortunately, I had an old tablet that I've requisitioned to become that monitor. On a single screen, I can see every metric and detail in real time (+/- 5ish seconds depending on the ECO battery) I highly recommend this weather system for fellow weather geeks who don't care that they don't get to see wind cups, clean or empty rain gauges, or scrape ice to get them working again. I expect when snow and ice pick back up next autumn, all I'll have to do is brush it off and make sure the solar panels are clean and visible.

Summary: Bought this for my wife. She was elated. It has turned into a complete bust. Good: No wires and mounts easily. Bad: Rain Data is random (Actual Rain this year from two calibrated manual rain gauges: 49.64" .Tempest Reported: 27.01 inches.) Temperature during the middle of the day is reported 3-4 degrees below the actual air temperature. We haven't checked wind speed or humidity. But at this point it would be a miracle if they are even close. Technical support is non-existent. We supplied the detailed rain data. Emailed and called multiple times for their ("calibration" support) and they never responded even after we were told the support request was elevated to engineering. History: I bought this for my wife for her Birthday present. She is a weather bug as you can tell in that we record our rainfall to the hundredths of an inch. (actually have records spanning two generations for the last 65 years). Being technology people, we have tried many digital weather stations and the maintenance combined with where they end up mounted seems to make them a short term solution for each new iteration that we try. I found the tempest and read the reviews, "wow! no wires, no batteries and , no moving parts. " What more could you want? We quickly found out the rainfall wasn't accurate, and even though on average it was low, it would report high part of the time. I wasn't worried, Tempest's website said that if you gave them detailed rain amounts that they would adjust their 'haptic" "AI" algorithm. We collected data and tried hard to get some response and have finally given up. Well ok., We don't need to really see the rainfall in real time, so we moved on what can we use it for. Temperature sensors are no "brainer" so we assumed the temperature was accurate. But, to see the temperature and the high and low you have to go load an app (occasionally remember your password or reset it ) and then dig down through multiple screens to finally interpolate the graphs to find what the low and high were for the night and day. Who is has time to do that? We found it made the tempest pretty worthless. I ended up writing a android app and re-purposing a samsung table (mounting it to the wall ) to display the current temperature and last nights low and today's high. It is mounted in the kitchen and has the display on all the time. Yes, a $350 weather station and a $200 tablet + development time to write and debug the app for an outside thermometer with low and high recording: That makes no sense, but I was trying to make lemonade from lemons. We do enjoy walking into the kitchen in the morning and being able to see the outside temp and last night's low from across the room, so it was at least something. Then we had our first heat wave. "Are you sure the temperature is right?" "How can it not be. Temperature sensors are cheap and accurate." "It is mounted on the roof in full sunlight" "But I assume that they have air moving around the sensor and it is showing the air temp" "Please check it." I was wrong tempest couldn't even report an accurate temperature. It reads 3 degrees low at 80F. We are not satisfied.

Pros: - Easy to setup. Easy account creation, simple to connect to 2.4G WiFi, hub unit finds and connects to Tempest easily. The distance between my hub and the Tempest is a good 75ft and it has been totally reliable. ***See edit at bottom. - Easy to mount. Will work with standard 1-1/4" OD TV antenna mast pipe. Point magnetic North with a compass app, tighten clamp and walk away. - The Tempest app really seems polished and presents the info in a logical fashion. And since it also has week+ condensed forecast, it's become my go-to daily driver weather app as well. Lots of options for setting units for pressure, temp, wind. Wind from-direction can be Sub-Cardinal (NNW etc) or Degrees (1 deg resolution) which is awesome. - Update Refresh Rate. Stated to be under 3 seconds, very close to 2 seconds IME. Seeing the wind direction and wind gusts update in real time is amazing. - Accuracy. At first when comparing to other stations I thought it might be off a bit, but I've begun to realize that "hyper-local" conditions really can be quite different than a station a mile away. Sometimes humidity or temp is lower, sometimes higher. That's ok, because it really is, and that's the beauty of a PWS. So overall I seen to be getting very accurate readings. - Durability. WeatherFlow says it's made from a Marine-grade plastic, and it really has a solid, professional feel to it. Best part is there's no anemometer or vane to get snapped off from a twig hitting it. And no maintenance for a clogged rain gauge like on other stations. - Start of rain event notification. For home or a remote location this can be very helpful to know when rain is starting. ( Will catch that storm front light rain before the main rain arrives) - No batteries to replace. Solar cells recharge the battery. Extreme northern locations may struggle a bit but I think they have a booster battery option. - No monthly subscription needed. - API for reading values via local network OFF GRID. Amazing. - The Tempest web site shows all the other stations and there are a lot of them. You can also hide your station. - Alexa integration. Scary easy. "Ask WeatherFlow what the humidity is" etc. From FireTV and other. Cons: - Like any all-in-one PWS, there is a compromise for various readings. If you want accurate wind they say get it up 30 ft in the air, but then perhaps the near-ground temp or humidity might not be as accurate ? I favored the higher mounting myself for less obstructed wind readings. A lot of it depends on the surroundings at your location of course. - The rain sensor seems to use a literal microphone to measure rain hitting the top. It's just not very accurate. And if it is really windy it will show heavy rain when there is none. The rain sensor is a fail if you need truly accurate measurement IMO, but for general things like rain start and generalized rain rate and accumulation it's ok. - See edit/update at bottom of this review for a connectivity issue. Hoping it will last a long long time, as it does cost a bit more than some. Still, it's a bargain IMO compared to Davis Vantage Vue and some others. ***Edit/Update: Had a big wind storm and the power got knocked out for 6 hours or so. After the power was restored, the Tempest sensor unit would not connect to the hub. I had to wait till next day when winds died down and take the big mast down, remove unit, and re-pair to the hub. Also, data was supposed to be saved in the Tempest sensor unit for some period of time, but nothing backfilled historically. So, I would have concerns about deploying this remotely where there is no access at all to the sensor unit.

The installation on this was as easy as it gets. I used the optional Tempest mounting pole so I could mount it to my boat dock. The app is clean and provides a good view of the weather. In addition to the tempest app, I've integrated my feed with Myradar and the Weather Underground systems (Tempest support was great in helping). As to the accuracy, I really don't have a good way to gauge it. I have done some comparisons with other stations around the area, and the readings seem reasonable and in the ballpark. While I suspect the wind speeds may be a little low, that could be due to the siting on our lake with a big hill to the south. Regardless, it's good enough for me.

I had been looking to purchase a weather station for quite a while and the Tempest Weather System has completely lived up to my expectations. Setup was quick and simple and the design looks great once installed. The readings for temperature, pressure and rainfall have all been spot on which gives me confidence in the accuracy of the system overall. Pros • Very easy to install and connect to the app • Sleek design that looks professional outdoors • Highly accurate temperature and rainfall data Cons • Wind readings can vary if placement is near buildings or trees Even though my setup is a bit close to a building which slightly affects the wind readings I am still thrilled with how well the system performs. It gives me detailed real time weather information that feels professional and reliable. For anyone who enjoys tracking local weather data this is a smart long term investment that delivers both function and style.

I'm totally blind. I got this to have some idea of what is going on outside so I know what to maybe expect when I go to take my guide dog out to go to work or just out for a bathroom break or just for a walk. To start out with, I was able to get this out of the box and set it up myself. The receiver has an USB C connector that provides power. So you could run this off of an power band if you need to. The receiver connected to 2.4G Wi-Fi and that is normal for a lot of Smart Home type stuff still. The Receiver does have a mount so you could mount the receiver to a wall with two screws. However you do not need to use the mount of you don't want to. The Tempest weather sensor reminds me of an ice cream cone. Another words, it is kind of rounded at the top and slope in towards the bottom. The sensor has 4 flat panels on it. These are the solar panels. So in this case, the 4 panels kind of form a arrow. This needs to point toward the south. The north side is kind of rounded and there is an arrow on it and that should be pointed North. On the bottom side of the unit when it isn't mounted; There is a slide switch. This is the On/Off switch. The default is off when you receive it new. In the box is two different mounts for the weather sensor. 1 is a round pole mount and the other can be used one of two way. The 1st way is if you already have an 1/4 inch 20 thread screw mount you can screw it down onto that. The other way is you can use a wood screw and just screw it down on top of a wood pole or board. Wants you have the mount in place! Then you can get the receiver online along with the sensor and ensure it is working before you put it outside on the mount. The sensor only goes on the mount one way and turns to lock in place. Yes make sure the sensor is turned on before putting it on the mount! Or you will need to take it back off and turn it on! LOL. I initially received mine on Sunday and got it set up that afternoon. A good thin I did. That night, we got a very good rain so I was able to test it good. By default, you may not get good rain readings do to a setting that Tempest Weather-Flow has turned on by default. Basically what I noticed is when I happened to get up and check it is the rain amount climbed up to about 1.9 inches, dropped back to 1.8 inches, went up to 1.82 inches, dropped back again to 1.79, went up to 1.92, dropped back to 1.9, went up to 2.04, dropped back to 1.95 before it stopped. Needless to say! I wasn't happy. I called them and they said this is due to a settings that tried to ensure your station matches other station that may be around you. If you don't want that happening, then you need to turn off the NC(Near caste) settings that is buried 4 or so levels deep in the Settings tab. Like I said, the default for this is ON. My thoughts , this should be OFF by default and if a user wants it on; They must turn it on. Otherwise with this setting on, the station as far as rain in my case will always be LOW and not low by a little either. It is a lot lower. That day; the person who lives maybe 40 feet directly East of me on his tube gage has 2.38 inches and with the Near Caste on Tempest reports 1.95 inch. Now beings it is off; The Tempest is a lot closer to what he has on his tube gage. It is a little higher but not like it is as far as being hundredths and tenths or greater off lower with their Near Cast on. Myself, I do not like the first screen you are taken to that shows the current weather. The reason why is this screen round numbers and also doesn't reflect the readings from your physical station. Example, this past night, the station told me rain detected at 9:30PM. The first screen showed no rain for the prior day when I checked it at 3AM. However when I went to the details screen to see the current readings from the station itself, it showed .01 of an inch for the prior day. Same when I went to the History tab. The default weather screen in the Tempest App round Temperature, Pressure and who knows what else. If you tap on the first line that gives the temperature! This will then take you to the current readings for your weather station and no rounding is done on this screen. So you can then see the current pressure and not have it rounded up to the nearest 10th. Same for Temperature. The Alexa skill for Tempest. This for the most part only give you the same information when you first go into the Tempest App. It will not give you the real feel temperature. I've not found a way to get that. I would like to know that but cannot get that information through Alexa. Same goes, it reported no rain for the above I stated. Just now, when I went into the App and Alexa it is reported no Rain today. But when I go into the detail screen in the App; It shows a trace of rain and said it was for 5 minutes. A lot of this you can also get through your web browser on the PC as well. So wants your weather station is online, you can just use your PC web browser if you want. The detail screen updates in real time for the most part. So you can just sit and watch some stuff change like wind speed, lightning if you are getting some in the area and the like. You can also see battery information for the sensor too. The Alexa skill uses the NC(Near Caste) for the Rain amount; So it will never be correct unless you have the NC option turned on in the App so that the details match what Alexa says. But like I said above; That causes the App to be low by a LOT and no ware near the correct rain amount. Also being the Tempest rain station round up! If you get a lot of short showers within a day! This compounds the issue of it being off even more being it rounds up. Then on top of that, being this counts rain drops for the most part and as we know; not all rain drops are the same size! The Tempest rain gage is never going to be correct compared to an old rain tube. So if you think of all the above; You can see this will NEVER be correct! Then having the NC(Near Caste) ON by default; just makes matter worce. You can display a device's battery voltage card in the app. To enable the battery card on the data display, in the app, go to Settings > Stations > (choose a station) > Advanced > tap 'Show Battery Card' > tap Save on the settings menu. Then that information will display in the details information. Same for when you use a web browser on your PC. How good is the Temperature detection? Well for me, it semes to be good. It matches an Sensor push temperature reading in the morning as well as my old Natatmo weather station. During the day, they don't match! But again, I don't expect them to being Tempest is on a post on my deck and the other two sensors are closer to the floor of the deck by 2 feet lower and about 3 feet from the deck floor. The Tempest is about 5 feet from the floor. The temperature reading is maybe 1 or 2F different then what NOAA gives during the day. That reading is about 5-6 miles East of me at the airport. So temperature is good. Humidity reading! Again, I have 3 different sensors and none of them agree! Sensor push, Natatmo and this one. The Sensor push and this one are within 10% of one another. Well the Natatmo has always been high. So for me, the humidity reading isn't correct at all. Always high. This is even true when the Humidity is less than 50%. This is way off when humidity is greater than 80%. Pressure! Again, I have three and they do not agree. Sensor push, Natatmo and this one. This one to the 10th is for the most part right on. But like I said, if you use the main screen on the App or Alexa! Expect rounding up for the numbers and I would like the ability to turn that off. I want to see to the 100th like NOAA gives it. I shouldn't have to go to the station details in order to get that information. Wind gage! I really can't say how good or bad this is; But being the Natatmo wind gage uses the same type of system and it was never correct! I expected that from the get go for this station. But I also expected it not to be correct being it is on the outside corner of my deck with other buildings and the like around and not up in the air over 33 feet. But again, I didn't buy it for that functionality. I got it for Temperature and to mainly know if it is raining so I know if I need to take my umbrella with me with I go out with my guide dog. The lightning detecting looks to work! Is it correct on how far it is away; Probably not. Also you may want to turn off that in the App notification or it may bug you a lot like every 20 or so minuts and no rain at all. After all, the lightning could be 20 plus miles away and you may never even get any in your area. I found it a nuisanc having it on. I also turned off the update so I didn't want to keep getting weather updates on my phone every 20 minute to hour. The tempest weather sensor if it can't talk to the receiver! It can store data up to about 1 hours worth. The Tempest receiver if it can't talk to the Tempest Weather-Flow servers, can hold about 1 weeks worth of data. Do I expect this to last 10 years with the battery that is in it; The answer to that is NO. I've found most type of these batteries last about 3 to 5 years. So that is what I'm expecting. Also in checking 5 or 6 other stations around me, and looking at the history for them! Give you a good understanding of how long a person may have had a station. The other station are reporting 2.5 plus on the battery. One station is reporting 2.41 or so on battery. But that station going by the history is 4 plus years old. So basically kind of confirms what I said! Maybe 3 to 5 years for the battery before you need to get a new station and hopefully there will be something better on the market. So if you are expecting 10 years! You aren't going to get that at all on the battery. Nothing else, think of your cell phone battery. They don't last 10 years and neither will this. Information on the Tempest weather station you should know before buying. Keeping in mind, the below is only of the Tempest has a good battery charge. If the battery is low, the reading can be taken less often or in the case of the rain sensor not at all. 2.35V is the cut off and things go to a low power state about the 2.4 range. Ultrasonic anemometer samples wind speed and direction every 3 seconds These 3-second readings are then averaged to provide 1-minute observations, including lull (lowest 3-second reading) and gust (highest 3-second reading). So you aren't going to see what the highest wind is within 15 minutes as an example. All other sensors are generally reported once per minute. The Lightning strikes are instantaneously reported upon detection. The haptic rain sensor also reports instantaneous rain start events when more than 5 seconds of continuous rain occurs. What are the rates of the rain intensity values? VERY LIGHT: < 0.25 mm/hour less than 1 hundredth of an inch per hour. LIGHT: ≥ 0.25, < 1.0 mm/hour Over 1 hundredth to 4 hundredth per hour. MODERATE: ≥ 1.0, < 4.0 mm/hour 4 hundredth to 0.16 per hour. HEAVY: ≥ 4.0, < 16.0 mm/hour 0.16 to 0.63 inches per hour. VERY HEAVY: ≥ 16.0, < 50 mm/hour 0.63 to 2 inches per hour. EXTREME: > 50.0 mm/hour this is greater than 2 inches per hour. Pressure trends: The following trends are determined from changes over 3 hour intervals... "Falling"/"Rising" if the magnitude of the pressure change is ≥ 1 mb "Steady" if the magnitude of the pressure change is ≤ 1 mb Temperature accuracy is ± 0.4 °C this is about 1F and humidity is accurate to ± 4% below 80%. Notice says nothing about anything about how it is when the humidity is greater than 80%. So humidity isn't very good at least to me. Explains the above! Atmospheric pressure accuracy is ± 0.03 inHg (±1 millibar).