How many hours of daylight does this need for continuous operation? I live in the North, where the nights get long.

I've had a Tempest since it was first introduced. It's relatively easy to set up and maintenance free. I live in the Pacific Northwest and the Tempest is pretty useless during wintertime as the solar panels don't get enough ambient light to fully charge. For the last year, WeatherFlow has promised a battery power pack accessory to mitigate this issue but they keep delaying its release.

Other than the initial cost of the sensor unit, is there any on-going access fee or subscription charge that is required to use the system?

Hi there! The Tempest Weather System is a one-time purchase and there are no required subscriptions/fees for ongoing use. I hope this helps! Kind regards,

We live in the mountains and frequently get storms with large damaging hail. Is the Tempest sensor warranted against hail damage?

I also live in the mountains but in the tropics so I cannot directly answer about hail. I do however want to mention how in my opinion, their warranty is really, really good. I had occasion where my Tempest was recording accurately but not keeping history. Weather-Flow immediately sent me a new one, no questions asked, and indeed, did not even request that I return the faulty one. Just a great experience and I'm sure they would give support in the case of hail. Cheers, Marcel Lauzon, Costa Rica

Does this weather station measure to the nearest whole degree or tenth of a degree?

On the main screen of the Tempest iPad app and on my Apple watch the temperature is displayed as a whole number. However, if you select the device on the main screen of the iPad tempest app you get more detailed information and on this page it displays temperature as xx.x (i.e. in tenths). Thus I believe the answer to your question is that it measures it to tenths of a degree although it displays it to the nearest whole degree depending on where you look.

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🌦️ Own the Forecast, Own the Day!

PRECISION YOU CAN TRUST - Machine learning-driven hyper-local forecasts with ±0.5°C accuracy keep you ahead of the weather curve.
INSTANT WEATHER INSIGHTS - Wireless sensor transmits updates every 3 seconds, delivering lightning, UV, wind, and rainfall data straight to your phone.
EFFORTLESS SMART HOME SYNC - Seamlessly integrates with Alexa, IFTTT, Rachio, and more to automate your home based on real-time weather data.
MAINTENANCE FREE DURABILITY - No moving parts and solar power mean years of reliable, near-zero upkeep in any environment.
QUICK SETUP INSTANT ACCESS - Install in minutes with WiFi and the intuitive Tempest app—weather mastery is just a few taps away.

The WeatherFlow Tempest Weather System is a cutting-edge, solar-powered weather station featuring ultrasonic sensors for wind speed and direction, a rain gauge with real-time updates every 3 seconds, and advanced machine learning for hyper-local, highly accurate forecasts. Wireless with a 1000+ ft range and seamless smart home integration, it offers effortless installation and maintenance-free operation, trusted by over 85,000 users and top publications alike.

Технические характеристики

Brand	WeatherFlow
Recommended Uses For Product	Garden, Home
Specific Uses For Product	Lightning Detection, Precipitation, Temperature, UV Index, Wind Speed
Power Source	Solar Powered
Special Feature	Advanced Weather Forecasting using Machine Learning
Material	Plastic
Connectivity Technology	Wi-Fi
Number of Batteries	1 Lithium Ion batteries required.
Style	Modern
Finish Type	Glossy
Colour	White
Included Components	Instruction Manual
Temperature Accuracy	0.5 °C
Are Batteries Included	No
Sensor Technology	Ultrasonic
Upper Temperature Rating	140 Degrees Fahrenheit
Frequency	0.33 Hz
Item Weight	1.6 Pounds
Manufacturer	WeatherFlow
Shape	Rectangular
Display Type	no display
UPC	859883004298
Model number	2020
Item Weight	726 g
Product Dimensions	10.75 x 10.75 x 22 cm; 725.75 g
Batteries	1 Lithium Ion batteries required.
Item model number	2020
Item Height	22 Centimeters
Item Width	10.75 Centimeters
Lithium battery energy content	3.12 Watt Hours
Lithium Battery Packaging	Batteries contained in equipment
Lithium battery weight	0.49 g
Number of lithium metal cells	1