Compare sources
See any location's competing forecasts; get more than just a single number.
Forecast verification with cryptographic fingerprints
Compare forecasts today, audit them whenever.
FernWX preserves what weather providers predicted, compares forecast points against trusted observations, and makes real weather patterns legible for anyone. Start with a ZIP code, address, or place name. Accounts are free for everyone, and you can compare current sources, even signed out.
Keep the vintage
Collection runs add to your database without overwriting the past, preserving the forecast as it was.
Track your places
Accounts are free, and the data is invaluable. Turn your location into a durable scientific ledger.
Join the FernWX public beta
Track the places you care about, keep a forecast history, and compare what different weather sources said.
FernWX is not accepting new beta accounts at the moment. Existing accounts can still sign in.
Make a free account now and FernWX will do the heavy lifting, and it gets better every time you return. Fern will automatically preserve forecast history, track how predictions changed, save storm episodes, and show you whose predictions have been best.