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Open-Meteo -- Global coverage, no API key required.
National Weather Service -- US-only, official NOAA data.
Sap Flow Calculation
Sap flow conditions are calculated from daily high and low temperatures. A freeze overnight (below 32F / 0C) followed by a daytime thaw signals a sap flow day.
Extended Forecast
Historical 5-year temperature averages extend the forecast out to 45 days.
Historical Weather for Past Seasons
When you switch to a past season that has tap dates, the app automatically fetches historical weather data for any missing dates in that season's range. This works even if some weather entries already exist for that season. Manual weather entries are preserved and never overwritten.
Auto-Fetch
When enabled, weather data is fetched automatically when the app is opened.
Temperature Units
Fahrenheit and Celsius supported, with auto-detection from location.