Comment by Leftium

Open Meteo lets you query historical weather data from as old as 1940[1].

They have the only weather API I know of that can get both forecast and historical weather with just a single call[2]

I use Open Meteo for most of the data for https://weather-sense.leftium.com

(If you configure a single constant[3], you can get the max 90 days of historical data with the forecast!)

[1]: https://open-meteo.com/en/docs/historical-weather-api

[2]: https://open-meteo.com/en/docs

[3]: https://github.com/Leftium/weather-sense/blob/fefecb05974065...