Weather History
Credits
Weather History is built on data and work that other people give away. This page names all of it. If something here is attributed wrongly, get in touch and it will be fixed.
Weather data
Historical weather comes from Open-Meteo, used under its non-commercial licence. Open-Meteo serves the ERA5 reanalysis produced by ECMWF: measurements from stations, satellites and buoys merged into a model grid, then adjusted to the place you asked about.
The nine-day forecast comes from MET Norway, the Norwegian Meteorological Institute, published under CC BY 4.0.
In the app
Every result screen carries the same two lines at the bottom, so the source of a number is never more than one glance away from the number itself.
Maps and places
There is no tile server behind the map. It draws its own base layer from Natural Earth country outlines — public-domain geometry small enough to ship inside the app, so panning costs no traffic and the map still works with no signal.
The place database comes from GeoNames, licensed under CC BY 4.0. Around fifty thousand cities and towns are searchable, and the coordinates that decide which grid cell your weather is read from come from there too.
Icons and type
- Weather icons after Free Weather Icons by Olexey O., modified for this app.
- Interface type is Noto Sans, released by Google under the SIL Open Font Licence.
- Everything else — layout, illustration, the app itself — is by Skriw.
A note on accuracy
Reanalysis is not the same as a thermometer outside your window. For a date in 1963 the nearest station may have been fifty kilometres away, and the value you see is a model’s best reconstruction of that day. It is usually close. It is not a measurement of your street.
What that means for the numbers in the app, where to expect differences and what to do when a number looks wrong is covered on its own page: How accurate the data is.