WMO Codes
The Open Meteo documentation gives a short description of each code, but the best way to graphically visualize this information in a weather app is not obvious.
Open Weather, another weather API, simply hands you everything on a single page. The previous version of my weather app used Open Weather. (My app’s icons were actually from DarkSky, one of the best weather API’s until they were acquired by Apple.) However I was not satisfied with just mapping the 9 icons onto Open Meteo’s 28 different conditions. Open Meteo provides more information, and I wanted to expose it all!
There are actually 100 unique WMO codes, but Open Meteo only reports a subset of these. Open Meteo groups the codes into rough categories and says the WMO codes are ordered by severity (0 for clear sky to 99 for thunderstorm with hail.)
My re-ordering was slightly subjective, but it revealed a satisfying new way to group the codes into five broad categories. In order of increasing severity:
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