Weather-code interpretation

Open-Meteo returns WMO weather codes. Harmattan converts them into a smaller product vocabulary in weather-data.js.

Product categories

clear
clouds
rain
storm
fog

Examples

WMO code	Category	Label
0	clear	Clear sky
2	clouds	Partly cloudy
3	clouds	Overcast
45	fog	Foggy
48	fog	Harmattan haze
61	rain	Light rain
65	rain	Heavy rain
82	rain	Violent showers
95	storm	Thunderstorm
99	storm	Severe thunderstorm

A raw WMO code is useful to a machine but poor product language. The interpretation layer lets the rest of the interface work with stable categories rather than scattering numeric-code checks across unrelated files.

Unknown codes fall back to a cloudy presentation state.