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Phenological Seasons
Currently available only for Germany in Astronomical Sun Clock (web/PWA). The German regional data do not provide a phenological assessment for other countries.
Astronomical seasons follow the Sun. Phenological seasons follow recurring developments in nature: flowering, leaf emergence, fruit ripening and leaf fall. Their timing depends on weather, local climate and the plants themselves, so the biological year does not necessarily keep pace with astronomical or calendar seasons.
In Central Europe, the phenological year is divided into ten seasons: Winter, Pre-spring, Early spring, Full spring, Early summer, Midsummer, Late summer, Early autumn, Full autumn and Late autumn. Pre-spring may begin while the landscape still looks wintry: hazel and snowdrops can already be flowering.
The German Weather Service (DWD) publishes a current phenological season and reporting figures for seven German regions. The app reads these values from the DWD website.
This function currently works only with German DWD data. Phenological observations are organised differently in other countries: the season classifications, indicator plants, reporting regions and available data sources may differ. The German system therefore cannot simply be transferred to another country.
I would like to add support for other countries. If you can help with reliable national or regional phenology data sources, their access conditions, or the local definitions of the seasons, please get in touch (via GitHub or via email which is included on page 4 of the app).