Observation

Overview

FMI’s Open Data platform provides access to hourly and daily observation values from the Finnish Meteorological Institute’s station network across Finland. No API key or registration is required — the WFS service is fully public.

Observations are retrieved per station and date range through FMI’s WFS stored queries (fmi::observations::weather::simple for hourly, fmi::observations::weather::daily::simple for daily). FMI caps a single sub-daily request at 168 hours (7 days), so longer hourly ranges are transparently fetched in consecutive windows and stitched back together.

Station metadata comes from the fmi::ef::stations catalogue. It does not expose station elevation, so height is always null. A station’s end_date is null while it is still active.

Not every station measures every parameter — a station/parameter combination that FMI doesn’t have simply contributes no rows, the same as a station reporting no data for a requested date range.

License

Data is © Finnish Meteorological Institute, licensed under CC BY 4.0. See FMI Open Data for further information and usage conditions.