The Historical Climate — Daylight Duration indicator shows the historical trend of daily daylight duration, measured from sunrise to sunset. Photoperiod is a fundamental regulator of biological processes: it controls plant flowering, bird migration, pollinator activity, and growing season length.
Data come from the Open-Meteo Historical Weather API. The variable used is daylight_duration (daylight duration in seconds). The value is calculated astronomically based on geographic position and date.
| Code | Name | Provider | Type | Coverage | Availability |
|---|---|---|---|---|---|
WRD_OPNMT_99 | Open-Meteo Historical Weather | Open-Meteo | db | Global | 1940 - present |
Historical trend of daylight duration (sunrise-sunset). Open-Meteo variable: daylight_duration. Astronomical value. Source: Open-Meteo Historical Weather API. Unit: s.