Clima Storico — Durata della Luce Diurna

Microclimatev01.00 credits/fixed

Responsible:Niccolò Calandri

Historical Climate — Daylight Duration

Overview

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.

Calculation Methodology

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.

Data Sources

Code	Name	Provider	Type	Coverage	Availability
`WRD_OPNMT_99`	Open-Meteo Historical Weather	Open-Meteo	db	Global	1940 - present

References

Garner, W.W. & Allard, H.A. (1920). Monthly Weather Review, 48(7), 415.
Open-Meteo Historical Weather API

Data Sources & References

Sources

WRD_OPNMT_99

Methodology

Historical trend of daylight duration (sunrise-sunset). Open-Meteo variable: daylight_duration. Astronomical value. Source: Open-Meteo Historical Weather API. Unit: s.