The Precipitation — Rainfall indicator measures the percentage variation of rainfall compared to the 1961-1990 climatological reference period. Precipitation is a fundamental parameter of local microclimate: it influences water availability for vegetation, groundwater recharge, soil erosion, and biological cycles of pollinators and other organisms.
The KPI compares the mean annual precipitation of the last three years with the historical baseline (1961-1990), providing a synthetic measure of rainfall anomaly. Additional comparisons with the previous three-year period, 10 years ago, and 50 years ago help contextualise the trend over medium and long term.
Data come from the Open-Meteo Historical Weather API, based on meteorological reanalysis models (ERA5, ERA5-Land) with global coverage from 1940 to present.
For each site, the annual precipitation time series is extracted from the geographic position of the site centroid.
100 × (last_3y_mean − baseline_mean) / baseline_meanAbsolute precipitation values are expressed in cm (converted from mm ÷ 10).
| Code | Name | Provider | Type | Coverage | Availability |
|---|---|---|---|---|---|
WRD_OPNMT_99 | Open-Meteo Historical Weather | Open-Meteo | db | Global (~10 km) | From 1940 to present |
Percentage change in rainfall with respect to the 1961-1990 reference period. Formula: 100 × (average last 3 years − reference average) / reference average. Additional comparisons with the previous three-year period, 10 years ago, and 50 years ago. Absolute values in cm (from mm ÷ 10). Source: Open-Meteo Historical Weather API (ERA5/ERA5-Land).