Clima Storico — Pioggia

Microclimatev01.00 credits/fixed

Responsible:Niccolò Calandri

Historical Climate — Rain

Overview

The Historical Climate — Rain indicator shows daily liquid precipitation (excluding snowfall) recorded at the site over the years. Unlike total precipitation, the rain-only component captures the fraction of water immediately available for soil infiltration and plant uptake. Long-term trends in rainfall regimes — including shifts in seasonal distribution and the snow-to-rain transition as a climate change signal — are critical for assessing site resilience and ecosystem stability.

Calculation Methodology

Data are sourced from the Open-Meteo Historical Weather API, which provides ERA5/ERA5-Land reanalysis data from 1940 to the present at approximately 10 km resolution. The variable used is rain_sum (daily sum of the liquid precipitation component only). Data are spatially interpolated to the site location.

Data Sources

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

References

Hersbach, H. et al. (2020). "The ERA5 global reanalysis". Quarterly Journal of the Royal Meteorological Society, 146(730), 1999-2049.
Muñoz-Sabater, J. et al. (2021). "ERA5-Land: A state-of-the-art global reanalysis dataset for land applications". Earth System Science Data, 13, 4349-4383.
Open-Meteo Historical Weather API

Data Sources & References

Sources

WRD_OPNMT_99

Methodology

Historical series of daily precipitation amount (excluding snow) based on ERA5 reanalysis. Open-Meteo variable: rain_sum. Source: Open-Meteo Historical Weather API. Unit: mm.