The weather distribution describes the relative frequency of different weather conditions (sunny, partly cloudy, overcast, light rain, rain, thunderstorm, snow, etc.) in the site area over the selected period. This is a visualisation KPI: no numerical quality score is assigned; instead, a pie or bar chart is produced showing the percentage distribution of weather conditions for the reference year of the polygon.
Weather conditions directly influence pollinator phenology, the nectar production of plants, and bee activity (flight, foraging, hive thermoregulation). Understanding the weather distribution of a site is fundamental for correctly interpreting other environmental KPIs and for planning green management interventions and beekeeping activities.
Data come from Open-Meteo historical hourly series (1940–present) at approximately 10 km resolution, combining ERA5 reanalysis (ECMWF) and station-to-grid meteorological data.
Weather condition classification follows the WMO (World Meteorological Organization) code based on:
cloudcover, %)precipitation, mm/h)rain, mm/h)snowfall, cm/h)showers, mm/h)Weather condition categories (WMO Weather Interpretation Codes):
| WMO Code | Condition | Icon |
|---|---|---|
| 0 | Clear sky | Sunny |
| 1, 2 | Mainly clear / Partly cloudy | Partly cloudy |
| 3 | Overcast | Cloudy |
| 45, 48 | Fog / Depositing rime fog | Fog |
| 51, 53, 55 | Drizzle (light / moderate / dense) | Drizzle |
| 61, 63, 65 | Rain (slight / moderate / heavy) | Rain |
| 71, 73, 75 | Snowfall (slight / moderate / heavy) | Snow |
| 77 | Snow grains | Snow grains |
| 80, 81, 82 | Rain showers (slight / moderate / violent) | Showers |
| 85, 86 | Snow showers (slight / heavy) | Snow showers |
| 95 | Thunderstorm (slight or moderate) | Thunderstorm |
| 96, 99 | Thunderstorm with hail (slight / heavy) | Thunderstorm with hail |
Hourly data are aggregated for the polygon year (site reference year) and the relative frequency of each condition is calculated as a percentage of the total hours in the year.
Unit: percentage (%) of hours per condition
| Code | Name | Provider | Resolution | Availability |
|---|---|---|---|---|
WRD_OPNMT_99 | Open-Meteo Historical Weather | Open-Meteo / ERA5 (ECMWF) | ~10 km | 1940 — present |
This KPI is a visualisation indicator: no quality level (A–E) or numerical range is assigned. The output is a chart showing the percentage distribution of weather conditions for the polygon reference year. Interpretation is contextual: climates with a high frequency of sunny days favour pollinator activity and nectar production, while frequent precipitation or fog can limit flight activity.
Distribution of weather conditions (WMO codes: sunny, cloudy, rain, snow, thunderstorm, etc.) for the selected period. Hourly Open-Meteo data (ERA5, ~10 km, 1940–present) aggregated for the polygon year, categorised by WMO condition type. Relative frequency of each category calculated as a percentage of total annual hours. Visualisation KPI: no numerical range assigned.