HydrionisGlobal Water Intelligence
Ranking

Wettest countries by average rainfall

Countries ranked by long-term average annual precipitation.

Definition and method

Metric
Annual precipitation
Definition
Total depth of precipitation falling over a defined area in a calendar or water year.
Unit
mm
Period
2025
Basis
Spatially aggregated
Source
Met Office — HadUK-Grid gridded climate observations
Coverage
1 of 205 countries and territories
Places without a held value are absent from the ranking, not ranked last.
Methodology
National figures are area-weighted means of gridded fields interpolated from gauge networks, sometimes blended with radar or satellite estimates.
Wettest countries by average rainfall
Top 1 of 1 countries for which Hydrionis holds a value.
Wettest countries by average rainfallUnited Kingdom: 1,061 mm05001,000mmUnited KingdomUnited Kingdom: 1,061 mm1,061
View the data behind this chart
SubjectValue (mm)Notes
United Kingdom1,061—

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