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
Hydrionis holds this measure for one country, so there is nothing here to rank it against.
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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