Countries by Average precipitation in depth (mm per year)
Colombia receives 3,240 mm of rain annually, more than any other country. Egypt endures just 18.1 mm per year, the lowest by far. This 17,800% gap reflects how dramatically geographic location determines water availability across 182 countries.
Ranking 2022
Values shown in years.
Analysis
Average precipitation measures the long-term average annual rainfall a country receives, expressed in millimeters. This includes all forms of water falling from clouds: rain, sleet, snow, hail. The metric is crucial because precipitation directly determines water availability for agriculture, drinking, hydropower, and ecosystem health. High precipitation correlates with agricultural productivity and river flows; low precipitation limits farming and requires imports of food or water. All 182 countries in this ranking have 100% official data with zero year-over-year volatility, indicating precipitation patterns are remarkably consistent.
The rankings reveal stark climate zones. Equatorial regions dominate the top: Colombia (3,240 mm), Sao Tome and Principe (3,200 mm), Panama (2,928 mm), Costa Rica (2,926 mm), and Indonesia (2,702 mm) all exceed 2,700 mm annually. Island and maritime nations cluster high: Solomon Islands (3,028 mm, rank 4), Samoa (2,880 mm, rank 7), and Malaysia (2,875 mm, rank 8). Developed nations with moderate climates sit in the middle: Japan (1,668 mm, rank 48), Switzerland (1,537 mm, rank 56), France (867 mm, rank 100), Germany (700 mm, rank 114), and the United States (715 mm, rank 112). Arid regions occupy the bottom: Libya (56 mm, rank 181), Saudi Arabia (59 mm, rank 180), and Egypt (18.1 mm, rank 182) receive negligible rainfall.
A few countries demonstrate how location overrides development level. New Zealand ranks 45th with 1,732 mm despite being a developed island nation in a temperate zone. By contrast, major continental powers receive far less: China (645 mm, rank 123), Russia (460 mm, rank 146), and Canada (537 mm, rank 139). Australia, the driest inhabited continent, receives only 534 mm (rank 141). The data suggests that latitude and proximity to ocean matter far more than industrialization or wealth in determining precipitation. Some tropical developing nations receive triple the rain of wealthy temperate countries.
This metric reports "average" precipitation, masking extreme seasonal variation. Some countries receive most annual rainfall in a few months, while others spread it evenly year-round. The definition counts all water falling from clouds, but doesn't distinguish between rain used by crops and rain that runs to sea immediately. Additionally, precipitation patterns shift with climate systems, and extreme years (droughts, floods) can mask long-term averages. Some countries rely on satellite or interpolated estimates rather than dense ground station networks, particularly in remote regions. The 2022 data may not reflect very recent drought or flood patterns.
Methodology
Average precipitation is defined by the World Bank and FAO as the long-term average annual depth of rainfall and other water falling from clouds in any form. Precipitation includes rain, snow, sleet, and hail. The metric is expressed in millimeters per year averaged over decades of observations. Data comes from the World Bank's World Development Indicators (indicator: AG.LND.PRCP.MM), sourced from meteorological stations and satellite observations. All 182 countries measured reported data from 2022, with 100% of data points classified as official observations. The mean precipitation across all countries is 1,171 mm with a standard deviation of 799 mm, indicating high global variation. Year-over-year changes averaged 0% historically, showing precipitation patterns are remarkably stable over the measurement period.