Capital Hill Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Capital Hill. The numbers are calculated over a 30-year period to provide a reliable average. Let's now guide you through the details for a complete overview.

Capital Hill's climate is marked by below-average rain/snowfall, accumulating 298 mm of precipitation yearly.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm)

The seasons in Capital Hill, bring significant changes in precipitation. The wettest month, January, receives moderate rainfall, with an average of 69 mm of precipitation.

This rainfall is distributed across 6 rainy days. In contrast, the driest month, September, experiences much less rainfall, totaling 0.3 mm over 0 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.

January, the wettest month, has a maximum daytime temperature of 17°C. The city receives 208 hours of sunshine in this period. During the driest month September you can expect a temperature of 33°C. For more detailed insights into the city’s temperatures, visit our Capital Hill Temperature page.

Annual Precipitation in the United States of America

The map below shows the annual precipitation across the United States of America. You can also select the different months in case you are interested in a specific month.

Amsterdam Precipitation Compared World Wide

Capital Hill’s average annual precipitation is 298 mm. Let’s compare this to some popular worldwide tourist destinations:

In Barcelona, Spain, the average annual precipitation is 620 mm, evenly distributed across the year with no extreme wet or dry seasons.

In Seoul, South Korea, the average annual precipitation is 1237 mm, with most rain falling during the summer monsoon season.

In Tokyo, Japan, the average annual precipitation is 1528 mm, with significant summer rains due to typhoon season.

Bangkok, Thailand, experiences a tropical monsoon climate with 1668 mm of annual rainfall, with the heaviest precipitation occurring during September and October.

How is Precipitation Measured?

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

Global Warming and Precipitation

Climate change is affecting precipitation patterns worldwide, including Capital Hill:

• Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
• Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.

For more detailed information about Capital Hill’s weather, including sunshine hours, humidity levels, and temperature data, visit our Capital Hill Climate page.