Mount Rainier National Park (WA) Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Mount Rainier National Park (WA). The numbers are calculated over a 30-year period to provide a reliable average. Now, let’s break down all the details for a clearer picture.

Mount Rainier National Park is known for its substantial rain/snowfall, with annual precipitation reaching 3498 mm.

Monthly Precipitation Levels

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

The seasons in Mount Rainier National Park , bring significant changes in precipitation. The wettest month, March, receives heavy snow/rainfall, with an average of 539 mm of precipitation.

This snow/rainfall is distributed across 27 snowy/rainy days. In contrast, the driest month, July, experiences much less rainfall, totaling 32 mm over 8 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.

March, the wettest month, has a maximum daytime temperature of -4°C. The city receives 189 hours of sunshine in this period. During the driest month July you can expect a temperature of 11°C. For more detailed insights into the city’s temperatures, visit our Mount Rainier National Park 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

Mount Rainier National Park ’s average annual precipitation is 3498 mm. Let’s compare this to some popular worldwide tourist destinations:

In Lisbon, Portugal, the average annual precipitation is 774 mm, characterized by wet winters and dry summers typical of the Mediterranean climate.

Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm of annual rainfall, mostly in the summer.

Adelaide, Australia, enjoys 511 mm of annual precipitation, with dry summers and wet winters.

Ho Chi Minh City, Vietnam, receives 1955 mm of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.

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 Mount Rainier National Park (WA):

• 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 Mount Rainier National Park (WA)’s weather, including sunshine hours, humidity levels, and temperature data, visit our Mount Rainier National Park (WA) Climate page.