Walla Walla (WA) Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Walla Walla, Washington State, United States of America. This average is based on long-term data collected between 1990 and 2020. Let's now guide you through the details for a complete overview.
Walla Walla maintains relatively dry conditions year-round, with an average annual precipitation of 477 mm (19 in). However, it does have a distinct dry season during certain months, creating distinct seasonal patterns visible in our monthly breakdown below.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
The climate in Walla Walla shows significant variation throughout the year. Expect 69 mm (2.7 in) of precipitation during the wettest month March, distributed over 17 rainy days.
In contrast, July offers drier and sunnier days, with around 7.7 mm (0.3 in) of rainfall over 3 rainy days.
March, the wettest month, has a maximum daytime temperature of 14°C (57°F). During the driest month July you can expect a temperature of 33°C (91°F). For more detailed insights into the city's temperatures, visit our Walla Walla Temperature page.
Annual Rainfall in the United States of America: City Comparison
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.
heavy rainfall
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Walla Walla vs World: Rainfall Compared
Walla Walla's average annual precipitation is 477 mm (19 in). Let's compare this to some popular worldwide tourist destinations:
Seville, Spain, experiences 541 mm (21 in) of rainfall annually, with wet winters and dry summers typical of southern Spain.
Beijing, China, receives 560 mm (22 in) of annual precipitation, concentrated in the summer months.
In Brisbane, Australia, the annual precipitation is 979 mm (39 in), making it wetter than Sydney.
Ho Chi Minh City, Vietnam, receives 1955 mm (77 in) of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.
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.
- Mawsynram in India is noted as being the wettest place on earth, with over 11 meters (36 feet) of rain falling every year.
- In contrast, Antofagasta in Chile is among the driest places on the planet, getting less than 0.1mm (0.004 inches) per year, with some years recording virtually no rainfall.
- Nearly 1,650 thunderstorm cells are estimated over the planet at any given time.
For more detailed information about Walla Walla (WA)'s weather, including sunshine hours, humidity levels, and temperature data, visit our Walla Walla (WA) Climate page.
