Walla Walla, WA County has a semi-arid climate that is characterized by hot summers and cold winters with moderate precipitation. Summers in the area are often hot and dry, with temperatures reaching up to the mid-90s Fahrenheit (mid-30s Celsius). During winter months, temperatures can drop down to freezing or below for several weeks at a time. The average annual precipitation is around 11 inches (28 cm) with most of it occurring during the winter months. Winters in Walla Walla County are generally milder than those of other parts of Washington state, often allowing for outdoor activities throughout much of the year.
Walla Walla County, Washington gets 15 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Walla Walla County averages 9 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 191 sunny days per year in Walla Walla County. The US average is 205 sunny days.
Walla Walla County gets some kind of precipitation, on average, 101 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 89 degrees
Winter Low: the January low is 29
Rain: averages 15 inches of rain a year
Snow: averages 9 inches of snow a year