Walla Walla Weather in December

The climate in Walla Walla during December can be summarized as cool and reasonably dry.

December is in the winter in Walla Walla and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cold 6°C (42°F), whilst at night -2°C (29°F) is normal.

On average December is the 2nd wettest month of the year in Walla Walla with around 54mm 2.1 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.

On the flip side this corresponds to an average of 1.6 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Walla Walla in December 2025.