Updated Jan. 14, 2021
As the state's lead agency for water supplies, we pay close attention to multiple data sources and monitor them closely. The Office of the Washington State Climatologist serves as a credible and expert source of climate and weather information for the state. Their monthly newsletter reviews the previous month’s data and provides an outlook for the coming weeks.
December 2020 began with unseasonable warmth, particularly in Central Washington, and some areas of the state had high precipitation and others low. Warm wet weather prevailed on Dec.7 for most of the state. On the Solstice, a cold front hit the state, causing temperatures in SeaTac to drop 20 degrees between 4 and 7 p.m., and the rain briefly turned to snow. Cooler and less active weather finished the year, with little of the Western Washington rainfall reaching east of the Cascades after Christmas. The exception was on Dec. 30 when Spokane broke a daily record with over eight inches of new snow, although it turned to rain later the same day. 2020 ended with normal to above normal snowpack throughout the Olympic and Cascade mountains. Below normal snowpack conditions in the eastern-most parts of the state at the end of the year have since rebounded.
Find details, a link to a survey on what you believe is the “ideal climate,” as well as a climate summary and outlook in the January Climate Newsletter.
You can join a network of volunteers who help map and track precipitation in the United States and Canada.