Winter Weather in Seattle and Vicinity, Washington

A period of wintry weather was experienced during the first few days of December. An average of around 1 inch of snow was reported on Dec 1, with less than 1 inch on Dec 2, and an average of 1-2 inches on Dec 3 (several reports of 4-5 inches, particularly from Woodinville to Shoreline).

A period of wintry weather was noted across the Western Washington lowlands at the beginning of December, earlier than what is typically experienced. Snow began at the end of November with several rounds continuing through the first few days of September. While accumulations did not meet winter storm criteria Dec 1-2, widespread heavy snow accumulations were experienced on Dec 3. These conditions were largely due to Fraser outflow in the low levels. with deep upper troughing in the upper levels.