Analyze seattle's precipitation patterns and trends from 1978 to present. View monthly and yearly rainfall data, historical precipitation records, and climate change effects on seattle's weather patterns. This page shows the average precipitation (including snowfall) in each month of the year in seattle, washington.

Seattle experiences significant rain/snowfall throughout the year, averaging 1009 mm of precipitation annually. However, this abundant rainfall is not evenly distributed, with a distinct dry season during Ò€¦ In an average year, at least 0. 01 inches (0. 25 mm) of precipitation falls on 150 days, more than nearly all u. s. Cities east of the rocky mountains. In november, seattle averages more rainfall than any other Ò€¦ Seattle averages 39. 34 inches of precipitation a year, with the vast majority falling as rain instead of snow. Official precipitation totals for the city are measured at sea-tac airport, which is actually Ò€¦

In november, seattle averages more rainfall than any other Ò€¦ Seattle averages 39. 34 inches of precipitation a year, with the vast majority falling as rain instead of snow. Official precipitation totals for the city are measured at sea-tac airport, which is actually Ò€¦ Monthly temperature, precipitation and hours of sunshine. A climate graph showing rainfall, temperatures and normals.