average rain in seattle
Seattle Temperatures by Month. The notoriously rainy, dreary winters in Seattle can be jarring, so if youâre going to the city between November and March, donât forget your raincoat and galoshes. The heavy rain is generally expected between January and May and October and December. The region gets over 65 percent of its rainfall during winter, which doesnât give too many chances for clear days. In fact, the average yearly precipitation is 37 inches and rain averaging 50 percent of the time.