Often confused with the wetter coastal Northwest climate, Seattle's annual precipitation ranges from 30 to 36 inches. Most of this falls from mid-September till June often as light to moderate showers.
This marine influence causes Seattle's spring to come relatively late compared to inland locations. Winter rains give way to spring showers. Cold cloudy days change to clear cloudy days, but by mid-June occasional 2-or 3 day stretches of clearer weather can happen.
Summer finally rolls into the area by mid-July and for about 8 weeks you can count on sunny, dry, and mild days. usually temperatures can be found ranging between 75 and 60 F. There is the occasional "heatwave", but different from other locations heatwaves here are measured in hours instead of days. Even on the hottest days, nearing the mid-nineties, nighttime temperatures often fall to 75 or below.
By mid-September the weather starts to the cool. Clear days are replaced with cloudy and occasionally wet weather. By mid-November frost and freezes can occur in the outlying communities. Within the heat island of Seattle temperatures usually range between 55-35 F.
By December sunshine becomes scarce. The short days are cold and wet. Outside of Seattle proper temperatures now range between mid-40's to high 20's. Snow when it does appear is a rare occurrence an rarely last more than a day or two, but just over 15 miles east and west of downtown Seattle daily snowfall totals can sometimes be measured in feet.