Seattle, WA Climate in December

Temperature for December

In Seattle, WA during December the average high temperature is 46.6°F. The hottest day on record was December 16, 1980 when the temperature recorded was 63.0°F.

Seattle, WA daily average and extreme temperature range for December

Low Temperature

During December the overnight temperature drops to an average of 35.6°F, with the lowest temperature of 6.4°F being recorded on December 30, 1968. On average there are 2 days in December when the temperature stays below freezing all day. In the worst December there were 7 days when the temperature did not make it above freezing. Overnight temperatures drop below freezing between 1 and 23 times in December.

Precipitation for December

In December the average monthly rainfall in Seattle, WA is 5.67 inches with rain usually falling on between 19 and 20 days. 1985 was the driest December with only 1.76 inches of rain falling, and 1979 was the wettest December with 11.05 inches of rain. The wettest single day in December was 3 December 2007 when 2.74 inches of rain fell.

In December it usually snows on between 3 and 4 days. In December there have been some years when thunderstorms have occurred, although there are other years when there hasn't been a thunderstorm in December.