Seattle, WA weather in December 2009

Temperature for December 2009

In December 2009 the average high temperature in Seattle, WA was 45.7°F, and this was 0.9°F cooler than the average of 46.6°F. The hottest day in December 2009 was 21 December when the temperature reached 57.0°F. Overnight the average temperature in December is 35.6°F and in 2009 the average overnight temperature was 4.2°F cooler at 31.4°F.

Precipitation for December 2009

In December the average monthly rainfall in Seattle, WA is 5.67 inches with rain usually falling on 19 days. In December 2009 there was a total of 2.74 inches of rain, that fell on 8 days.