Temperature for December 1989
In December 1989 the average high temperature in Seattle, WA was 48.6°F, and this was 1.9°F warmer than the average of 46.6°F. The hottest day in December 1989 was 5 December when the temperature reached 57.0°F. Overnight the average temperature in December is 35.6°F and in 1989 the average overnight temperature was 1.4°F warmer at 37.0°F.