In December 1989 the average high temperature in Gulkana, AK was 20.6°F, and this was 14.7°F warmer than the average of 5.9°F. The hottest day in December 1989 was 12 December when the temperature reached 39.0°F. Overnight the average temperature in December is -10.5°F and in 1989 the average overnight temperature was 16.5°F warmer at 6.0°F.
In December the average monthly rainfall in Gulkana, AK is 0.50 inches with rain usually falling on 0 days. In December 1989 there was a total of 2.04 inches of rain, that fell on 2 days.