Temperature for December
In San Nicolas Island, CA during December the average high temperature is 63.4°F. The hottest day on record was December 3, 2012 when the temperature hit 87.1°F.
Precipitation for December
In December the average monthly rainfall in San Nicolas Island, CA is 0.72 inches with rain usually falling on between 3 and 4 days. 1943 was the driest December with only 0.00 inches of rain falling, and 1996 was the wettest December with 2.43 inches of rain. The wettest single day in December was 10 December 1996 when 1.07 inches of rain fell.
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.