In December, Folsom typically sees daytime highs of 12.7°C and overnight lows around 2.9°C. Compared to the annual average high of 23.3°C, December runs -10.6°C.
December in Folsom averages a daytime high of 12.7°C and an overnight low of 2.9°C.
December runs -10.6°C compared to Folsom's annual average high of 23.3°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 12.7°C and cooler evenings around 2.9°C.