In December, Rocklin typically sees daytime highs of 12.6°C and overnight lows around 2.6°C. Compared to the annual average high of 22.9°C, December runs -10.3°C.
December in Rocklin averages a daytime high of 12.6°C and an overnight low of 2.6°C.
December runs -10.3°C compared to Rocklin's annual average high of 22.9°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 12.6°C and cooler evenings around 2.6°C.