In December, Santa Rosa typically sees daytime highs of 30.1°C and overnight lows around 14.2°C. Compared to the annual average high of 23.4°C, December runs +6.7°C.
December in Santa Rosa averages a daytime high of 30.1°C and an overnight low of 14.2°C.
December runs +6.7°C compared to Santa Rosa's annual average high of 23.4°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 30.1°C and cooler evenings around 14.2°C.