In December, Santa Rosa typically sees daytime highs of 29.3°C and overnight lows around 22.4°C. Compared to the annual average high of 31.2°C, December runs -1.9°C.
December in Santa Rosa averages a daytime high of 29.3°C and an overnight low of 22.4°C.
December runs -1.9°C compared to Santa Rosa's annual average high of 31.2°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 29.3°C and cooler evenings around 22.4°C.