In December, Santa Rosa typically sees daytime highs of 30.5°C and overnight lows around 18.6°C. Compared to the annual average high of 25.7°C, December runs +4.8°C.
December in Santa Rosa averages a daytime high of 30.5°C and an overnight low of 18.6°C.
December runs +4.8°C compared to Santa Rosa's annual average high of 25.7°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 30.5°C and cooler evenings around 18.6°C.