In December, Vacaville typically sees daytime highs of 13.0°C and overnight lows around 3.5°C. Compared to the annual average high of 23.0°C, December runs -10.0°C.
December in Vacaville averages a daytime high of 13.0°C and an overnight low of 3.5°C.
December runs -10.0°C compared to Vacaville's annual average high of 23.0°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 13.0°C and cooler evenings around 3.5°C.