In December, Gilroy typically sees daytime highs of 14.1°C and overnight lows around 1.9°C. Compared to the annual average high of 21.3°C, December runs -7.2°C.
December in Gilroy averages a daytime high of 14.1°C and an overnight low of 1.9°C.
December runs -7.2°C compared to Gilroy's annual average high of 21.3°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 14.1°C and cooler evenings around 1.9°C.