In December, Pleasanton typically sees daytime highs of 12.6°C and overnight lows around 4.5°C. Compared to the annual average high of 20.7°C, December runs -8.1°C.
December in Pleasanton averages a daytime high of 12.6°C and an overnight low of 4.5°C.
December runs -8.1°C compared to Pleasanton's annual average high of 20.7°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 12.6°C and cooler evenings around 4.5°C.