In December, Alpharetta typically sees daytime highs of 11.7°C and overnight lows around 0.2°C. Compared to the annual average high of 21.5°C, December runs -9.8°C.
December in Alpharetta averages a daytime high of 11.7°C and an overnight low of 0.2°C.
December runs -9.8°C compared to Alpharetta's annual average high of 21.5°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 11.7°C and cooler evenings around 0.2°C.