In December, Decatur typically sees daytime highs of 3.9°C and overnight lows around -5.2°C. Compared to the annual average high of 17.2°C, December runs -13.2°C.
December in Decatur averages a daytime high of 3.9°C and an overnight low of -5.2°C.
December runs -13.2°C compared to Decatur's annual average high of 17.2°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 3.9°C and cooler evenings around -5.2°C.