In December, Missoula typically sees daytime highs of -1.7°C and overnight lows around -9.6°C. Compared to the annual average high of 11.0°C, December runs -12.7°C.
December in Missoula averages a daytime high of -1.7°C and an overnight low of -9.6°C.
December runs -12.7°C compared to Missoula's annual average high of 11.0°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near -1.7°C and cooler evenings around -9.6°C.