In December, Rapid City typically sees daytime highs of 4.1°C and overnight lows around -8.9°C. Compared to the annual average high of 15.6°C, December runs -11.5°C.
December in Rapid City averages a daytime high of 4.1°C and an overnight low of -8.9°C.
December runs -11.5°C compared to Rapid City's annual average high of 15.6°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 4.1°C and cooler evenings around -8.9°C.