In December, Sioux City typically sees daytime highs of 1.3°C and overnight lows around -9.9°C. Compared to the annual average high of 15.8°C, December runs -14.5°C.
December in Sioux City averages a daytime high of 1.3°C and an overnight low of -9.9°C.
December runs -14.5°C compared to Sioux City's annual average high of 15.8°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 1.3°C and cooler evenings around -9.9°C.