In December, Iowa City typically sees daytime highs of 1.3°C and overnight lows around -8.1°C. Compared to the annual average high of 15.4°C, December runs -14.1°C.
December in Iowa City averages a daytime high of 1.3°C and an overnight low of -8.1°C.
December runs -14.1°C compared to Iowa City's annual average high of 15.4°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 1.3°C and cooler evenings around -8.1°C.