In December, Rockford typically sees daytime highs of 0.4°C and overnight lows around -8.3°C. Compared to the annual average high of 14.3°C, December runs -14.0°C.
December in Rockford averages a daytime high of 0.4°C and an overnight low of -8.3°C.
December runs -14.0°C compared to Rockford's annual average high of 14.3°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 0.4°C and cooler evenings around -8.3°C.