In December, Arlington Heights typically sees daytime highs of 1.3°C and overnight lows around -6.4°C. Compared to the annual average high of 14.3°C, December runs -13.0°C.
December in Arlington Heights averages a daytime high of 1.3°C and an overnight low of -6.4°C.
December runs -13.0°C compared to Arlington Heights's annual average high of 14.3°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 1.3°C and cooler evenings around -6.4°C.