In December, Gary typically sees daytime highs of 2.3°C and overnight lows around -5.2°C. Compared to the annual average high of 14.8°C, December runs -12.5°C.
December in Gary averages a daytime high of 2.3°C and an overnight low of -5.2°C.
December runs -12.5°C compared to Gary's annual average high of 14.8°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 2.3°C and cooler evenings around -5.2°C.