In January, Joliet typically sees daytime highs of -1.2°C and overnight lows around -10.2°C. Compared to the annual average high of 15.3°C, January runs -16.5°C.
January in Joliet averages a daytime high of -1.2°C and an overnight low of -10.2°C.
January runs -16.5°C compared to Joliet's annual average high of 15.3°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near -1.2°C and cooler evenings around -10.2°C.