In January, Great Falls typically sees daytime highs of -1.5°C and overnight lows around -13.1°C. Compared to the annual average high of 13.8°C, January runs -15.2°C.
January in Great Falls averages a daytime high of -1.5°C and an overnight low of -13.1°C.
January runs -15.2°C compared to Great Falls's annual average high of 13.8°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near -1.5°C and cooler evenings around -13.1°C.