In January, Idaho Falls typically sees daytime highs of -1.5°C and overnight lows around -11.8°C. Compared to the annual average high of 14.5°C, January runs -16.0°C.
January in Idaho Falls averages a daytime high of -1.5°C and an overnight low of -11.8°C.
January runs -16.0°C compared to Idaho Falls's annual average high of 14.5°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near -1.5°C and cooler evenings around -11.8°C.