In January, Thunder Bay typically sees daytime highs of -9.6°C and overnight lows around -20.8°C. Compared to the annual average high of 8.0°C, January runs -17.6°C.
January in Thunder Bay averages a daytime high of -9.6°C and an overnight low of -20.8°C.
January runs -17.6°C compared to Thunder Bay's annual average high of 8.0°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near -9.6°C and cooler evenings around -20.8°C.