In March, Janesville typically sees daytime highs of 5.7°C and overnight lows around -4.4°C. Compared to the annual average high of 13.9°C, March runs -8.3°C.
March in Janesville averages a daytime high of 5.7°C and an overnight low of -4.4°C.
March runs -8.3°C compared to Janesville's annual average high of 13.9°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 5.7°C and cooler evenings around -4.4°C.