In April, Janesville typically sees daytime highs of 14.5°C and overnight lows around 2.4°C. Compared to the annual average high of 13.9°C, April runs +0.6°C.
April in Janesville averages a daytime high of 14.5°C and an overnight low of 2.4°C.
April runs +0.6°C compared to Janesville's annual average high of 13.9°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 14.5°C and cooler evenings around 2.4°C.