In May, Casper typically sees daytime highs of 19.7°C and overnight lows around 4.0°C. Compared to the annual average high of 15.2°C, May runs +4.5°C.
May in Casper averages a daytime high of 19.7°C and an overnight low of 4.0°C.
May runs +4.5°C compared to Casper's annual average high of 15.2°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 19.7°C and cooler evenings around 4.0°C.