In May, Castle Rock typically sees daytime highs of 20.1°C and overnight lows around 4.3°C. Compared to the annual average high of 16.8°C, May runs +3.3°C.
May in Castle Rock averages a daytime high of 20.1°C and an overnight low of 4.3°C.
May runs +3.3°C compared to Castle Rock's annual average high of 16.8°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 20.1°C and cooler evenings around 4.3°C.