In May, Mount Vernon typically sees daytime highs of 21.3°C and overnight lows around 10.4°C. Compared to the annual average high of 16.1°C, May runs +5.2°C.
May in Mount Vernon averages a daytime high of 21.3°C and an overnight low of 10.4°C.
May runs +5.2°C compared to Mount Vernon's annual average high of 16.1°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 21.3°C and cooler evenings around 10.4°C.