Historical weather data, all-time temperature records, and monthly climate averages for Mount Vernon, OH. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Mount Vernon runs cool, with a typical high of 58° and low of 33° — though the date has swung wildly, from a balmy 81° in 1986 down to a bitter 19° in 1964. There's nearly a coin-flip chance of rain today (59%), and a lingering 9% chance of snow isn't out of the question this early in spring.
Mount Vernon earns its Midwest stripes with an all-time high of 102° in June 1988 and a bone-chilling -35° in January 1994 — a swing of 137 degrees. The town's most dramatic single day on record was September 14, 1979, when 5.22 inches of rain fell, though April can surprise too: 14 inches of snow dropped on April 5, 1987.
Summer is the sweet spot for visitors, peaking the week of July 16–22 with average highs of 85°, while January bottoms out around 33°. June is the wettest stretch of the year, averaging 1.16 inches of precipitation in its rainiest week, so pack accordingly. If you're chasing dry and warm, late summer through early fall — August and September average highs of 82° and 76° — is your best window.