Climate almanac

Mount Vernon

Illinois, US · 38.32°, -88.90°

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What is the climate like in Mount Vernon?

The best time to visit Mount Vernon is typically August – October, with trip comfort peaking in September (7.2/10). Mount Vernon is warmest in July, when daily highs average 89°F (32°C), and coolest in January, when lows fall to about 28°F (-2°C). The wettest month is typically May and the driest is September; the year sees roughly 49 in of precipitation.

  • Best time to visitAugust – October — comfort peaks in September (7.2/10)
  • Warmest monthJuly — average high 89°F (32°C)
  • Coolest monthJanuary — average low 28°F (-2°C)
  • Wettest monthMay (5.5 in)
  • Driest monthSeptember (3.1 in)
  • Annual precipitation49 in