Climate almanac

Mount Zion

Illinois, United States · 39.77°, -88.87°

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What is the climate like in Mount Zion?

The best time to visit Mount Zion is typically August – September, with trip comfort peaking in September (7.1/10). Mount Zion is warmest in July, when daily highs average 85°F (30°C), and coolest in January, when lows fall to about 23°F (-5°C). The wettest month is typically July and the driest is December; the year sees roughly 45 in (1137 mm) of precipitation.

  • Best time to visitAugust – September — comfort peaks in September (7.1/10)
  • Warmest monthJuly — average high 85°F (30°C)
  • Coolest monthJanuary — average low 23°F (-5°C)
  • Wettest monthJuly (5.3 in (133 mm))
  • Driest monthDecember (2.4 in (62 mm))
  • Annual precipitation45 in (1137 mm)
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
  • Records fromDecatur Wtp, 9 km away (1893-2026)