Bismarck Illinois Climate Data

Monthly Average Climate Data for Bismarck Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-7.8 °C0.8 °C62.48 mm
February-6.2 °C3.3 °C54.36 mm
March-1.1 °C9.8 °C70.36 mm
April4.8 °C17.2 °C103.12 mm
May11.3 °C23.3 °C117.86 mm
June16.4 °C27.8 °C120.4 mm
July17.8 °C29.3 °C109.22 mm
August16.6 °C28.5 °C84.84 mm
September12.3 °C25.9 °C81.28 mm
October6.1 °C19 °C83.82 mm
November0.3 °C10.6 °C82.8 mm
December-4.7 °C3.6 °C60.71 mm
Annual5.5 °C16.6 °C1031.25 mm

Climate Data for Bismarck Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -23.3°C to -20.6°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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