Bismarck Illinois Climate Data

Monthly Average Climate Data for Bismarck Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.9 °F33.5 °F2.46 in.
February20.9 °F38.0 °F2.14 in.
March30.1 °F49.6 °F2.77 in.
April40.7 °F63.0 °F4.06 in.
May52.4 °F73.9 °F4.64 in.
June61.6 °F82.1 °F4.74 in.
July64.1 °F84.7 °F4.3 in.
August61.8 °F83.3 °F3.34 in.
September54.2 °F78.7 °F3.2 in.
October42.9 °F66.2 °F3.3 in.
November32.6 °F51.0 °F3.26 in.
December23.6 °F38.5 °F2.39 in.
Annual41.9 °F61.9 °F40.6 in.

Climate Data for Bismarck Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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