Simpson Illinois Climate Data

Monthly Average Climate Data for Simpson Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January25.4 °F42.2 °F3.85 in.
February28.3 °F46.6 °F3.45 in.
March36.5 °F56.4 °F4.66 in.
April46.1 °F68.4 °F5.43 in.
May56.4 °F76.8 °F5.29 in.
June64.8 °F85.1 °F4.58 in.
July68.5 °F88.2 °F4.24 in.
August66.3 °F87.3 °F3.14 in.
September58.6 °F81.8 °F3.53 in.
October47.0 °F70.9 °F3.75 in.
November36.5 °F56.9 °F4.43 in.
December29.1 °F46.0 °F4.32 in.
Annual47 °F67.2 °F50.67 in.

Climate Data for Simpson Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCfa - Humid Subtropical Climate
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