Thomson Illinois Climate Data

Monthly Average Climate Data for Thomson Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.7 °F29.3 °F1.55 in.
February16.4 °F33.9 °F1.72 in.
March27.4 °F46.4 °F2.43 in.
April38.1 °F59.8 °F3.62 in.
May49.9 °F71.4 °F4.48 in.
June59.9 °F80.8 °F5.13 in.
July63.3 °F84.0 °F4.19 in.
August61.1 °F82.1 °F3.87 in.
September52.6 °F75.9 °F3.65 in.
October41.1 °F62.8 °F2.75 in.
November29.7 °F47.6 °F2.27 in.
December19.4 °F34.8 °F1.9 in.
Annual39.3 °F59.1 °F37.56 in.

Climate Data for Thomson Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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