Thayer Illinois Climate Data

Monthly Average Climate Data for Thayer Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January19.5 °F35.5 °F2.22 in.
February22.8 °F40.7 °F2.05 in.
March32.0 °F52.1 °F2.68 in.
April42.5 °F65.2 °F4.29 in.
May53.9 °F75.0 °F4.66 in.
June63.0 °F83.2 °F4.47 in.
July66.1 °F86.2 °F3.52 in.
August63.9 °F85.1 °F3.14 in.
September55.7 °F79.9 °F3.25 in.
October44.3 °F67.5 °F3.24 in.
November33.8 °F52.5 °F3.1 in.
December24.8 °F40.6 °F2.23 in.
Annual43.5 °F63.6 °F38.85 in.

Climate Data for Thayer 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 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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