Thomasboro Illinois Climate Data

Monthly Average Climate Data for Thomasboro Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.3 °F33.3 °F2.28 in.
February20.4 °F37.9 °F2.04 in.
March29.6 °F49.5 °F2.75 in.
April40.1 °F63.2 °F4.05 in.
May52.1 °F74.3 °F4.44 in.
June61.4 °F82.8 °F4.67 in.
July64.1 °F85.2 °F4.24 in.
August61.7 °F83.8 °F3.39 in.
September54.3 °F79.1 °F3.19 in.
October42.4 °F66.2 °F3.36 in.
November31.9 °F50.9 °F3.09 in.
December22.9 °F38.2 °F2.37 in.
Annual41.5 °F62 °F39.87 in.

Climate Data for Thomasboro 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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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