Colchester Illinois Climate Data

Monthly Average Climate Data for Colchester Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.1 °F33.0 °F1.82 in.
February19.8 °F37.7 °F1.94 in.
March29.8 °F50.0 °F2.42 in.
April40.6 °F62.9 °F3.94 in.
May52.4 °F73.3 °F5.15 in.
June62.0 °F82.1 °F4.91 in.
July65.4 °F85.3 °F3.89 in.
August63.0 °F83.7 °F3.63 in.
September54.6 °F78.2 °F3.69 in.
October42.9 °F65.6 °F3.11 in.
November31.6 °F50.7 °F2.68 in.
December21.9 °F38.1 °F1.95 in.
Annual41.7 °F61.7 °F39.13 in.

Climate Data for Colchester 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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