Dorchester Illinois Climate Data

Monthly Average Climate Data for Dorchester Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January21.1 °F36.7 °F2.53 in.
February24.6 °F42.2 °F2.23 in.
March33.5 °F52.9 °F3.16 in.
April44.1 °F64.8 °F4.73 in.
May55.1 °F74.5 °F5.03 in.
June64.1 °F83.2 °F4.32 in.
July67.4 °F86.2 °F3.92 in.
August65.3 °F85.2 °F3.51 in.
September57.0 °F79.5 °F3.31 in.
October45.5 °F67.5 °F3.26 in.
November34.9 °F53.1 °F3.46 in.
December26.0 °F41.6 °F2.59 in.
Annual44.9 °F64 °F42.05 in.

Climate Data for Dorchester 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 6b : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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