Winchester Illinois Climate Data

Monthly Average Climate Data for Winchester Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.3 °F35.6 °F2.22 in.
February21.8 °F40.8 °F2.05 in.
March30.9 °F52.2 °F2.97 in.
April41.5 °F64.9 °F4.13 in.
May52.8 °F74.7 °F4.91 in.
June62.2 °F83.4 °F5.29 in.
July65.7 °F86.7 °F4.01 in.
August63.1 °F85.6 °F3.44 in.
September54.7 °F79.8 °F3.35 in.
October43.1 °F67.5 °F2.99 in.
November32.5 °F52.9 °F2.98 in.
December23.7 °F40.7 °F2.25 in.
Annual42.5 °F63.7 °F40.59 in.

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