Vernon Illinois Climate Data

Monthly Average Climate Data for Vernon Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January21.9 °F38.2 °F3.01 in.
February25.3 °F43.2 °F2.48 in.
March34.2 °F53.7 °F3.51 in.
April44.5 °F65.8 °F4.58 in.
May55.3 °F75.3 °F5.03 in.
June64.1 °F84.3 °F4.63 in.
July67.2 °F87.4 °F4.02 in.
August64.8 °F86.3 °F3.51 in.
September56.6 °F80.1 °F3.41 in.
October45.1 °F68.4 °F3.39 in.
November35.1 °F54.1 °F3.65 in.
December26.6 °F42.6 °F2.83 in.
Annual45.1 °F65 °F44.05 in.

Climate Data for Vernon Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost100-125 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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