Grantfork Illinois Climate Data

Monthly Average Climate Data for Grantfork Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January21.9 °F38.2 °F2.71 in.
February25.4 °F43.5 °F2.37 in.
March34.3 °F54.1 °F3.35 in.
April44.8 °F66.1 °F4.9 in.
May55.6 °F75.4 °F5.04 in.
June64.6 °F84.3 °F4.69 in.
July68.1 °F87.5 °F4.27 in.
August65.9 °F86.5 °F3.66 in.
September57.5 °F80.2 °F3.31 in.
October45.8 °F68.5 °F3.34 in.
November35.2 °F54.1 °F3.69 in.
December26.7 °F42.9 °F2.79 in.
Annual45.5 °F65.1 °F44.12 in.

Climate Data for Grantfork 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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