Northfield Illinois Climate Data

Monthly Average Climate Data for Northfield Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.4 °F31.6 °F2.13 in.
February20.9 °F35.6 °F2.04 in.
March29.7 °F45.3 °F2.21 in.
April39.5 °F56.7 °F3.8 in.
May50.3 °F68.5 °F4.73 in.
June60.1 °F78.6 °F4.34 in.
July66.3 °F83.1 °F3.7 in.
August65.4 °F81.5 °F4.12 in.
September57.8 °F74.9 °F3.47 in.
October45.7 °F62.6 °F3.5 in.
November34.1 °F48.3 °F2.63 in.
December24.3 °F37.0 °F2.29 in.
Annual42.7 °F58.6 °F38.96 in.

Climate Data for Northfield Illinois

Average First Frost DateOct. 21 - Oct. 31
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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