Hartland Illinois Climate Data

Monthly Average Climate Data for Hartland Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.6 °F29.2 °F1.72 in.
February16.3 °F33.3 °F1.83 in.
March25.8 °F44.9 °F2.28 in.
April36.0 °F57.9 °F3.81 in.
May47.6 °F69.6 °F4.6 in.
June57.3 °F79.1 °F5.05 in.
July61.6 °F82.8 °F3.97 in.
August59.8 °F81.2 °F3.95 in.
September52.0 °F74.5 °F3.63 in.
October40.7 °F61.4 °F2.95 in.
November29.9 °F46.7 °F2.44 in.
December19.4 °F34.1 °F2.02 in.
Annual38.3 °F57.9 °F38.25 in.

Climate Data for Hartland Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsSevere Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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