Harrison Illinois Climate Data

Monthly Average Climate Data for Harrison Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January23.9 °F40.8 °F3.12 in.
February27.4 °F45.9 °F3.03 in.
March35.5 °F55.9 °F4.25 in.
April45.8 °F67.2 °F5.35 in.
May56.1 °F76.4 °F5.3 in.
June64.9 °F85.2 °F4.63 in.
July68.4 °F88.0 °F3.89 in.
August65.7 °F86.9 °F3.11 in.
September57.1 °F81.2 °F3.08 in.
October45.5 °F70.0 °F3.71 in.
November35.8 °F56.2 °F4.01 in.
December27.9 °F45.0 °F3.42 in.
Annual46.2 °F66.6 °F46.9 in.

Climate Data for Harrison Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCfa - Humid Subtropical Climate
2024 plantmaps.com