Marion Illinois Climate Data

Monthly Average Climate Data for Marion Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January24.0 °F40.9 °F3.64 in.
February27.1 °F46.0 °F3.1 in.
March35.5 °F55.9 °F4.55 in.
April45.6 °F67.5 °F5.46 in.
May56.0 °F76.3 °F5.13 in.
June64.5 °F84.8 °F4.48 in.
July68.0 °F87.9 °F4.03 in.
August65.5 °F87.1 °F3.12 in.
September57.3 °F81.4 °F3.18 in.
October45.7 °F69.9 °F3.54 in.
November35.8 °F56.3 °F4.39 in.
December28.1 °F45.2 °F3.64 in.
Annual46.1 °F66.6 °F48.26 in.

Climate Data for Marion Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
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 ConditionsNormal
Köppen Climate ClassificationCfa - Humid Subtropical Climate