Herrin Illinois Climate Data

Monthly Average Climate Data for Herrin Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January24.0 °F40.9 °F3.39 in.
February27.2 °F45.9 °F3.07 in.
March35.5 °F55.9 °F4.33 in.
April45.6 °F67.4 °F5.36 in.
May56.0 °F76.3 °F5.22 in.
June64.6 °F84.8 °F4.57 in.
July68.1 °F87.9 °F3.91 in.
August65.6 °F87.0 °F3.09 in.
September57.3 °F81.3 °F3.24 in.
October45.7 °F69.8 °F3.56 in.
November35.8 °F56.3 °F4.23 in.
December28.1 °F45.2 °F3.56 in.
Annual46.1 °F66.6 °F47.53 in.

Climate Data for Herrin 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
2024 plantmaps.com