Marine Illinois Climate Data

Monthly Average Climate Data for Marine Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January22.6 °F39.0 °F2.72 in.
February25.9 °F44.3 °F2.38 in.
March34.8 °F54.7 °F3.39 in.
April45.4 °F66.6 °F4.93 in.
May56.3 °F75.7 °F5.1 in.
June65.2 °F84.6 °F4.73 in.
July68.7 °F87.9 °F4.25 in.
August66.8 °F86.8 °F3.68 in.
September58.2 °F80.5 °F3.29 in.
October46.7 °F68.9 °F3.32 in.
November35.8 °F54.6 °F3.69 in.
December27.2 °F43.5 °F2.78 in.
Annual46.1 °F65.6 °F44.26 in.

Climate Data for Marine Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 6b : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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