Maryville Illinois Climate Data

Monthly Average Climate Data for Maryville Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January23.8 °F39.8 °F2.7 in.
February27.0 °F45.3 °F2.42 in.
March35.9 °F55.6 °F3.49 in.
April46.6 °F67.1 °F4.95 in.
May57.5 °F76.2 °F5.24 in.
June66.4 °F84.9 °F4.8 in.
July70.1 °F88.0 °F4.33 in.
August68.1 °F87.0 °F3.86 in.
September59.8 °F80.6 °F3.23 in.
October48.7 °F69.1 °F3.29 in.
November36.8 °F54.9 °F3.64 in.
December28.5 °F44.3 °F2.75 in.
Annual47.4 °F66.1 °F44.7 in.

Climate Data for Maryville Illinois

Average First Frost DateNov. 1 - Nov. 10
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 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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