Mason Illinois Climate Data

Monthly Average Climate Data for Mason Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January21.4 °F37.5 °F3.0 in.
February24.5 °F42.3 °F2.49 in.
March33.4 °F53.1 °F3.42 in.
April43.7 °F65.5 °F4.83 in.
May54.5 °F75.2 °F4.96 in.
June63.5 °F84.1 °F4.93 in.
July66.4 °F87.2 °F4.23 in.
August64.0 °F86.1 °F3.12 in.
September55.7 °F80.3 °F3.2 in.
October44.5 °F68.4 °F3.46 in.
November34.4 °F53.7 °F3.81 in.
December26.2 °F42.0 °F2.92 in.
Annual44.4 °F64.6 °F44.37 in.

Climate Data for Mason Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6b : -5°F to 0°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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