Mattoon Illinois Climate Data

Monthly Average Climate Data for Mattoon Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January19.8 °F35.7 °F2.58 in.
February22.8 °F40.4 °F2.23 in.
March31.8 °F51.5 °F2.97 in.
April42.6 °F64.1 °F4.74 in.
May54.0 °F74.3 °F4.33 in.
June63.0 °F82.9 °F4.79 in.
July65.8 °F86.0 °F4.16 in.
August63.7 °F84.8 °F2.81 in.
September56.1 °F79.4 °F3.01 in.
October44.7 °F67.0 °F3.6 in.
November33.6 °F52.4 °F3.57 in.
December25.2 °F40.5 °F2.73 in.
Annual43.6 °F63.3 °F41.52 in.

Climate Data for Mattoon 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 ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation