Brighton Illinois Climate Data

Monthly Average Climate Data for Brighton Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5.8 °C3.1 °C63.5 mm
February-3.9 °C6.2 °C56.39 mm
March1.1 °C11.9 °C82.04 mm
April7 °C18.4 °C117.86 mm
May13.1 °C23.7 °C129.79 mm
June18.1 °C28.5 °C104.65 mm
July20 °C30.2 °C94.74 mm
August18.9 °C29.7 °C92.71 mm
September14.2 °C26.3 °C83.82 mm
October7.8 °C19.8 °C82.8 mm
November1.7 °C11.9 °C85.34 mm
December-3.2 °C5.8 °C66.29 mm
Annual7.4 °C18 °C1059.93 mm

Climate Data for Brighton Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 6b : -20.6°C to -17.8°C
Plant Hardiness Zone - 2012Zone 6a : -23.3°C to -20.6°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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