Olmsted Illinois Climate Data

Monthly Average Climate Data for Olmsted Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-3.1 °C6.2 °C96.77 mm
February-1.4 °C8.9 °C91.69 mm
March3 °C14.3 °C119.89 mm
April8.5 °C20.3 °C132.84 mm
May14.1 °C25.2 °C132.08 mm
June18.8 °C29.9 °C112.52 mm
July20.8 °C31.6 °C98.55 mm
August19.5 °C30.9 °C68.07 mm
September15.1 °C27.8 °C86.87 mm
October8.6 °C21.8 °C99.06 mm
November2.9 °C14.2 °C106.68 mm
December-1 °C8.2 °C109.73 mm
Annual8.8 °C19.9 °C1254.75 mm

Climate Data for Olmsted 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 : -17.8°C to -15°C
Plant Hardiness Zone - 2012Zone 7a : -17.8°C to -15°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCfa - Humid Subtropical Climate
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