Ossian Iowa Climate Data

Monthly Average Climate Data for Ossian Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.4 °F24.3 °F1.06 in.
February10.8 °F28.7 °F1.12 in.
March22.9 °F41.8 °F2.02 in.
April34.6 °F56.3 °F4.01 in.
May46.6 °F68.2 °F4.82 in.
June57.6 °F77.9 °F6.08 in.
July60.9 °F81.1 °F4.64 in.
August58.3 °F79.1 °F4.27 in.
September50.0 °F72.7 °F3.79 in.
October37.6 °F59.6 °F2.84 in.
November25.7 °F43.3 °F1.91 in.
December14.2 °F30.1 °F1.44 in.
Annual35.6 °F55.3 °F38 in.

Climate Data for Ossian Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 4b : -25°F to -20°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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