West Union Iowa Climate Data

Monthly Average Climate Data for West Union Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.6 °F24.7 °F1.14 in.
February11.1 °F29.0 °F1.17 in.
March23.4 °F42.4 °F2.03 in.
April35.0 °F56.8 °F3.99 in.
May47.0 °F68.8 °F4.85 in.
June57.9 °F78.5 °F5.97 in.
July61.2 °F81.6 °F4.92 in.
August58.6 °F79.5 °F4.14 in.
September50.2 °F73.3 °F3.76 in.
October37.8 °F60.2 °F2.85 in.
November25.7 °F43.8 °F2.0 in.
December14.4 °F30.5 °F1.55 in.
Annual35.8 °F55.8 °F38.37 in.

Climate Data for West Union 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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