Postville Iowa Climate Data

Monthly Average Climate Data for Postville Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.7 °F24.8 °F1.08 in.
February11.0 °F29.3 °F1.19 in.
March23.2 °F42.3 °F2.25 in.
April34.7 °F56.8 °F4.15 in.
May46.6 °F68.8 °F4.98 in.
June57.6 °F78.5 °F5.85 in.
July60.9 °F81.7 °F4.63 in.
August58.3 °F79.9 °F4.26 in.
September49.9 °F73.2 °F3.95 in.
October37.6 °F60.2 °F2.95 in.
November25.9 °F43.7 °F2.0 in.
December14.6 °F30.6 °F1.48 in.
Annual35.7 °F55.8 °F38.77 in.

Climate Data for Postville Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
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