Fort Atkinson Iowa Climate Data

Monthly Average Climate Data for Fort Atkinson Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.8 °F25.1 °F1.04 in.
February11.5 °F29.5 °F1.1 in.
March23.4 °F42.6 °F2.0 in.
April35.0 °F57.5 °F3.95 in.
May46.8 °F69.4 °F4.64 in.
June57.4 °F78.9 °F5.97 in.
July60.8 °F82.0 °F4.77 in.
August58.3 °F80.1 °F4.21 in.
September49.8 °F73.9 °F3.77 in.
October37.6 °F60.7 °F2.8 in.
November25.7 °F44.2 °F1.84 in.
December14.7 °F30.8 °F1.44 in.
Annual35.7 °F56.2 °F37.53 in.

Climate Data for Fort Atkinson 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