Audubon, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.2 °C (low) to 15 °C (high). Annual precipitation averages 880.6 Millimeters. Audubon is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.7 °C | -1.6 °C | 19.81 mm |
| February | -9.6 °C | 1 °C | 25.4 mm |
| March | -3.4 °C | 8.4 °C | 43.94 mm |
| April | 2.5 °C | 15.8 °C | 90.93 mm |
| May | 9.4 °C | 21.7 °C | 128.52 mm |
| June | 15.3 °C | 27.1 °C | 134.62 mm |
| July | 17.3 °C | 28.8 °C | 99.31 mm |
| August | 15.8 °C | 27.7 °C | 108.46 mm |
| September | 10.7 °C | 24.4 °C | 89.15 mm |
| October | 4 °C | 17.3 °C | 70.61 mm |
| November | -3 °C | 8.4 °C | 38.86 mm |
| December | -8.6 °C | 1.2 °C | 30.99 mm |
| Annual | 3.2 °C | 15 °C | 880.6 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |