Audubon, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.8 °F (low) to 59.1 °F (high). Annual precipitation averages 34.7 Inches. 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 | 10.9 °F | 29.1 °F | 0.78 in. |
| February | 14.8 °F | 33.8 °F | 1.0 in. |
| March | 25.8 °F | 47.2 °F | 1.73 in. |
| April | 36.5 °F | 60.5 °F | 3.58 in. |
| May | 49.0 °F | 71.0 °F | 5.06 in. |
| June | 59.6 °F | 80.8 °F | 5.3 in. |
| July | 63.2 °F | 83.9 °F | 3.91 in. |
| August | 60.4 °F | 81.9 °F | 4.27 in. |
| September | 51.3 °F | 76.0 °F | 3.51 in. |
| October | 39.2 °F | 63.2 °F | 2.78 in. |
| November | 26.6 °F | 47.1 °F | 1.53 in. |
| December | 16.6 °F | 34.1 °F | 1.22 in. |
| Annual | 37.8 °F | 59.1 °F | 34.67 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |