Ankeny, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.1 °F (low) to 59.6 °F (high). Annual precipitation averages 36 Inches. Ankeny is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.8 °F | 29.5 °F | 0.93 in. |
| February | 15.7 °F | 34.1 °F | 1.11 in. |
| March | 26.9 °F | 47.0 °F | 2.07 in. |
| April | 38.2 °F | 61.1 °F | 3.85 in. |
| May | 50.3 °F | 71.4 °F | 5.08 in. |
| June | 60.5 °F | 80.9 °F | 5.39 in. |
| July | 64.3 °F | 84.8 °F | 4.29 in. |
| August | 61.7 °F | 82.9 °F | 4.19 in. |
| September | 53.1 °F | 76.6 °F | 3.37 in. |
| October | 40.7 °F | 63.4 °F | 2.6 in. |
| November | 28.5 °F | 48.1 °F | 1.82 in. |
| December | 17.6 °F | 34.8 °F | 1.33 in. |
| Annual | 39.1 °F | 59.6 °F | 36.03 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°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 |