Ainsworth, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.6 °F (low) to 60.8 °F (high). Annual precipitation averages 37.7 Inches. Ainsworth is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.4 °F | 31.1 °F | 1.35 in. |
| February | 18.0 °F | 35.7 °F | 1.58 in. |
| March | 28.5 °F | 48.6 °F | 2.36 in. |
| April | 39.7 °F | 62.3 °F | 3.7 in. |
| May | 51.6 °F | 72.8 °F | 4.97 in. |
| June | 61.6 °F | 82.0 °F | 5.04 in. |
| July | 65.0 °F | 85.4 °F | 4.15 in. |
| August | 62.5 °F | 83.6 °F | 4.2 in. |
| September | 53.6 °F | 77.6 °F | 3.45 in. |
| October | 41.9 °F | 64.7 °F | 2.93 in. |
| November | 30.5 °F | 49.2 °F | 2.22 in. |
| December | 20.2 °F | 36.2 °F | 1.71 in. |
| Annual | 40.6 °F | 60.8 °F | 37.66 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |