Hills, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.5 °F (low) to 60.5 °F (high). Annual precipitation averages 37.3 Inches. Hills 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 | 14.0 °F | 30.5 °F | 1.22 in. |
| February | 17.5 °F | 35.0 °F | 1.47 in. |
| March | 28.5 °F | 48.1 °F | 2.32 in. |
| April | 39.6 °F | 62.1 °F | 3.76 in. |
| May | 51.6 °F | 72.8 °F | 4.72 in. |
| June | 61.7 °F | 82.0 °F | 5.15 in. |
| July | 65.2 °F | 85.4 °F | 4.24 in. |
| August | 62.6 °F | 83.5 °F | 4.15 in. |
| September | 54.0 °F | 77.6 °F | 3.41 in. |
| October | 41.9 °F | 64.3 °F | 2.95 in. |
| November | 30.1 °F | 48.9 °F | 2.21 in. |
| December | 19.6 °F | 35.6 °F | 1.67 in. |
| Annual | 40.5 °F | 60.5 °F | 37.27 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 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |