Rome, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.9 °F (low) to 61.7 °F (high). Annual precipitation averages 37.9 Inches. Rome is located in USDA Plant Hardiness Zone 6a. 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 | 15.7 °F | 32.3 °F | 1.43 in. |
| February | 19.5 °F | 37.0 °F | 1.72 in. |
| March | 29.9 °F | 49.7 °F | 2.42 in. |
| April | 40.9 °F | 63.2 °F | 3.7 in. |
| May | 52.5 °F | 73.4 °F | 5.17 in. |
| June | 62.1 °F | 82.6 °F | 5.0 in. |
| July | 66.0 °F | 86.2 °F | 4.14 in. |
| August | 63.7 °F | 84.7 °F | 3.9 in. |
| September | 55.0 °F | 78.2 °F | 3.58 in. |
| October | 43.5 °F | 65.2 °F | 2.91 in. |
| November | 32.0 °F | 50.1 °F | 2.22 in. |
| December | 21.6 °F | 37.4 °F | 1.73 in. |
| Annual | 41.9 °F | 61.7 °F | 37.92 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 6a : -10°F to -5°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 |