Cumming, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.7 °F (low) to 60.1 °F (high). Annual precipitation averages 35.9 Inches. Cumming 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 | 12.5 °F | 30.4 °F | 1.0 in. |
| February | 16.4 °F | 35.1 °F | 1.23 in. |
| March | 27.5 °F | 48.1 °F | 2.07 in. |
| April | 38.8 °F | 61.4 °F | 3.69 in. |
| May | 50.8 °F | 71.6 °F | 5.06 in. |
| June | 61.0 °F | 81.2 °F | 5.2 in. |
| July | 65.0 °F | 85.2 °F | 4.18 in. |
| August | 62.4 °F | 83.5 °F | 4.12 in. |
| September | 53.5 °F | 76.9 °F | 3.45 in. |
| October | 41.2 °F | 63.9 °F | 2.62 in. |
| November | 28.9 °F | 48.6 °F | 1.82 in. |
| December | 18.3 °F | 35.5 °F | 1.43 in. |
| Annual | 39.7 °F | 60.1 °F | 35.87 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 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |