Kellerton, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.6 °F (low) to 60 °F (high). Annual precipitation averages 38.6 Inches. Kellerton 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 | 13.0 °F | 31.3 °F | 0.95 in. |
| February | 17.0 °F | 36.2 °F | 1.38 in. |
| March | 27.6 °F | 48.9 °F | 2.26 in. |
| April | 38.6 °F | 60.6 °F | 4.0 in. |
| May | 50.3 °F | 70.7 °F | 5.29 in. |
| June | 60.4 °F | 80.2 °F | 5.27 in. |
| July | 64.6 °F | 84.5 °F | 4.57 in. |
| August | 62.2 °F | 83.1 °F | 4.37 in. |
| September | 53.1 °F | 75.7 °F | 3.88 in. |
| October | 40.9 °F | 63.5 °F | 3.01 in. |
| November | 28.9 °F | 48.7 °F | 2.09 in. |
| December | 18.5 °F | 36.2 °F | 1.48 in. |
| Annual | 39.6 °F | 60 °F | 38.55 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 |