Moulton, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.4 °F (low) to 60.7 °F (high). Annual precipitation averages 39.1 Inches. Moulton 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 | 14.2 °F | 32.0 °F | 1.21 in. |
| February | 17.9 °F | 36.7 °F | 1.55 in. |
| March | 28.5 °F | 49.5 °F | 2.27 in. |
| April | 39.4 °F | 61.8 °F | 3.89 in. |
| May | 51.0 °F | 71.4 °F | 5.48 in. |
| June | 60.9 °F | 80.9 °F | 5.34 in. |
| July | 64.9 °F | 85.0 °F | 4.54 in. |
| August | 62.6 °F | 83.7 °F | 4.21 in. |
| September | 53.9 °F | 76.6 °F | 3.88 in. |
| October | 41.9 °F | 64.0 °F | 2.93 in. |
| November | 29.8 °F | 49.5 °F | 2.2 in. |
| December | 19.9 °F | 37.0 °F | 1.56 in. |
| Annual | 40.4 °F | 60.7 °F | 39.06 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 |