Manning, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.8 °F (low) to 58.6 °F (high). Annual precipitation averages 33.8 Inches. Manning is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.6 °F | 28.4 °F | 0.79 in. |
| February | 14.6 °F | 33.0 °F | 1.02 in. |
| March | 25.6 °F | 46.5 °F | 1.86 in. |
| April | 36.3 °F | 59.8 °F | 3.51 in. |
| May | 48.9 °F | 70.6 °F | 4.82 in. |
| June | 59.6 °F | 80.6 °F | 5.04 in. |
| July | 63.3 °F | 83.7 °F | 3.95 in. |
| August | 60.5 °F | 81.6 °F | 4.2 in. |
| September | 51.4 °F | 75.7 °F | 3.25 in. |
| October | 39.4 °F | 62.9 °F | 2.6 in. |
| November | 26.5 °F | 46.5 °F | 1.48 in. |
| December | 16.5 °F | 33.4 °F | 1.24 in. |
| Annual | 37.8 °F | 58.6 °F | 33.76 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |