Manning, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.2 °C (low) to 14.8 °C (high). Annual precipitation averages 857.5 Millimeters. 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 | -11.9 °C | -2 °C | 20.07 mm |
| February | -9.7 °C | 0.6 °C | 25.91 mm |
| March | -3.6 °C | 8.1 °C | 47.24 mm |
| April | 2.4 °C | 15.4 °C | 89.15 mm |
| May | 9.4 °C | 21.4 °C | 122.43 mm |
| June | 15.3 °C | 27 °C | 128.02 mm |
| July | 17.4 °C | 28.7 °C | 100.33 mm |
| August | 15.8 °C | 27.6 °C | 106.68 mm |
| September | 10.8 °C | 24.3 °C | 82.55 mm |
| October | 4.1 °C | 17.2 °C | 66.04 mm |
| November | -3.1 °C | 8.1 °C | 37.59 mm |
| December | -8.6 °C | 0.8 °C | 31.5 mm |
| Annual | 3.2 °C | 14.8 °C | 857.51 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |