Manson, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.1 °F (low) to 57.4 °F (high). Annual precipitation averages 33.8 Inches. Manson 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 | 8.9 °F | 26.4 °F | 0.83 in. |
| February | 13.0 °F | 30.7 °F | 1.04 in. |
| March | 25.0 °F | 44.5 °F | 1.96 in. |
| April | 35.9 °F | 58.9 °F | 3.64 in. |
| May | 48.6 °F | 70.1 °F | 4.83 in. |
| June | 59.7 °F | 80.2 °F | 5.19 in. |
| July | 63.0 °F | 83.1 °F | 3.81 in. |
| August | 60.3 °F | 80.7 °F | 4.29 in. |
| September | 51.2 °F | 75.0 °F | 3.01 in. |
| October | 38.8 °F | 62.0 °F | 2.44 in. |
| November | 26.1 °F | 45.4 °F | 1.52 in. |
| December | 15.1 °F | 31.7 °F | 1.28 in. |
| Annual | 37.1 °F | 57.4 °F | 33.84 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 |