Corwith, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.3 °F (low) to 56.2 °F (high). Annual precipitation averages 34.1 Inches. Corwith 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 | 7.7 °F | 24.8 °F | 0.82 in. |
| February | 12.0 °F | 29.2 °F | 0.98 in. |
| March | 24.1 °F | 42.1 °F | 2.05 in. |
| April | 35.5 °F | 57.5 °F | 3.81 in. |
| May | 48.0 °F | 69.4 °F | 4.8 in. |
| June | 58.9 °F | 79.4 °F | 5.31 in. |
| July | 62.2 °F | 82.3 °F | 4.15 in. |
| August | 59.3 °F | 80.0 °F | 3.99 in. |
| September | 50.5 °F | 74.1 °F | 3.02 in. |
| October | 37.9 °F | 60.8 °F | 2.3 in. |
| November | 25.5 °F | 44.2 °F | 1.63 in. |
| December | 14.2 °F | 30.2 °F | 1.27 in. |
| Annual | 36.3 °F | 56.2 °F | 34.13 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |