Colwell, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.2 °C (low) to 13.1 °C (high). Annual precipitation averages 956.6 Millimeters. Colwell is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.6 °C | -4.3 °C | 25.15 mm |
| February | -11.4 °C | -1.9 °C | 28.19 mm |
| March | -4.8 °C | 5.2 °C | 48.77 mm |
| April | 1.8 °C | 13.9 °C | 96.77 mm |
| May | 8.6 °C | 20.6 °C | 129.03 mm |
| June | 14.5 °C | 25.9 °C | 156.21 mm |
| July | 16.3 °C | 27.6 °C | 119.63 mm |
| August | 14.8 °C | 26.4 °C | 107.95 mm |
| September | 10.2 °C | 23.1 °C | 95 mm |
| October | 3.2 °C | 15.7 °C | 69.85 mm |
| November | -3.5 °C | 6.3 °C | 44.45 mm |
| December | -9.8 °C | -1.2 °C | 35.56 mm |
| Annual | 2.2 °C | 13.1 °C | 956.56 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |