Colo, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.5 °C (low) to 14.5 °C (high). Annual precipitation averages 944.1 Millimeters. Colo is located in USDA Plant Hardiness Zone 5b. 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 | -2.4 °C | 24.89 mm |
| February | -9.6 °C | 0.2 °C | 28.45 mm |
| March | -3.3 °C | 7.5 °C | 52.58 mm |
| April | 2.9 °C | 15.3 °C | 94.23 mm |
| May | 9.8 °C | 21.4 °C | 131.83 mm |
| June | 15.7 °C | 26.8 °C | 142.75 mm |
| July | 17.6 °C | 28.6 °C | 114.81 mm |
| August | 16.2 °C | 27.3 °C | 113.03 mm |
| September | 11.2 °C | 24.2 °C | 90.42 mm |
| October | 4.3 °C | 16.7 °C | 64.77 mm |
| November | -2.5 °C | 8.1 °C | 48.77 mm |
| December | -8.5 °C | 0.7 °C | 37.59 mm |
| Annual | 3.5 °C | 14.5 °C | 944.12 mm |
| 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 5b : -26.1°C to -23.3°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 |