Colo, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.3 °F (low) to 58.2 °F (high). Annual precipitation averages 37.2 Inches. 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 | 10.6 °F | 27.7 °F | 0.98 in. |
| February | 14.7 °F | 32.4 °F | 1.12 in. |
| March | 26.0 °F | 45.5 °F | 2.07 in. |
| April | 37.2 °F | 59.6 °F | 3.71 in. |
| May | 49.7 °F | 70.5 °F | 5.19 in. |
| June | 60.2 °F | 80.2 °F | 5.62 in. |
| July | 63.7 °F | 83.4 °F | 4.52 in. |
| August | 61.1 °F | 81.2 °F | 4.45 in. |
| September | 52.1 °F | 75.5 °F | 3.56 in. |
| October | 39.8 °F | 62.1 °F | 2.55 in. |
| November | 27.5 °F | 46.6 °F | 1.92 in. |
| December | 16.7 °F | 33.3 °F | 1.48 in. |
| Annual | 38.3 °F | 58.2 °F | 37.17 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 5b : -15°F to -10°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 |