Colman, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.2 °F (low) to 54.9 °F (high). Annual precipitation averages 27.4 Inches. Colman is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.7 °F | 23.6 °F | 0.58 in. |
| February | 9.6 °F | 28.4 °F | 0.8 in. |
| March | 20.9 °F | 40.7 °F | 1.34 in. |
| April | 33.1 °F | 55.4 °F | 2.85 in. |
| May | 45.9 °F | 67.8 °F | 3.66 in. |
| June | 56.9 °F | 77.8 °F | 4.28 in. |
| July | 60.8 °F | 82.3 °F | 3.4 in. |
| August | 58.2 °F | 79.7 °F | 3.35 in. |
| September | 49.4 °F | 72.9 °F | 3.05 in. |
| October | 36.0 °F | 59.0 °F | 2.12 in. |
| November | 22.5 °F | 42.2 °F | 1.08 in. |
| December | 11.4 °F | 28.5 °F | 0.89 in. |
| Annual | 34.2 °F | 54.9 °F | 27.4 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |