Colby, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.8 °F (low) to 66 °F (high). Annual precipitation averages 20.7 Inches. Colby is located in USDA Plant Hardiness Zone 6a. 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 | 16.2 °F | 42.6 °F | 0.38 in. |
| February | 18.4 °F | 45.6 °F | 0.52 in. |
| March | 26.2 °F | 55.9 °F | 0.95 in. |
| April | 34.8 °F | 64.3 °F | 1.82 in. |
| May | 46.2 °F | 73.9 °F | 3.08 in. |
| June | 57.1 °F | 85.7 °F | 2.56 in. |
| July | 62.4 °F | 90.6 °F | 3.88 in. |
| August | 60.3 °F | 87.9 °F | 3.21 in. |
| September | 51.0 °F | 80.7 °F | 1.53 in. |
| October | 37.5 °F | 67.7 °F | 1.45 in. |
| November | 25.7 °F | 54.0 °F | 0.69 in. |
| December | 17.5 °F | 43.6 °F | 0.58 in. |
| Annual | 37.8 °F | 66 °F | 20.65 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |