Kirk, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 2.4 °C (low) to 18.2 °C (high). Annual precipitation averages 448.8 Millimeters. Kirk is located in USDA Plant Hardiness Zone 5b. 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 | -8.8 °C | 6.1 °C | 9.91 mm |
| February | -7.8 °C | 7.1 °C | 10.16 mm |
| March | -3.6 °C | 12.8 °C | 20.07 mm |
| April | 0.7 °C | 16.8 °C | 46.48 mm |
| May | 6.6 °C | 22.1 °C | 66.04 mm |
| June | 12.4 °C | 28.7 °C | 71.37 mm |
| July | 15.6 °C | 31.7 °C | 76.2 mm |
| August | 14.4 °C | 30.4 °C | 63.5 mm |
| September | 9.4 °C | 26.6 °C | 32 mm |
| October | 2.1 °C | 18.8 °C | 30.48 mm |
| November | -4 °C | 11.6 °C | 12.19 mm |
| December | -8.4 °C | 6.2 °C | 10.41 mm |
| Annual | 2.4 °C | 18.2 °C | 448.81 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |