Haswell, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 35.6 °F (low) to 67.6 °F (high). Annual precipitation averages 14.4 Inches. Haswell 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 | 14.2 °F | 45.7 °F | 0.28 in. |
| February | 17.1 °F | 48.2 °F | 0.31 in. |
| March | 25.2 °F | 58.4 °F | 0.81 in. |
| April | 33.0 °F | 65.3 °F | 1.25 in. |
| May | 44.1 °F | 75.4 °F | 1.98 in. |
| June | 54.3 °F | 86.6 °F | 1.85 in. |
| July | 59.7 °F | 91.6 °F | 2.67 in. |
| August | 58.2 °F | 88.9 °F | 2.61 in. |
| September | 48.7 °F | 81.6 °F | 0.88 in. |
| October | 34.8 °F | 68.7 °F | 0.98 in. |
| November | 22.9 °F | 55.5 °F | 0.44 in. |
| December | 14.7 °F | 45.5 °F | 0.33 in. |
| Annual | 35.6 °F | 67.6 °F | 14.39 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |