Howell, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 35.3 °F (low) to 60.7 °F (high). Annual precipitation averages 13.4 Inches. Howell 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 | 15.9 °F | 33.6 °F | 1.41 in. |
| February | 19.6 °F | 38.3 °F | 1.07 in. |
| March | 28.1 °F | 49.5 °F | 1.26 in. |
| April | 33.4 °F | 58.3 °F | 1.32 in. |
| May | 41.6 °F | 68.1 °F | 1.91 in. |
| June | 48.9 °F | 79.9 °F | 0.84 in. |
| July | 57.4 °F | 90.6 °F | 0.54 in. |
| August | 55.6 °F | 89.1 °F | 0.63 in. |
| September | 46.1 °F | 77.9 °F | 0.93 in. |
| October | 34.6 °F | 62.3 °F | 1.37 in. |
| November | 24.9 °F | 46.3 °F | 0.93 in. |
| December | 17.1 °F | 34.7 °F | 1.17 in. |
| Annual | 35.3 °F | 60.7 °F | 13.38 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |