Powell, Wyoming has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 32.3 °F (low) to 59.1 °F (high). Annual precipitation averages 7.1 Inches. Powell is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.3 °F | 33.8 °F | 0.19 in. |
| February | 13.8 °F | 37.8 °F | 0.2 in. |
| March | 23.4 °F | 49.8 °F | 0.26 in. |
| April | 31.4 °F | 58.1 °F | 0.6 in. |
| May | 41.2 °F | 67.2 °F | 1.36 in. |
| June | 49.3 °F | 77.6 °F | 1.27 in. |
| July | 55.4 °F | 86.6 °F | 0.96 in. |
| August | 53.0 °F | 85.2 °F | 0.39 in. |
| September | 43.9 °F | 74.6 °F | 0.85 in. |
| October | 32.3 °F | 59.3 °F | 0.64 in. |
| November | 21.0 °F | 44.7 °F | 0.2 in. |
| December | 12.2 °F | 34.3 °F | 0.14 in. |
| Annual | 32.3 °F | 59.1 °F | 7.06 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |