Fort Duchesne, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 32.4 °F (low) to 62.4 °F (high). Annual precipitation averages 6.3 Inches. Fort Duchesne 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.3 °F | 29.6 °F | 0.35 in. |
| February | 13.9 °F | 38.8 °F | 0.34 in. |
| March | 25.3 °F | 54.1 °F | 0.43 in. |
| April | 32.5 °F | 63.3 °F | 0.45 in. |
| May | 41.4 °F | 72.8 °F | 0.67 in. |
| June | 49.1 °F | 84.7 °F | 0.51 in. |
| July | 56.0 °F | 91.7 °F | 0.39 in. |
| August | 53.9 °F | 88.9 °F | 0.62 in. |
| September | 45.1 °F | 79.7 °F | 0.98 in. |
| October | 33.2 °F | 64.5 °F | 0.82 in. |
| November | 22.1 °F | 47.8 °F | 0.32 in. |
| December | 10.5 °F | 32.7 °F | 0.46 in. |
| Annual | 32.4 °F | 62.4 °F | 6.34 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |