Fort Duchesne, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.3 °C (low) to 16.9 °C (high). Annual precipitation averages 161 Millimeters. 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 | -14.3 °C | -1.3 °C | 8.89 mm |
| February | -10.1 °C | 3.8 °C | 8.64 mm |
| March | -3.7 °C | 12.3 °C | 10.92 mm |
| April | 0.3 °C | 17.4 °C | 11.43 mm |
| May | 5.2 °C | 22.7 °C | 17.02 mm |
| June | 9.5 °C | 29.3 °C | 12.95 mm |
| July | 13.3 °C | 33.2 °C | 9.91 mm |
| August | 12.2 °C | 31.6 °C | 15.75 mm |
| September | 7.3 °C | 26.5 °C | 24.89 mm |
| October | 0.7 °C | 18.1 °C | 20.83 mm |
| November | -5.5 °C | 8.8 °C | 8.13 mm |
| December | -11.9 °C | 0.4 °C | 11.68 mm |
| Annual | 0.3 °C | 16.9 °C | 161.04 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |