Green River, Utah has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 38 °F (low) to 69.5 °F (high). Annual precipitation averages 7.4 Inches. Green River is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.2 °F | 39.2 °F | 0.53 in. |
| February | 22.6 °F | 49.5 °F | 0.55 in. |
| March | 30.0 °F | 61.6 °F | 0.51 in. |
| April | 37.5 °F | 69.4 °F | 0.6 in. |
| May | 46.9 °F | 78.8 °F | 0.63 in. |
| June | 55.1 °F | 90.5 °F | 0.43 in. |
| July | 62.7 °F | 97.0 °F | 0.69 in. |
| August | 59.8 °F | 93.9 °F | 0.76 in. |
| September | 49.1 °F | 85.6 °F | 0.92 in. |
| October | 36.6 °F | 71.2 °F | 0.76 in. |
| November | 24.3 °F | 55.2 °F | 0.38 in. |
| December | 16.4 °F | 41.6 °F | 0.59 in. |
| Annual | 38 °F | 69.5 °F | 7.35 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |