Green River, Utah has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 3.4 °C (low) to 20.8 °C (high). Annual precipitation averages 186.7 Millimeters. 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 | -9.3 °C | 4 °C | 13.46 mm |
| February | -5.2 °C | 9.7 °C | 13.97 mm |
| March | -1.1 °C | 16.4 °C | 12.95 mm |
| April | 3.1 °C | 20.8 °C | 15.24 mm |
| May | 8.3 °C | 26 °C | 16 mm |
| June | 12.8 °C | 32.5 °C | 10.92 mm |
| July | 17.1 °C | 36.1 °C | 17.53 mm |
| August | 15.4 °C | 34.4 °C | 19.3 mm |
| September | 9.5 °C | 29.8 °C | 23.37 mm |
| October | 2.6 °C | 21.8 °C | 19.3 mm |
| November | -4.3 °C | 12.9 °C | 9.65 mm |
| December | -8.7 °C | 5.3 °C | 14.99 mm |
| Annual | 3.4 °C | 20.8 °C | 186.68 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |