Mountain Green, Utah has a Humid Continental Climate - Dry Warm Summer climate (Köppen classification: Dsa). Average annual temperatures range from 2.4 °C (low) to 16.1 °C (high). Annual precipitation averages 599.4 Millimeters. Mountain Green is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 1.9 °C | 67.56 mm |
| February | -6.1 °C | 4.8 °C | 56.13 mm |
| March | -1.7 °C | 10.5 °C | 61.98 mm |
| April | 1.5 °C | 14.6 °C | 69.34 mm |
| May | 5.9 °C | 20.1 °C | 66.8 mm |
| June | 9.7 °C | 26.2 °C | 35.81 mm |
| July | 14.2 °C | 31.5 °C | 16 mm |
| August | 13.3 °C | 30.7 °C | 22.35 mm |
| September | 8.2 °C | 25 °C | 39.12 mm |
| October | 2.1 °C | 17.1 °C | 52.58 mm |
| November | -3.1 °C | 8.9 °C | 49.78 mm |
| December | -7.6 °C | 2.2 °C | 61.98 mm |
| Annual | 2.4 °C | 16.1 °C | 599.43 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsa - Humid Continental Climate - Dry Warm Summer |