Halls Crossing, Utah has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 8.4 °C (low) to 22.9 °C (high). Annual precipitation averages 151.4 Millimeters. Halls Crossing is located in USDA Plant Hardiness Zone 8a. 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 | -3.3 °C | 8.3 °C | 16.51 mm |
| February | -1.1 °C | 12.1 °C | 15.24 mm |
| March | 3 °C | 17.8 °C | 13.46 mm |
| April | 6.7 °C | 22.3 °C | 8.38 mm |
| May | 12.3 °C | 28.1 °C | 7.62 mm |
| June | 17.9 °C | 34.7 °C | 4.06 mm |
| July | 22 °C | 37.9 °C | 10.16 mm |
| August | 20.8 °C | 35.9 °C | 14.22 mm |
| September | 15.6 °C | 31.3 °C | 20.32 mm |
| October | 8.2 °C | 23.3 °C | 20.57 mm |
| November | 1.4 °C | 14.8 °C | 9.65 mm |
| December | -3.2 °C | 8.2 °C | 11.18 mm |
| Annual | 8.4 °C | 22.9 °C | 151.37 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |