Ephraim, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 31.9 °F (low) to 62.8 °F (high). Annual precipitation averages 11.7 Inches. Ephraim is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.0 °F | 36.9 °F | 0.94 in. |
| February | 18.4 °F | 42.4 °F | 0.99 in. |
| March | 25.6 °F | 53.0 °F | 1.14 in. |
| April | 30.4 °F | 59.8 °F | 1.13 in. |
| May | 37.6 °F | 69.8 °F | 1.25 in. |
| June | 45.2 °F | 81.9 °F | 0.7 in. |
| July | 52.6 °F | 89.5 °F | 0.61 in. |
| August | 51.0 °F | 87.5 °F | 0.81 in. |
| September | 42.0 °F | 78.8 °F | 1.07 in. |
| October | 31.3 °F | 65.3 °F | 1.08 in. |
| November | 21.7 °F | 50.6 °F | 0.87 in. |
| December | 13.5 °F | 37.5 °F | 1.11 in. |
| Annual | 31.9 °F | 62.8 °F | 11.7 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |