Fairfield, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 35.2 °F (low) to 63.5 °F (high). Annual precipitation averages 12 Inches. Fairfield is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.0 °F | 38.4 °F | 1.17 in. |
| February | 21.1 °F | 43.8 °F | 1.26 in. |
| March | 28.5 °F | 53.8 °F | 1.17 in. |
| April | 33.4 °F | 61.1 °F | 1.24 in. |
| May | 40.4 °F | 69.9 °F | 1.2 in. |
| June | 47.3 °F | 81.6 °F | 0.7 in. |
| July | 55.7 °F | 90.0 °F | 0.7 in. |
| August | 55.6 °F | 88.7 °F | 0.73 in. |
| September | 46.0 °F | 79.1 °F | 0.83 in. |
| October | 34.5 °F | 64.9 °F | 1.08 in. |
| November | 25.6 °F | 50.9 °F | 0.83 in. |
| December | 17.8 °F | 39.2 °F | 1.09 in. |
| Annual | 35.2 °F | 63.5 °F | 12 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |