Fairfield, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.8 °C (low) to 17.5 °C (high). Annual precipitation averages 304.8 Millimeters. 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 | -8.3 °C | 3.6 °C | 29.72 mm |
| February | -6.1 °C | 6.6 °C | 32 mm |
| March | -1.9 °C | 12.1 °C | 29.72 mm |
| April | 0.8 °C | 16.2 °C | 31.5 mm |
| May | 4.7 °C | 21.1 °C | 30.48 mm |
| June | 8.5 °C | 27.6 °C | 17.78 mm |
| July | 13.2 °C | 32.2 °C | 17.78 mm |
| August | 13.1 °C | 31.5 °C | 18.54 mm |
| September | 7.8 °C | 26.2 °C | 21.08 mm |
| October | 1.4 °C | 18.3 °C | 27.43 mm |
| November | -3.6 °C | 10.5 °C | 21.08 mm |
| December | -7.9 °C | 4 °C | 27.69 mm |
| Annual | 1.8 °C | 17.5 °C | 304.8 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |