Richfield, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.8 °C (low) to 18.2 °C (high). Annual precipitation averages 215.6 Millimeters. Richfield is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9 °C | 4.7 °C | 12.7 mm |
| February | -6.4 °C | 7.8 °C | 13.72 mm |
| March | -3.2 °C | 13.1 °C | 19.3 mm |
| April | -0.4 °C | 16.8 °C | 18.54 mm |
| May | 3.8 °C | 22.1 °C | 26.92 mm |
| June | 8.2 °C | 28.5 °C | 11.68 mm |
| July | 12.4 °C | 32.3 °C | 18.03 mm |
| August | 11.6 °C | 31.2 °C | 18.8 mm |
| September | 6.3 °C | 26.7 °C | 20.57 mm |
| October | 0.2 °C | 19.3 °C | 24.89 mm |
| November | -5.1 °C | 11.3 °C | 13.72 mm |
| December | -9.3 °C | 4.7 °C | 16.76 mm |
| Annual | 0.8 °C | 18.2 °C | 215.63 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 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 |