Riverton, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 4.5 °C (low) to 18.1 °C (high). Annual precipitation averages 418.3 Millimeters. Riverton is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.7 °C | 4.1 °C | 36.32 mm |
| February | -3.6 °C | 6.9 °C | 36.32 mm |
| March | 0.3 °C | 12.7 °C | 43.69 mm |
| April | 3 °C | 16.5 °C | 54.36 mm |
| May | 7.6 °C | 22.1 °C | 49.53 mm |
| June | 11.8 °C | 28.5 °C | 24.89 mm |
| July | 16.8 °C | 33.8 °C | 17.78 mm |
| August | 16.1 °C | 32.8 °C | 21.34 mm |
| September | 10.6 °C | 26.8 °C | 29.46 mm |
| October | 4.1 °C | 18.9 °C | 36.83 mm |
| November | -1.2 °C | 10.3 °C | 33.27 mm |
| December | -5.5 °C | 4.2 °C | 34.54 mm |
| Annual | 4.5 °C | 18.1 °C | 418.33 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |