Circleville, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.7 °C (low) to 17.7 °C (high). Annual precipitation averages 243.1 Millimeters. Circleville is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.1 °C | 5.3 °C | 14.48 mm |
| February | -7.8 °C | 7.6 °C | 17.53 mm |
| March | -4.7 °C | 12.3 °C | 21.59 mm |
| April | -2 °C | 16.2 °C | 18.03 mm |
| May | 2.2 °C | 21.3 °C | 21.34 mm |
| June | 6.4 °C | 27.7 °C | 11.43 mm |
| July | 10.6 °C | 31 °C | 24.38 mm |
| August | 9.8 °C | 29.7 °C | 31.24 mm |
| September | 4.8 °C | 25.8 °C | 26.92 mm |
| October | -0.9 °C | 19.1 °C | 27.69 mm |
| November | -6.4 °C | 11.5 °C | 11.68 mm |
| December | -10.4 °C | 5.2 °C | 16.76 mm |
| Annual | -0.7 °C | 17.7 °C | 243.07 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |