Circleville, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 18.2 °C (high). Annual precipitation averages 913.6 Millimeters. Circleville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 3.1 °C | 19.05 mm |
| February | -5.9 °C | 5.9 °C | 29.46 mm |
| March | -0.4 °C | 12.5 °C | 55.88 mm |
| April | 5.3 °C | 18.5 °C | 92.71 mm |
| May | 11.9 °C | 23.8 °C | 133.86 mm |
| June | 17.6 °C | 28.9 °C | 125.98 mm |
| July | 19.7 °C | 31.3 °C | 115.32 mm |
| August | 18.4 °C | 30.7 °C | 104.14 mm |
| September | 13.3 °C | 26.6 °C | 89.41 mm |
| October | 6.4 °C | 20 °C | 72.64 mm |
| November | -0.1 °C | 12 °C | 43.69 mm |
| December | -5.4 °C | 5.1 °C | 31.5 mm |
| Annual | 6.1 °C | 18.2 °C | 913.64 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |