| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55b - Loamy High Lime Till Plains |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 43113 - Circleville, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 22 | 31 | 40 | 50 | 59 | 63 | 61 | 54 | 42 | 34 | 25 | 42 |
| Avg Max Temp (°F) | 36 | 41 | 52 | 63 | 73 | 81 | 85 | 83 | 77 | 66 | 53 | 41 | 63 |
| Avg Precip (In.) | 2.43 | 2.24 | 2.87 | 3.43 | 4.58 | 3.89 | 3.94 | 3.91 | 3.01 | 2.61 | 3.07 | 2.74 | 38.73 |