| 2023 Hardiness Zone: | 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: | 55d - Pre-Wisconsinan Drift Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 45133 - Hillsboro, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 23 | 31 | 42 | 52 | 61 | 65 | 63 | 56 | 44 | 35 | 25 | 43 |
| Avg Max Temp (°F) | 35 | 40 | 51 | 62 | 71 | 79 | 83 | 82 | 76 | 64 | 52 | 41 | 61 |
| Avg Precip (In.) | 2.99 | 2.77 | 3.77 | 3.98 | 4.76 | 4.25 | 4.13 | 4.18 | 3.35 | 2.84 | 3.22 | 3.1 | 43.33 |