| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| 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: | 71d - Outer Bluegrass |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 45030 - Harrison, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 23 | 32 | 40 | 50 | 59 | 63 | 62 | 54 | 42 | 34 | 25 | 42 |
| Avg Max Temp (°F) | 38 | 43 | 54 | 65 | 75 | 83 | 86 | 85 | 79 | 67 | 54 | 43 | 64 |
| Avg Precip (In.) | 3.03 | 2.7 | 3.86 | 4.01 | 4.88 | 4.22 | 4.16 | 3.79 | 2.9 | 2.99 | 3.56 | 3.3 | 43.39 |