| 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: | 55b - Loamy High Lime Till Plains |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 45146 - Martinsville, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 21 | 30 | 39 | 50 | 59 | 63 | 60 | 53 | 42 | 33 | 24 | 41 |
| Avg Max Temp (°F) | 35 | 40 | 51 | 62 | 72 | 80 | 84 | 83 | 76 | 65 | 52 | 40 | 62 |
| Avg Precip (In.) | 2.83 | 2.58 | 3.54 | 3.96 | 4.82 | 4.21 | 4.12 | 3.75 | 3.04 | 2.84 | 3.35 | 3 | 42.05 |