| 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 Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 71c - Knobs-Norman Upland |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 46151 - Martinsville, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 21 | 30 | 40 | 50 | 60 | 63 | 61 | 53 | 41 | 33 | 23 | 41 |
| Avg Max Temp (°F) | 35 | 41 | 51 | 63 | 73 | 81 | 85 | 84 | 78 | 66 | 52 | 40 | 62 |
| Avg Precip (In.) | 2.52 | 2.48 | 3.5 | 4.17 | 4.74 | 4 | 4.31 | 4.12 | 3.19 | 2.99 | 3.84 | 3.14 | 42.98 |