| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 72c - Green River-Southern Wabash Lowlands |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 47567 - Petersburg, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 25 | 34 | 43 | 53 | 63 | 66 | 64 | 57 | 45 | 36 | 26 | 44 |
| Avg Max Temp (°F) | 38 | 44 | 55 | 66 | 76 | 84 | 88 | 86 | 80 | 69 | 55 | 43 | 65 |
| Avg Precip (In.) | 2.92 | 2.74 | 4.1 | 4.25 | 5.15 | 3.91 | 4.18 | 3.76 | 2.99 | 2.9 | 4.41 | 3.42 | 44.73 |