Petersburg, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.4 °F (low) to 70.8 °F (high). Annual precipitation averages 59.9 Inches. Petersburg is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.6 °F | 48.8 °F | 5.13 in. |
| February | 31.3 °F | 53.2 °F | 5.26 in. |
| March | 37.9 °F | 62.0 °F | 5.68 in. |
| April | 45.7 °F | 71.4 °F | 5.25 in. |
| May | 55.2 °F | 79.1 °F | 4.95 in. |
| June | 63.4 °F | 86.3 °F | 5.18 in. |
| July | 67.3 °F | 89.2 °F | 5.52 in. |
| August | 65.8 °F | 89.0 °F | 4.39 in. |
| September | 58.7 °F | 83.8 °F | 4.39 in. |
| October | 46.7 °F | 73.4 °F | 3.77 in. |
| November | 36.5 °F | 61.2 °F | 4.1 in. |
| December | 31.3 °F | 51.6 °F | 6.24 in. |
| Annual | 47.4 °F | 70.8 °F | 59.86 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |