Palmer, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.3 °F (low) to 66.5 °F (high). Annual precipitation averages 65.8 Inches. Palmer is located in USDA Plant Hardiness Zone 7a. 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 | 26.3 °F | 45.5 °F | 5.54 in. |
| February | 29.3 °F | 49.4 °F | 5.75 in. |
| March | 35.9 °F | 57.9 °F | 6.31 in. |
| April | 44.0 °F | 67.5 °F | 6.31 in. |
| May | 53.0 °F | 74.7 °F | 5.31 in. |
| June | 60.5 °F | 81.1 °F | 5.69 in. |
| July | 63.9 °F | 84.2 °F | 6.06 in. |
| August | 62.7 °F | 83.9 °F | 4.67 in. |
| September | 56.7 °F | 79.1 °F | 4.58 in. |
| October | 45.5 °F | 68.9 °F | 3.79 in. |
| November | 35.8 °F | 57.7 °F | 4.86 in. |
| December | 29.9 °F | 48.3 °F | 6.92 in. |
| Annual | 45.3 °F | 66.5 °F | 65.79 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |