Salem, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.7 °F (low) to 68 °F (high). Annual precipitation averages 50.1 Inches. Salem is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.4 °F | 43.5 °F | 3.85 in. |
| February | 29.0 °F | 48.1 °F | 3.73 in. |
| March | 37.1 °F | 58.0 °F | 4.74 in. |
| April | 46.9 °F | 69.0 °F | 5.08 in. |
| May | 56.8 °F | 77.4 °F | 5.26 in. |
| June | 65.3 °F | 85.5 °F | 4.56 in. |
| July | 68.8 °F | 88.5 °F | 4.25 in. |
| August | 66.8 °F | 87.9 °F | 3.05 in. |
| September | 59.5 °F | 82.4 °F | 3.37 in. |
| October | 48.0 °F | 70.7 °F | 3.68 in. |
| November | 37.4 °F | 57.9 °F | 4.13 in. |
| December | 29.9 °F | 47.1 °F | 4.44 in. |
| Annual | 47.7 °F | 68 °F | 50.14 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |