Harlan, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44.6 °F (low) to 67.1 °F (high). Annual precipitation averages 51.2 Inches. Harlan 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 | 25.4 °F | 45.3 °F | 4.28 in. |
| February | 27.8 °F | 49.2 °F | 4.4 in. |
| March | 33.9 °F | 58.4 °F | 4.86 in. |
| April | 42.6 °F | 68.8 °F | 4.76 in. |
| May | 52.5 °F | 76.1 °F | 4.54 in. |
| June | 60.5 °F | 82.2 °F | 4.35 in. |
| July | 64.6 °F | 84.8 °F | 5.06 in. |
| August | 63.4 °F | 84.4 °F | 4.08 in. |
| September | 57.0 °F | 79.5 °F | 3.51 in. |
| October | 44.4 °F | 69.4 °F | 2.97 in. |
| November | 33.9 °F | 58.4 °F | 3.6 in. |
| December | 29.2 °F | 48.8 °F | 4.83 in. |
| Annual | 44.6 °F | 67.1 °F | 51.24 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |