Jeffersontown, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.6 °F (low) to 66.7 °F (high). Annual precipitation averages 50.4 Inches. Jeffersontown 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 | 25.3 °F | 42.3 °F | 3.73 in. |
| February | 27.8 °F | 46.8 °F | 3.66 in. |
| March | 35.5 °F | 56.5 °F | 4.71 in. |
| April | 45.5 °F | 67.8 °F | 4.97 in. |
| May | 55.7 °F | 76.1 °F | 5.31 in. |
| June | 63.9 °F | 83.9 °F | 4.92 in. |
| July | 67.5 °F | 87.1 °F | 4.36 in. |
| August | 66.1 °F | 86.5 °F | 3.43 in. |
| September | 58.9 °F | 80.9 °F | 3.58 in. |
| October | 47.1 °F | 69.7 °F | 3.72 in. |
| November | 36.5 °F | 56.6 °F | 3.69 in. |
| December | 29.4 °F | 46.0 °F | 4.35 in. |
| Annual | 46.6 °F | 66.7 °F | 50.43 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 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |