Simpsonville, Kentucky has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.2 °F (low) to 65.9 °F (high). Annual precipitation averages 50.4 Inches. Simpsonville is located in USDA Plant Hardiness Zone 6b. 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 | 23.8 °F | 41.3 °F | 3.68 in. |
| February | 26.5 °F | 45.7 °F | 3.72 in. |
| March | 33.9 °F | 55.3 °F | 4.66 in. |
| April | 44.0 °F | 66.4 °F | 4.87 in. |
| May | 54.5 °F | 75.0 °F | 5.39 in. |
| June | 62.4 °F | 84.0 °F | 4.99 in. |
| July | 66.1 °F | 87.0 °F | 4.52 in. |
| August | 64.7 °F | 85.7 °F | 3.45 in. |
| September | 57.6 °F | 80.0 °F | 3.52 in. |
| October | 45.7 °F | 69.1 °F | 3.65 in. |
| November | 35.1 °F | 55.7 °F | 3.61 in. |
| December | 28.1 °F | 45.0 °F | 4.3 in. |
| Annual | 45.2 °F | 65.9 °F | 50.36 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |