Clarkson, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.1 °F (low) to 66.9 °F (high). Annual precipitation averages 51.2 Inches. Clarkson is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.5 °F | 42.9 °F | 3.63 in. |
| February | 27.0 °F | 47.5 °F | 3.94 in. |
| March | 34.2 °F | 56.7 °F | 4.9 in. |
| April | 43.8 °F | 67.7 °F | 4.96 in. |
| May | 54.1 °F | 76.4 °F | 5.44 in. |
| June | 62.3 °F | 84.0 °F | 4.64 in. |
| July | 66.1 °F | 87.1 °F | 4.63 in. |
| August | 63.8 °F | 86.2 °F | 3.48 in. |
| September | 56.7 °F | 80.8 °F | 3.55 in. |
| October | 45.3 °F | 70.1 °F | 3.92 in. |
| November | 34.5 °F | 57.0 °F | 3.66 in. |
| December | 28.7 °F | 46.7 °F | 4.45 in. |
| Annual | 45.1 °F | 66.9 °F | 51.2 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |