Mount Washington, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.1 °F (low) to 66.9 °F (high). Annual precipitation averages 50.3 Inches. Mount Washington 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 | 24.9 °F | 42.5 °F | 3.6 in. |
| February | 27.8 °F | 47.0 °F | 3.73 in. |
| March | 35.2 °F | 56.6 °F | 4.69 in. |
| April | 45.0 °F | 67.8 °F | 4.9 in. |
| May | 55.2 °F | 76.3 °F | 5.35 in. |
| June | 63.2 °F | 84.4 °F | 4.97 in. |
| July | 66.8 °F | 87.3 °F | 4.28 in. |
| August | 65.4 °F | 86.7 °F | 3.41 in. |
| September | 58.3 °F | 81.1 °F | 3.53 in. |
| October | 46.6 °F | 69.8 °F | 3.81 in. |
| November | 36.2 °F | 56.7 °F | 3.63 in. |
| December | 29.1 °F | 46.1 °F | 4.35 in. |
| Annual | 46.1 °F | 66.9 °F | 50.25 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |