Millersburg, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 43.7 °F (low) to 65.5 °F (high). Annual precipitation averages 48.5 Inches. Millersburg 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 | 22.9 °F | 41.0 °F | 3.42 in. |
| February | 25.7 °F | 45.4 °F | 3.56 in. |
| March | 32.4 °F | 54.5 °F | 4.63 in. |
| April | 42.4 °F | 65.7 °F | 4.5 in. |
| May | 52.7 °F | 75.0 °F | 5.22 in. |
| June | 60.9 °F | 83.0 °F | 4.93 in. |
| July | 65.0 °F | 86.5 °F | 4.92 in. |
| August | 62.8 °F | 85.6 °F | 3.3 in. |
| September | 55.6 °F | 80.2 °F | 3.44 in. |
| October | 43.9 °F | 68.6 °F | 3.31 in. |
| November | 33.2 °F | 55.2 °F | 3.26 in. |
| December | 27.2 °F | 45.1 °F | 4.0 in. |
| Annual | 43.7 °F | 65.5 °F | 48.49 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 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |