Mill Creek, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39 °F (low) to 61.5 °F (high). Annual precipitation averages 51.5 Inches. Mill Creek is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.2 °F | 38.8 °F | 3.63 in. |
| February | 21.1 °F | 42.2 °F | 3.31 in. |
| March | 27.6 °F | 50.7 °F | 4.34 in. |
| April | 37.1 °F | 62.8 °F | 4.31 in. |
| May | 46.8 °F | 70.8 °F | 5.43 in. |
| June | 55.2 °F | 77.5 °F | 5.52 in. |
| July | 59.4 °F | 80.8 °F | 5.88 in. |
| August | 57.9 °F | 79.9 °F | 4.29 in. |
| September | 51.1 °F | 74.9 °F | 3.8 in. |
| October | 39.0 °F | 64.4 °F | 3.89 in. |
| November | 29.4 °F | 52.6 °F | 3.17 in. |
| December | 23.8 °F | 42.9 °F | 3.95 in. |
| Annual | 39 °F | 61.5 °F | 51.52 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |