Rossmore, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44.9 °F (low) to 67.7 °F (high). Annual precipitation averages 49.6 Inches. Rossmore 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.1 °F | 44.3 °F | 3.47 in. |
| February | 27.6 °F | 48.8 °F | 3.47 in. |
| March | 33.6 °F | 57.6 °F | 4.48 in. |
| April | 42.9 °F | 70.2 °F | 4.32 in. |
| May | 52.9 °F | 77.5 °F | 5.16 in. |
| June | 61.3 °F | 84.3 °F | 4.98 in. |
| July | 65.4 °F | 87.3 °F | 6.06 in. |
| August | 64.4 °F | 86.3 °F | 3.99 in. |
| September | 57.4 °F | 80.9 °F | 3.38 in. |
| October | 45.1 °F | 69.6 °F | 3.12 in. |
| November | 34.3 °F | 57.8 °F | 2.96 in. |
| December | 29.1 °F | 47.8 °F | 4.19 in. |
| Annual | 44.9 °F | 67.7 °F | 49.58 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |