New Castle, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44.9 °F (low) to 66.8 °F (high). Annual precipitation averages 40.8 Inches. New Castle is located in USDA Plant Hardiness Zone 7b. 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 | 25.9 °F | 44.9 °F | 3.14 in. |
| February | 27.9 °F | 48.7 °F | 2.52 in. |
| March | 34.3 °F | 57.1 °F | 3.31 in. |
| April | 43.3 °F | 68.5 °F | 3.45 in. |
| May | 52.7 °F | 75.8 °F | 4.69 in. |
| June | 60.3 °F | 82.7 °F | 4.28 in. |
| July | 64.9 °F | 86.2 °F | 3.91 in. |
| August | 63.7 °F | 84.7 °F | 3.04 in. |
| September | 57.2 °F | 78.7 °F | 3.28 in. |
| October | 45.3 °F | 68.7 °F | 2.82 in. |
| November | 34.8 °F | 57.7 °F | 2.81 in. |
| December | 29.0 °F | 48.1 °F | 3.53 in. |
| Annual | 44.9 °F | 66.8 °F | 40.78 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |