Unionville, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.2 °F (low) to 72.2 °F (high). Annual precipitation averages 45.7 Inches. Unionville is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.3 °F | 52.6 °F | 3.74 in. |
| February | 33.9 °F | 56.4 °F | 3.12 in. |
| March | 40.5 °F | 63.9 °F | 4.21 in. |
| April | 49.0 °F | 73.1 °F | 3.68 in. |
| May | 57.9 °F | 80.1 °F | 3.27 in. |
| June | 66.1 °F | 86.9 °F | 4.32 in. |
| July | 69.6 °F | 90.2 °F | 4.07 in. |
| August | 68.3 °F | 88.3 °F | 4.42 in. |
| September | 62.4 °F | 82.9 °F | 4.49 in. |
| October | 50.3 °F | 73.5 °F | 3.55 in. |
| November | 39.6 °F | 63.4 °F | 3.2 in. |
| December | 34.0 °F | 55.2 °F | 3.63 in. |
| Annual | 50.2 °F | 72.2 °F | 45.7 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |