Chapel Hill, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.3 °C (low) to 21.4 °C (high). Annual precipitation averages 1197.1 Millimeters. Chapel Hill 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 | -1.2 °C | 10.3 °C | 95.25 mm |
| February | -0.2 °C | 12.2 °C | 77.47 mm |
| March | 3.4 °C | 16.6 °C | 109.73 mm |
| April | 8.4 °C | 21.9 °C | 92.46 mm |
| May | 13.6 °C | 25.8 °C | 91.95 mm |
| June | 18.2 °C | 29.8 °C | 104.14 mm |
| July | 20.5 °C | 31.6 °C | 121.67 mm |
| August | 19.7 °C | 30.7 °C | 107.19 mm |
| September | 16.4 °C | 27.5 °C | 128.52 mm |
| October | 9.4 °C | 22.1 °C | 89.92 mm |
| November | 3.4 °C | 16.5 °C | 84.84 mm |
| December | 0.5 °C | 11.9 °C | 93.98 mm |
| Annual | 9.3 °C | 21.4 °C | 1197.12 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |