Butner, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.7 °C (low) to 21.5 °C (high). Annual precipitation averages 1175 Millimeters. Butner is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.9 °C | 10.3 °C | 91.95 mm |
| February | -0.9 °C | 12.2 °C | 75.69 mm |
| March | 2.6 °C | 16.6 °C | 108.46 mm |
| April | 7.8 °C | 22.2 °C | 94.49 mm |
| May | 12.9 °C | 25.9 °C | 94.49 mm |
| June | 18 °C | 29.9 °C | 100.33 mm |
| July | 20.1 °C | 31.9 °C | 119.63 mm |
| August | 19.3 °C | 30.9 °C | 103.89 mm |
| September | 15.8 °C | 27.6 °C | 124.97 mm |
| October | 8.7 °C | 22 °C | 92.46 mm |
| November | 2.6 °C | 16.5 °C | 82.04 mm |
| December | -0.4 °C | 11.8 °C | 86.61 mm |
| Annual | 8.7 °C | 21.5 °C | 1175.01 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |