Jefferson, North Carolina has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 5.2 °C (low) to 16.9 °C (high). Annual precipitation averages 1389.6 Millimeters. Jefferson is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.7 °C | 5.8 °C | 108.46 mm |
| February | -3.3 °C | 7.6 °C | 90.42 mm |
| March | -0.3 °C | 11.5 °C | 115.57 mm |
| April | 4.2 °C | 17.1 °C | 131.57 mm |
| May | 9.2 °C | 21.3 °C | 128.78 mm |
| June | 13.4 °C | 25.1 °C | 130.05 mm |
| July | 15.7 °C | 26.7 °C | 130.05 mm |
| August | 15 °C | 26.1 °C | 127.76 mm |
| September | 11.5 °C | 23.2 °C | 119.63 mm |
| October | 5.4 °C | 18.1 °C | 99.31 mm |
| November | -0.5 °C | 12.4 °C | 100.58 mm |
| December | -2.8 °C | 7.9 °C | 107.44 mm |
| Annual | 5.2 °C | 16.9 °C | 1389.62 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfb - Temperate Oceanic Climate |