Eureka, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 22.4 °C (high). Annual precipitation averages 1281.4 Millimeters. Eureka is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.1 °C | 11.6 °C | 92.46 mm |
| February | 0.8 °C | 13.5 °C | 76.45 mm |
| March | 4.3 °C | 17.5 °C | 99.82 mm |
| April | 9.6 °C | 22.8 °C | 92.2 mm |
| May | 14.6 °C | 26.8 °C | 100.84 mm |
| June | 19.3 °C | 30.7 °C | 116.59 mm |
| July | 21.5 °C | 32.4 °C | 141.22 mm |
| August | 20.4 °C | 31.2 °C | 141.48 mm |
| September | 17.3 °C | 28.3 °C | 162.05 mm |
| October | 10.5 °C | 23.3 °C | 86.87 mm |
| November | 4.6 °C | 17.8 °C | 84.07 mm |
| December | 1.6 °C | 13.3 °C | 87.38 mm |
| Annual | 10.4 °C | 22.4 °C | 1281.43 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |