Bethlehem, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.6 °C (low) to 20.9 °C (high). Annual precipitation averages 1248.9 Millimeters. Bethlehem 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.8 °C | 9.7 °C | 105.16 mm |
| February | -0.7 °C | 11.9 °C | 87.63 mm |
| March | 3.1 °C | 16.1 °C | 108.71 mm |
| April | 7.8 °C | 21.3 °C | 112.01 mm |
| May | 13.1 °C | 25.2 °C | 104.39 mm |
| June | 17.6 °C | 29.1 °C | 119.89 mm |
| July | 19.7 °C | 30.8 °C | 110.24 mm |
| August | 18.8 °C | 30 °C | 114.55 mm |
| September | 15.4 °C | 26.9 °C | 100.58 mm |
| October | 8.6 °C | 21.8 °C | 87.12 mm |
| November | 2.7 °C | 16.1 °C | 90.17 mm |
| December | -0.6 °C | 11.3 °C | 108.46 mm |
| Annual | 8.6 °C | 20.9 °C | 1248.91 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |