Bethlehem, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.5 °F (low) to 69.5 °F (high). Annual precipitation averages 49.2 Inches. 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 | 28.7 °F | 49.4 °F | 4.14 in. |
| February | 30.8 °F | 53.4 °F | 3.45 in. |
| March | 37.5 °F | 60.9 °F | 4.28 in. |
| April | 46.1 °F | 70.3 °F | 4.41 in. |
| May | 55.5 °F | 77.3 °F | 4.11 in. |
| June | 63.6 °F | 84.4 °F | 4.72 in. |
| July | 67.4 °F | 87.5 °F | 4.34 in. |
| August | 65.9 °F | 86.0 °F | 4.51 in. |
| September | 59.7 °F | 80.5 °F | 3.96 in. |
| October | 47.4 °F | 71.2 °F | 3.43 in. |
| November | 36.8 °F | 60.9 °F | 3.55 in. |
| December | 30.9 °F | 52.3 °F | 4.27 in. |
| Annual | 47.5 °F | 69.5 °F | 49.17 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |