Bethlehem, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51 °F (low) to 72.4 °F (high). Annual precipitation averages 52.6 Inches. Bethlehem is located in USDA Plant Hardiness Zone 8b. 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 | 33.1 °F | 53.3 °F | 4.93 in. |
| February | 35.5 °F | 56.9 °F | 4.6 in. |
| March | 41.6 °F | 65.0 °F | 4.82 in. |
| April | 49.2 °F | 73.1 °F | 4.1 in. |
| May | 58.0 °F | 80.1 °F | 3.69 in. |
| June | 65.9 °F | 86.6 °F | 4.86 in. |
| July | 69.3 °F | 89.6 °F | 4.68 in. |
| August | 68.6 °F | 88.2 °F | 4.46 in. |
| September | 62.7 °F | 83.0 °F | 4.23 in. |
| October | 51.4 °F | 73.8 °F | 3.79 in. |
| November | 40.7 °F | 63.8 °F | 3.97 in. |
| December | 35.5 °F | 55.5 °F | 4.44 in. |
| Annual | 51 °F | 72.4 °F | 52.57 in. |
| 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 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |