Brunswick, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 58.7 °F (low) to 77.4 °F (high). Annual precipitation averages 49.5 Inches. Brunswick is located in USDA Plant Hardiness Zone 9a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 41.4 °F | 62.3 °F | 3.57 in. |
| February | 44.1 °F | 65.2 °F | 3.17 in. |
| March | 49.8 °F | 70.9 °F | 3.69 in. |
| April | 57.3 °F | 77.1 °F | 2.94 in. |
| May | 65.2 °F | 83.7 °F | 2.79 in. |
| June | 71.6 °F | 88.5 °F | 6.3 in. |
| July | 74.0 °F | 91.4 °F | 5.04 in. |
| August | 73.7 °F | 89.9 °F | 6.67 in. |
| September | 70.4 °F | 85.8 °F | 6.3 in. |
| October | 61.1 °F | 78.9 °F | 4.5 in. |
| November | 51.0 °F | 70.8 °F | 1.94 in. |
| December | 44.7 °F | 64.6 °F | 2.61 in. |
| Annual | 58.7 °F | 77.4 °F | 49.52 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |