| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 63°F | 51°F | 7.1" |
| February | 42°F | 66°F | 53°F | 6.3" |
| March | 49°F | 72°F | 60°F | 7.9" |
| April | 56°F | 79°F | 67°F | 7.4" |
| May | 64°F | 85°F | 74°F | 7.2" |
| June | 71°F | 91°F | 80°F | 9.3" |
| July | 74°F | 92°F | 82°F | 9.2" |
| August | 74°F | 91°F | 81°F | 11.3" |
| September | 69°F | 87°F | 77°F | 9.3" |
| October | 59°F | 80°F | 68°F | 8.4" |
| November | 48°F | 71°F | 58°F | 4.8" |
| December | 45°F | 67°F | 55°F | 7.5" |
| Index | Wilmington Island | Georgia | National |
| Air quality index | 39 | 41 | 42 |
| Pollution index | 1,428,370 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 295 |
| Days with moderate air quality | 70 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Garden City, GA | 8,957 | 39 | 22.0% |
| Port Wentworth, GA | 8,886 | 39 | 22.0% |
| Thunderbolt, GA | 2,638 | 39 | 22.0% |
| Hilton Head Island, SC | 40,000 | 39 | 22.0% |
| Georgetown, GA | 12,545 | 39 | 22.0% |
| Wilmington Island, GA | 15,607 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Lakeway, TX | 15,605 | 44 | 12.0% |
| Mastic Beach, NY | 15,610 | 43 | 14.0% |
| Hermitage, PA | 15,603 | 42 | 16.0% |
| Mitchell, SD | 15,599 | 36 | 28.0% |
| Brooks, AB | 15,617 | n/a | |
| Wilmington Island, GA | 15,607 | 39 | 22.0% |
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