| 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 | Whitemarsh 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. |
| Henderson, GA | 2,694 | 39 | 22.0% |
| Port Wentworth, GA | 8,886 | 39 | 22.0% |
| Thunderbolt, GA | 2,638 | 39 | 22.0% |
| Bluffton, SC | 23,176 | 39 | 22.0% |
| Dutch Island, GA | 1,338 | 39 | 22.0% |
| Whitemarsh Island, GA | 7,264 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Williston Park, NY | 7,266 | 51 | 2.0% |
| Calipatria, CA | 7,260 | 58 | 16.0% |
| McNab/Braeside, ON | 7,260 | n/a | |
| Valley Falls, SC | 7,269 | 44 | 12.0% |
| Digby, NS | 7,269 | n/a | |
| Whitemarsh Island, GA | 7,264 | 39 | 22.0% |
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