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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 62°F | 50°F | 2.8" |
| February | 41°F | 64°F | 52°F | 3.8" |
| March | 48°F | 71°F | 59°F | 4.2" |
| April | 56°F | 79°F | 67°F | 3.9" |
| May | 64°F | 85°F | 74°F | 3.5" |
| June | 71°F | 90°F | 80°F | 4.8" |
| July | 74°F | 93°F | 82°F | 4.8" |
| August | 74°F | 91°F | 82°F | 7.7" |
| September | 69°F | 87°F | 77°F | 4.7" |
| October | 59°F | 79°F | 68°F | 3.9" |
| November | 47°F | 70°F | 58°F | 2.1" |
| December | 44°F | 66°F | 54°F | 3.3" |
| Index | Bluffton | South Carolina | National |
| Air quality index | 39 | 37 | 42 |
| Pollution index | 1,428,370 | 3,620,438 | 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. |
| Beaufort, SC | 13,417 | 29 | 42.0% |
| Burton, SC | 8,779 | 29 | 42.0% |
| Thunderbolt, GA | 2,638 | 39 | 22.0% |
| Hardeeville, SC | 6,788 | 39 | 22.0% |
| Whitemarsh Island, GA | 7,264 | 39 | 22.0% |
| Bluffton, SC | 23,176 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Clayton, NC | 23,179 | 46 | 8.0% |
| Blue Island, IL | 23,160 | 55 | 10.0% |
| Oxford, OH | 23,192 | 6 | 88.0% |
| Copiague, NY | 23,200 | 51 | 2.0% |
| Simpsonville, SC | 23,200 | 46 | 8.0% |
| Bluffton, SC | 23,176 | 39 | 22.0% |