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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 65°F | 50°F | 3.2" |
| February | 39°F | 68°F | 53°F | 3.5" |
| March | 46°F | 74°F | 59°F | 3.2" |
| April | 53°F | 81°F | 67°F | 3.3" |
| May | 61°F | 86°F | 73°F | 4.4" |
| June | 70°F | 92°F | 80°F | 6.5" |
| July | 73°F | 94°F | 81°F | 5.3" |
| August | 73°F | 93°F | 81°F | 6.1" |
| September | 68°F | 89°F | 77°F | 4.0" |
| October | 57°F | 81°F | 68°F | 4.2" |
| November | 45°F | 73°F | 58°F | 2.1" |
| December | 43°F | 68°F | 54°F | 4.2" |
| Index | Hardeeville | 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. |
| Ridgeland, SC | 3,903 | 29 | 42.0% |
| Garden City, GA | 8,957 | 39 | 22.0% |
| Rincon, GA | 10,187 | 39 | 22.0% |
| Pooler, GA | 24,575 | 39 | 22.0% |
| Springfield, GA | 4,026 | 39 | 22.0% |
| Hardeeville, SC | 6,788 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Leitchfield, KY | 6,789 | 39 | 22.0% |
| Osceola, AR | 6,786 | 45 | 10.0% |
| Thurmont, MD | 6,783 | 40 | 20.0% |
| Lochbuie, CO | 6,795 | 58 | 16.0% |
| Fairwood, MD | 6,780 | 46 | 8.0% |
| Hardeeville, SC | 6,788 | 39 | 22.0% |
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