| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 55°F | 43°F | 4.5" |
| February | 34°F | 56°F | 44°F | 3.6" |
| March | 41°F | 66°F | 53°F | 4.7" |
| April | 49°F | 74°F | 61°F | 3.4" |
| May | 58°F | 80°F | 69°F | 4.0" |
| June | 67°F | 89°F | 77°F | 4.0" |
| July | 70°F | 90°F | 79°F | 4.5" |
| August | 71°F | 91°F | 80°F | 3.4" |
| September | 64°F | 84°F | 73°F | 3.4" |
| October | 52°F | 73°F | 62°F | 4.1" |
| November | 41°F | 64°F | 52°F | 3.1" |
| December | 36°F | 56°F | 45°F | 6.2" |
| Index | Hartwell | Georgia | National |
| Air quality index | 31 | 41 | 42 |
| Pollution index | 770,308 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 250 |
| Days with good air quality | 248 |
| Days with moderate air quality | 2 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Reed Creek, GA | 2,751 | 31 | 38.0% |
| Starr, SC | 149 | 31 | 38.0% |
| Eagle Grove, GA | 0 | 31 | 38.0% |
| Centerville, SC | 6,816 | 31 | 38.0% |
| Bowersville, GA | 679 | 41 | 18.0% |
| Hartwell, GA | 4,382 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Beaufort, NC | 4,382 | 37 | 26.0% |
| Milton, NY | 4,382 | 37 | 26.0% |
| Edgewood, OH | 4,382 | 34 | 32.0% |
| Boalsburg, PA | 4,381 | 44 | 12.0% |
| La Verkin, UT | 4,383 | 44 | 12.0% |
| Hartwell, GA | 4,382 | 31 | 38.0% |
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