| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 56°F | 43°F | 3.8" |
| February | 34°F | 59°F | 45°F | 4.6" |
| March | 42°F | 69°F | 54°F | 4.4" |
| April | 49°F | 76°F | 62°F | 3.9" |
| May | 56°F | 82°F | 69°F | 3.2" |
| June | 65°F | 90°F | 77°F | 3.1" |
| July | 68°F | 91°F | 78°F | 4.5" |
| August | 68°F | 90°F | 78°F | 4.2" |
| September | 62°F | 85°F | 72°F | 3.5" |
| October | 49°F | 76°F | 61°F | 3.4" |
| November | 38°F | 66°F | 51°F | 3.5" |
| December | 37°F | 60°F | 47°F | 6.1" |
| Index | Thomaston | Georgia | National |
| Air quality index | 38 | 41 | 42 |
| Pollution index | 448,589 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 278 |
| Days with moderate air quality | 84 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Zebulon, GA | 1,427 | 38 | 24.0% |
| Culloden, GA | 273 | 38 | 24.0% |
| Meansville, GA | 158 | 38 | 24.0% |
| Salem, GA | 358 | 38 | 24.0% |
| Hannahs Mill, GA | 3,571 | 38 | 24.0% |
| Thomaston, GA | 8,771 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Rockingham, NC | 8,771 | 41 | 18.0% |
| Airmont, NY | 8,771 | 51 | 2.0% |
| Laurel Hill, VA | 8,771 | 40 | 20.0% |
| Pingree Grove, IL | 8,768 | 42 | 16.0% |
| Kulpsville, PA | 8,768 | 51 | 2.0% |
| Thomaston, GA | 8,771 | 38 | 24.0% |
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