| 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 | Greenville | Georgia | National |
| Air quality index | 42 | 41 | 42 |
| Pollution index | 448,589 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 257 |
| Days with moderate air quality | 108 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Gay, GA | 122 | 42 | 16.0% |
| Lone Oak, GA | 77 | 42 | 16.0% |
| Manchester, GA | 3,982 | 42 | 16.0% |
| Pine Mountain, GA | 1,739 | 42 | 16.0% |
| Molena, GA | 701 | 42 | 16.0% |
| Greenville, GA | 1,002 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Egan, LA | 1,002 | 41 | 18.0% |
| Seaman, OH | 1,002 | 14 | 72.0% |
| Kaslo, BC | 1,002 | n/a | |
| Geraldine, AL | 1,003 | 39 | 22.0% |
| Palo, IA | 1,003 | 39 | 22.0% |
| Greenville, GA | 1,002 | 42 | 16.0% |
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