| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 57°F | 44°F | 4.7" |
| February | 36°F | 60°F | 47°F | 4.5" |
| March | 44°F | 68°F | 55°F | 4.6" |
| April | 51°F | 76°F | 64°F | 4.6" |
| May | 60°F | 82°F | 71°F | 3.7" |
| June | 68°F | 89°F | 78°F | 4.3" |
| July | 71°F | 91°F | 80°F | 5.2" |
| August | 71°F | 90°F | 79°F | 5.3" |
| September | 65°F | 85°F | 74°F | 3.3" |
| October | 53°F | 76°F | 64°F | 3.4" |
| November | 42°F | 67°F | 54°F | 3.4" |
| December | 38°F | 59°F | 48°F | 6.2" |
| Index | Conley | Georgia | National |
| Air quality index | 52 | 41 | 50 |
| Pollution index | 19,982,200 | 3,237,553 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 162 |
| Days with moderate air quality | 184 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.210% |
| Benzene | 0.260% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.100% |
| Mercury | 0.010% |
| City, State | Population | Air Quality Index | National Avg. |
| Hapeville, GA | 6,658 | 52 | 4% |
| Irondale, GA | 8,472 | 52 | 4% |
| Atlanta, GA | 456,378 | 52 | 4% |
| Decatur, GA | 21,210 | 52 | 4% |
| Lake City, GA | 2,712 | 52 | 4% |
| Conley, GA | 5,397 | 52 | 4% |
| City, State | Population | Air Quality Index | National Avg. |
| St. Robert, MO | 5,396 | 39 | 22% |
| Starke, FL | 5,398 | 35 | 30% |
| St. Clair, MI | 5,395 | 56 | 12% |
| Uhrichsville, OH | 5,399 | 46 | 8% |
| Anthony, TX | 5,402 | 53 | 6% |
| Conley, GA | 5,397 | 52 | 4% |
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