| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 59°F | 46°F | 6.4" |
| February | 35°F | 59°F | 46°F | 5.5" |
| March | 43°F | 70°F | 55°F | 8.9" |
| April | 47°F | 73°F | 60°F | 5.5" |
| May | 55°F | 82°F | 69°F | 7.3" |
| June | 66°F | 89°F | 77°F | 6.1" |
| July | 70°F | 89°F | 78°F | 12.8" |
| August | 72°F | 94°F | 82°F | 6.1" |
| September | 65°F | 88°F | 76°F | 1.4" |
| October | 54°F | 77°F | 64°F | 3.9" |
| November | 40°F | 67°F | 53°F | 5.3" |
| December | 35°F | 57°F | 45°F | 4.9" |
| Index | Mechanicsville | Atlanta | Georgia |
| Air quality index | 52 | 52 | 41 |
| Pollution index | 19,982,200 | 19,982,200 | 1,874,972 |
| 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 | Population | Air Quality Index | National Avg. |
| Fair Oaks, GA | 9,447 | 52 | 4.0% |
| Mableton, GA | 41,647 | 52 | 4.0% |
| Panthersville, GA | 10,164 | 52 | 4.0% |
| Union City, GA | 21,976 | 52 | 4.0% |
| Chamblee, GA | 29,874 | 52 | 4.0% |
| Atlanta, GA | 497,642 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Sacramento, CA | 503,482 | 52 | 4.0% |
| Kansas City, MO | 491,158 | 47 | 6.0% |
| Mesa, AZ | 508,918 | 74 | 48.0% |
| Omaha, NE | 479,529 | 40 | 20.0% |
| Colorado Springs, CO | 471,686 | 45 | 10.0% |
| Atlanta, GA | 497,642 | 52 | 4.0% |
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