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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 54°F | 43°F | 8.0" |
| February | 35°F | 57°F | 45°F | 6.6" |
| March | 44°F | 67°F | 55°F | 6.9" |
| April | 51°F | 75°F | 63°F | 8.0" |
| May | 59°F | 81°F | 70°F | 8.0" |
| June | 68°F | 88°F | 78°F | 7.0" |
| July | 70°F | 89°F | 79°F | 8.2" |
| August | 70°F | 89°F | 79°F | 7.2" |
| September | 64°F | 83°F | 73°F | 9.0" |
| October | 52°F | 74°F | 62°F | 9.1" |
| November | 41°F | 64°F | 52°F | 8.1" |
| December | 38°F | 57°F | 47°F | 9.2" |
| Index | Smyrna | Georgia | National |
| Air quality index | 52 | 41 | 42 |
| Pollution index | 19,982,200 | 1,874,972 | 2,726,193 |
| 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. |
| Hapeville, GA | 6,837 | 52 | 4.0% |
| Kennesaw, GA | 35,226 | 52 | 4.0% |
| Austell, GA | 8,019 | 52 | 4.0% |
| Decatur, GA | 25,677 | 52 | 4.0% |
| Fair Oaks, GA | 9,671 | 52 | 4.0% |
| Smyrna, GA | 58,048 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Diamond Bar, CA | 57,925 | 89 | 78.0% |
| Caldwell, ID | 58,211 | 36 | 28.0% |
| Valdosta, GA | 57,835 | 35 | 30.0% |
| Pocatello, ID | 57,833 | 27 | 46.0% |
| Tamiami, FL | 57,787 | 41 | 18.0% |
| Smyrna, GA | 58,048 | 52 | 4.0% |