| 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 | Riverdale | Georgia | National |
| Air quality index | 52 | 41 | 42 |
| Pollution index | 531,544 | 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 | 0.020% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.060% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Fairburn, GA | 15,956 | 52 | 4.0% |
| Jonesboro, GA | 5,428 | 52 | 4.0% |
| Tyrone, GA | 7,427 | 52 | 4.0% |
| Belvedere Park, GA | 15,028 | 52 | 4.0% |
| Forest Park, GA | 19,884 | 52 | 4.0% |
| Riverdale, GA | 15,455 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Colonial Park, PA | 15,457 | 44 | 12.0% |
| Hueytown, AL | 15,446 | 53 | 6.0% |
| Tanque Verde, AZ | 15,446 | 47 | 6.0% |
| Seymour, TN | 15,444 | 44 | 12.0% |
| Pacific Grove, CA | 15,471 | 37 | 26.0% |
| Riverdale, GA | 15,455 | 52 | 4.0% |
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