| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 52°F | 39°F | 4.2" |
| February | 31°F | 54°F | 42°F | 3.4" |
| March | 39°F | 65°F | 52°F | 4.1" |
| April | 49°F | 75°F | 62°F | 5.6" |
| May | 56°F | 82°F | 69°F | 5.1" |
| June | 66°F | 90°F | 78°F | 3.9" |
| July | 69°F | 92°F | 80°F | 5.0" |
| August | 69°F | 92°F | 79°F | 4.5" |
| September | 61°F | 86°F | 73°F | 4.0" |
| October | 49°F | 75°F | 61°F | 4.0" |
| November | 38°F | 64°F | 50°F | 3.8" |
| December | 33°F | 54°F | 43°F | 5.1" |
| Index | Franklin | Tennessee | National |
| Air quality index | 45 | 76 | 42 |
| Pollution index | 1,219,980 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 229 |
| Days with moderate air quality | 135 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Spring Hill, TN | 41,797 | 31 | 38.0% |
| Thompson's Station, TN | 6,116 | 31 | 38.0% |
| Eagleville, TN | 943 | 31 | 38.0% |
| Pegram, TN | 2,492 | 45 | 10.0% |
| Oak Hill, TN | 4,536 | 45 | 10.0% |
| Franklin, TN | 80,675 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Tustin, CA | 80,815 | 89 | 78.0% |
| Deerfield Beach, FL | 80,822 | 41 | 18.0% |
| Auburn, WA | 80,914 | 45 | 10.0% |
| Springdale, AR | 80,433 | 44 | 12.0% |
| Farmington Hills, MI | 80,937 | 56 | 12.0% |
| Franklin, TN | 80,675 | 45 | 10.0% |
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