| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 47°F | 37°F | 4.0" |
| February | 30°F | 50°F | 39°F | 3.7" |
| March | 39°F | 62°F | 50°F | 4.2" |
| April | 49°F | 73°F | 60°F | 5.8" |
| May | 57°F | 79°F | 68°F | 5.7" |
| June | 66°F | 88°F | 77°F | 4.1" |
| July | 69°F | 90°F | 79°F | 5.7" |
| August | 68°F | 90°F | 78°F | 4.7" |
| September | 60°F | 83°F | 71°F | 4.4" |
| October | 48°F | 72°F | 59°F | 3.9" |
| November | 38°F | 61°F | 49°F | 3.5" |
| December | 32°F | 51°F | 41°F | 4.7" |
| Index | Westmoreland | Tennessee | National |
| Air quality index | 43 | 76 | 42 |
| Pollution index | 7,691,510 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 268 |
| Days with moderate air quality | 97 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.180% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.440% |
| City | Population | Air Quality Index | National Avg. |
| Bransford, TN | 276 | 43 | 14.0% |
| Fairfield, TN | 204 | 43 | 14.0% |
| Lafayette, TN | 5,393 | 43 | 14.0% |
| Scottsville, KY | 4,625 | 43 | 14.0% |
| Graball, TN | 107 | 45 | 10.0% |
| Westmoreland, TN | 2,679 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Trinity, AL | 2,678 | 41 | 18.0% |
| Christopher, IL | 2,678 | 43 | 14.0% |
| Pearl River, LA | 2,680 | 45 | 10.0% |
| Lincoln, ME | 2,680 | 31 | 38.0% |
| Thomaston, NY | 2,680 | 51 | 2.0% |
| Westmoreland, TN | 2,679 | 43 | 14.0% |