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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 52°F | 43°F | 7.2" |
| February | 32°F | 52°F | 42°F | 3.3" |
| March | 43°F | 68°F | 55°F | 6.3" |
| April | 48°F | 71°F | 60°F | 4.8" |
| May | 56°F | 83°F | 71°F | 4.4" |
| June | 67°F | 91°F | 79°F | 3.3" |
| July | 71°F | 92°F | 81°F | 2.2" |
| August | 73°F | 99°F | 87°F | 1.6" |
| September | 64°F | 91°F | 78°F | 4.0" |
| October | 52°F | 77°F | 65°F | 9.6" |
| November | 41°F | 65°F | 53°F | 6.3" |
| December | 34°F | 53°F | 43°F | 6.0" |
| Index | Walterhill | Tennessee | National |
| Air quality index | 45 | 76 | 42 |
| Pollution index | 14,929,800 | 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 | 0.020% |
| Benzene | 0.170% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.050% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Watertown, TN | 1,698 | 25 | 50.0% |
| Rockvale, TN | 1,592 | 31 | 38.0% |
| Rural Hill, TN | 2,558 | 45 | 10.0% |
| La Vergne, TN | 35,556 | 45 | 10.0% |
| Smyrna, TN | 50,820 | 45 | 10.0% |
| Walterhill, TN | 158 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Five Points, AL | 158 | 42 | 16.0% |
| Paradise CDP, CA | 158 | 46 | 8.0% |
| Deepstep, GA | 158 | 38 | 24.0% |
| Meansville, GA | 158 | 38 | 24.0% |
| Bentley, IA | 158 | 40 | 20.0% |
| Walterhill, TN | 158 | 45 | 10.0% |
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