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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 54°F | 42°F | 4.5" |
| February | 35°F | 57°F | 45°F | 3.7" |
| March | 44°F | 67°F | 55°F | 5.4" |
| April | 52°F | 77°F | 64°F | 5.9" |
| May | 61°F | 83°F | 72°F | 5.8" |
| June | 71°F | 92°F | 81°F | 3.6" |
| July | 73°F | 93°F | 83°F | 4.6" |
| August | 73°F | 93°F | 83°F | 3.9" |
| September | 66°F | 88°F | 76°F | 3.4" |
| October | 53°F | 78°F | 64°F | 3.7" |
| November | 42°F | 66°F | 53°F | 4.2" |
| December | 35°F | 56°F | 45°F | 5.6" |
| Index | Mason | Tennessee | National |
| Air quality index | 45 | 76 | 42 |
| Pollution index | 20,539,300 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 221 |
| Days with moderate air quality | 139 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.210% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.170% |
| Mercury | 0.110% |
| City | Population | Air Quality Index | National Avg. |
| Covington, TN | 8,863 | 26 | 48.0% |
| Stanton, TN | 547 | 27 | 46.0% |
| Atoka, TN | 9,407 | 45 | 10.0% |
| Brighton, TN | 2,931 | 45 | 10.0% |
| Lakeland, TN | 12,644 | 45 | 10.0% |
| Mason, TN | 1,120 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Brookside, AL | 1,120 | 53 | 6.0% |
| Sheridan, CA | 1,120 | 44 | 12.0% |
| Goreville, IL | 1,120 | 44 | 12.0% |
| Fabrica, TX | 1,120 | 25 | 50.0% |
| Minto-Odanah, MB | 1,120 | n/a | |
| Mason, TN | 1,120 | 45 | 10.0% |
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