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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 48°F | 36°F | 4.1" |
| February | 28°F | 50°F | 38°F | 3.3" |
| March | 38°F | 63°F | 50°F | 5.5" |
| April | 47°F | 74°F | 60°F | 5.8" |
| May | 55°F | 80°F | 68°F | 4.9" |
| June | 65°F | 89°F | 77°F | 4.3" |
| July | 68°F | 91°F | 79°F | 5.2" |
| August | 66°F | 91°F | 78°F | 4.1" |
| September | 59°F | 85°F | 71°F | 3.9" |
| October | 47°F | 74°F | 59°F | 3.9" |
| November | 36°F | 62°F | 48°F | 4.2" |
| December | 29°F | 50°F | 39°F | 5.4" |
| Index | Cottage Grove | Tennessee | National |
| Air quality index | 44 | 76 | 42 |
| Pollution index | 1,510,680 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 261 |
| Days with moderate air quality | 103 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Dresden, TN | 3,012 | 26 | 48.0% |
| Henry, TN | 520 | 27 | 46.0% |
| Paris, TN | 10,260 | 27 | 46.0% |
| Gleason, TN | 1,581 | 27 | 46.0% |
| Puryear, TN | 712 | 44 | 12.0% |
| Cottage Grove, TN | 62 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Igiugig, AK | 62 | 31 | 38.0% |
| Klukwan, AK | 62 | 20 | 60.0% |
| Whitestone, AK | 62 | 38 | 24.0% |
| Petrey, AL | 62 | 52 | 4.0% |
| Yucca, AZ | 62 | 13 | 74.0% |
| Cottage Grove, TN | 62 | 44 | 12.0% |
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