| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 46°F | 35°F | 5.6" |
| February | 26°F | 50°F | 38°F | 4.7" |
| March | 36°F | 62°F | 49°F | 6.8" |
| April | 44°F | 72°F | 58°F | 8.0" |
| May | 54°F | 78°F | 66°F | 8.3" |
| June | 61°F | 86°F | 73°F | 5.2" |
| July | 64°F | 88°F | 75°F | 8.5" |
| August | 63°F | 87°F | 74°F | 6.8" |
| September | 57°F | 81°F | 68°F | 8.6" |
| October | 44°F | 72°F | 57°F | 5.2" |
| November | 33°F | 60°F | 46°F | 5.8" |
| December | 29°F | 50°F | 39°F | 6.8" |
| Index | Winfield | Tennessee | National |
| Air quality index | 40 | 76 | 42 |
| Pollution index | 207,444 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 282 |
| Days with good air quality | 267 |
| Days with moderate air quality | 15 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Pine Knot, KY | 1,431 | 40 | 20.0% |
| Stearns, KY | 1,065 | 40 | 20.0% |
| Oneida, TN | 3,719 | 40 | 20.0% |
| Whitley City, KY | 1,633 | 40 | 20.0% |
| Huntsville, TN | 1,475 | 53 | 6.0% |
| Winfield, TN | 1,126 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Atwood, IL | 1,126 | 42 | 16.0% |
| Ansonia, OH | 1,126 | 6 | 88.0% |
| Midtown, TN | 1,126 | 53 | 6.0% |
| Spring Glen, UT | 1,126 | 46 | 8.0% |
| Division No. 18, Unorganized, SK | 1,126 | n/a | |
| Winfield, TN | 1,126 | 40 | 20.0% |
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