| 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 | Helenwood | Tennessee | National |
| Air quality index | 53 | 76 | 42 |
| Pollution index | 325,196 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 148 |
| Days with moderate air quality | 216 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Oneida, TN | 3,719 | 40 | 20.0% |
| Winfield, TN | 1,126 | 40 | 20.0% |
| Huntsville, TN | 1,475 | 53 | 6.0% |
| Sunbright, TN | 601 | 53 | 6.0% |
| Robbins, TN | 93 | 53 | 6.0% |
| Helenwood, TN | 400 | 53 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Edmondson, AR | 400 | 45 | 10.0% |
| Terminous, CA | 400 | 45 | 10.0% |
| Cloud Lake, FL | 400 | 36 | 28.0% |
| Lakota, IA | 400 | 15 | 70.0% |
| Arenzville, IL | 400 | 40 | 20.0% |
| Helenwood, TN | 400 | 53 | 6.0% |
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