| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 49°F | 39°F | 5.9" |
| February | 31°F | 51°F | 40°F | 3.7" |
| March | 40°F | 63°F | 50°F | 4.7" |
| April | 48°F | 73°F | 60°F | 5.8" |
| May | 56°F | 79°F | 67°F | 4.7" |
| June | 65°F | 87°F | 75°F | 3.2" |
| July | 68°F | 88°F | 77°F | 6.2" |
| August | 69°F | 90°F | 78°F | 3.3" |
| September | 62°F | 83°F | 71°F | 3.9" |
| October | 49°F | 71°F | 59°F | 4.3" |
| November | 38°F | 61°F | 48°F | 4.2" |
| December | 33°F | 51°F | 41°F | 6.3" |
| Index | Harriman | Tennessee | National |
| Air quality index | 53 | 76 | 42 |
| Pollution index | 7,263,220 | 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 | 0.240% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.080% |
| Mercury | 0.300% |
| City | Population | Air Quality Index | National Avg. |
| Oakdale, TN | 241 | 53 | 6.0% |
| Oliver Springs, TN | 3,918 | 53 | 6.0% |
| Coalfield, TN | 2,861 | 53 | 6.0% |
| Petros, TN | 526 | 53 | 6.0% |
| Rockwood, TN | 5,446 | 53 | 6.0% |
| Harriman, TN | 6,144 | 53 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Bonnyville, AB | 6,142 | n/a | |
| Silver Lake, NC | 6,146 | 34 | 32.0% |
| Junction City, OR | 6,140 | 38 | 24.0% |
| Latimer, MS | 6,148 | 42 | 16.0% |
| East End, AR | 6,150 | 45 | 10.0% |
| Harriman, TN | 6,144 | 53 | 6.0% |
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