| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 46°F | 36°F | 4.7" |
| February | 31°F | 50°F | 40°F | 4.6" |
| March | 39°F | 60°F | 49°F | 5.7" |
| April | 48°F | 71°F | 59°F | 5.8" |
| May | 55°F | 76°F | 65°F | 4.4" |
| June | 62°F | 82°F | 72°F | 5.0" |
| July | 66°F | 84°F | 75°F | 6.8" |
| August | 65°F | 84°F | 74°F | 3.8" |
| September | 58°F | 79°F | 68°F | 4.1" |
| October | 47°F | 70°F | 58°F | 3.6" |
| November | 38°F | 59°F | 48°F | 4.8" |
| December | 33°F | 50°F | 41°F | 6.4" |
| Index | Grimsley | Tennessee | National |
| Air quality index | 25 | 76 | 42 |
| Pollution index | 325,196 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 351 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| 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. |
| Bowman, TN | 91 | 25 | 50.0% |
| Jamestown, TN | 2,145 | 25 | 50.0% |
| Clarkrange, TN | 794 | 25 | 50.0% |
| Monterey, TN | 2,865 | 25 | 50.0% |
| Allardt, TN | 992 | 53 | 6.0% |
| Grimsley, TN | 975 | 25 | 50.0% |
| City | Population | Air Quality Index | National Avg. |
| Chatom, AL | 975 | 42 | 16.0% |
| Cripple Creek, CO | 975 | 16 | 68.0% |
| Tioga, ND | 975 | 34 | 32.0% |
| Vega, TX | 975 | 44 | 12.0% |
| Entiat, WA | 975 | 24 | 52.0% |
| Grimsley, TN | 975 | 25 | 50.0% |
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