| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 51°F | 40°F | 4.1" |
| February | 33°F | 53°F | 42°F | 3.4" |
| March | 41°F | 65°F | 52°F | 5.8" |
| April | 50°F | 74°F | 62°F | 5.8" |
| May | 58°F | 81°F | 69°F | 6.0" |
| June | 67°F | 89°F | 77°F | 4.8" |
| July | 69°F | 91°F | 79°F | 4.2" |
| August | 68°F | 91°F | 79°F | 3.0" |
| September | 61°F | 85°F | 72°F | 3.6" |
| October | 48°F | 74°F | 60°F | 3.5" |
| November | 39°F | 63°F | 50°F | 4.0" |
| December | 34°F | 53°F | 43°F | 5.5" |
| Index | Grand Junction | Tennessee | National |
| Air quality index | 45 | 76 | 42 |
| Pollution index | 752,278 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 221 |
| Days with moderate air quality | 139 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.100% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hickory Valley, TN | 90 | 27 | 46.0% |
| Bolivar, TN | 5,108 | 27 | 46.0% |
| Saulsbury, TN | 255 | 27 | 46.0% |
| Ashland, MS | 512 | 39 | 22.0% |
| Falkner, MS | 954 | 39 | 22.0% |
| Grand Junction, TN | 400 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Kiana, AK | 400 | 38 | 24.0% |
| Fall River Mills, CA | 400 | 42 | 16.0% |
| Hull, IL | 400 | 41 | 18.0% |
| Delphos, KS | 400 | 32 | 36.0% |
| Barton Hills, MI | 400 | 40 | 20.0% |
| Grand Junction, TN | 400 | 45 | 10.0% |