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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 50°F | 41°F | 8.8" |
| February | 31°F | 49°F | 39°F | 6.3" |
| March | 41°F | 64°F | 51°F | 4.7" |
| April | 47°F | 69°F | 57°F | 7.6" |
| May | 55°F | 80°F | 67°F | 5.2" |
| June | 64°F | 87°F | 75°F | 12.3" |
| July | 68°F | 89°F | 78°F | 3.3" |
| August | 70°F | 94°F | 81°F | 9.5" |
| September | 62°F | 85°F | 73°F | 5.3" |
| October | 52°F | 75°F | 63°F | 11.8" |
| November | 37°F | 59°F | 47°F | 5.4" |
| December | 31°F | 49°F | 39°F | 8.4" |
| Index | Walnut Grove | Tennessee | National |
| Air quality index | 40 | 76 | 42 |
| Pollution index | 2,417,750 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 307 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.160% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Adams, TN | 623 | 40 | 20.0% |
| Trenton, KY | 410 | 40 | 20.0% |
| Cedar Hill, TN | 276 | 40 | 20.0% |
| Clarksville, TN | 160,664 | 40 | 20.0% |
| Walnut Grove CDP (Hardin County), TN | 261 | 40 | 20.0% |
| Walnut Grove, TN | 966 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Lake View, IA | 966 | 35 | 30.0% |
| Brownsville, KY | 966 | 43 | 14.0% |
| Humphrey, NE | 966 | 19 | 62.0% |
| Saint-Narcisse-de-Rimouski, QC | 966 | n/a | |
| Inkom, ID | 967 | 27 | 46.0% |
| Walnut Grove, TN | 966 | 40 | 20.0% |
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