| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 54°F | 42°F | 8.0" |
| February | 34°F | 56°F | 44°F | 7.2" |
| March | 43°F | 67°F | 54°F | 7.5" |
| April | 50°F | 75°F | 62°F | 7.6" |
| May | 57°F | 81°F | 68°F | 6.5" |
| June | 66°F | 89°F | 76°F | 5.7" |
| July | 69°F | 90°F | 78°F | 8.6" |
| August | 69°F | 90°F | 78°F | 7.2" |
| September | 62°F | 84°F | 72°F | 7.1" |
| October | 50°F | 75°F | 61°F | 4.3" |
| November | 38°F | 64°F | 49°F | 3.3" |
| December | 36°F | 56°F | 45°F | 11.8" |
| Index | Walnut Grove | Alabama | National |
| Air quality index | 43 | 37 | 42 |
| Pollution index | 2,295,500 | 3,012,339 | 2,726,193 |
| Measurement | Total |
| Days measured | 279 |
| Days with good air quality | 232 |
| Days with moderate air quality | 47 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Altoona, AL | 1,250 | 43 | 14.0% |
| Carlisle-Rockledge, AL | 2,530 | 43 | 14.0% |
| Highland Lake, AL | 396 | 43 | 14.0% |
| Sardis City, AL | 1,741 | 43 | 14.0% |
| Reece City, AL | 851 | 43 | 14.0% |
| Walnut Grove, AL | 875 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Hooper Bay, AK | 875 | 31 | 38.0% |
| Taylor, AR | 875 | 39 | 22.0% |
| Acalanes Ridge, CA | 875 | 40 | 20.0% |
| Worden, IL | 875 | 54 | 8.0% |
| Crescent, LA | 875 | 45 | 10.0% |
| Walnut Grove, AL | 875 | 43 | 14.0% |
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