| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 62°F | 48°F | 4.2" |
| February | 40°F | 65°F | 51°F | 3.4" |
| March | 47°F | 73°F | 60°F | 4.8" |
| April | 54°F | 80°F | 67°F | 4.4" |
| May | 62°F | 86°F | 74°F | 5.0" |
| June | 71°F | 93°F | 81°F | 3.7" |
| July | 73°F | 95°F | 83°F | 4.3" |
| August | 74°F | 97°F | 84°F | 3.0" |
| September | 67°F | 92°F | 79°F | 2.9" |
| October | 54°F | 82°F | 67°F | 4.9" |
| November | 45°F | 71°F | 57°F | 3.9" |
| December | 39°F | 62°F | 50°F | 4.4" |
| Index | Stonewall | Louisiana | National |
| Air quality index | 39 | 106 | 42 |
| Pollution index | 9,704,260 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 291 |
| Days with moderate air quality | 74 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.290% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.070% |
| Mercury | 0.120% |
| City | Population | Air Quality Index | National Avg. |
| Greenwood, LA | 3,155 | 39 | 22.0% |
| Frierson, LA | 209 | 39 | 22.0% |
| Keachi, LA | 387 | 39 | 22.0% |
| Gloster, LA | 41 | 39 | 22.0% |
| Longstreet, LA | 157 | 39 | 22.0% |
| Stonewall, LA | 2,376 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Cimarron, KS | 2,376 | 15 | 70.0% |
| Hermann, MO | 2,375 | 39 | 22.0% |
| Piperton, TN | 2,375 | 45 | 10.0% |
| Whidbey Island Station, WA | 2,375 | 24 | 52.0% |
| Wray, CO | 2,377 | 45 | 10.0% |
| Stonewall, LA | 2,376 | 39 | 22.0% |
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