| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 63°F | 50°F | 5.8" |
| February | 43°F | 65°F | 53°F | 4.9" |
| March | 51°F | 74°F | 61°F | 5.0" |
| April | 58°F | 80°F | 68°F | 5.9" |
| May | 64°F | 86°F | 74°F | 4.0" |
| June | 71°F | 92°F | 80°F | 4.9" |
| July | 73°F | 93°F | 82°F | 5.0" |
| August | 73°F | 95°F | 82°F | 3.8" |
| September | 68°F | 90°F | 77°F | 3.5" |
| October | 56°F | 82°F | 68°F | 4.7" |
| November | 48°F | 72°F | 58°F | 4.3" |
| December | 44°F | 64°F | 52°F | 5.6" |
| Index | Simpson | Louisiana | National |
| Air quality index | 30 | 106 | 42 |
| Pollution index | 6,790,160 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 119 |
| Days with good air quality | 107 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.100% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Fort Polk North, LA | 2,400 | 30 | 40.0% |
| Fort Polk South, LA | 8,823 | 30 | 40.0% |
| Simpson, LA | 467 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Lisman, AL | 467 | 36 | 28.0% |
| Paragon, IN | 467 | 42 | 16.0% |
| Kenvir, KY | 467 | 39 | 22.0% |
| Soudan, MN | 467 | 35 | 30.0% |
| Center, MO | 467 | 41 | 18.0% |
| Simpson, LA | 467 | 30 | 40.0% |
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