| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 63°F | 50°F | 5.3" |
| February | 42°F | 66°F | 53°F | 4.5" |
| March | 49°F | 74°F | 61°F | 5.1" |
| April | 56°F | 80°F | 67°F | 8.6" |
| May | 62°F | 86°F | 73°F | 8.0" |
| June | 69°F | 91°F | 80°F | 5.8" |
| July | 71°F | 92°F | 81°F | 3.9" |
| August | 71°F | 93°F | 81°F | 4.3" |
| September | 65°F | 89°F | 76°F | 8.2" |
| October | 53°F | 82°F | 66°F | 4.1" |
| November | 46°F | 72°F | 58°F | 3.6" |
| December | 43°F | 65°F | 53°F | 7.9" |
| Index | McNary | 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. |
| Lecompte, LA | 811 | 30 | 40.0% |
| Glenmora, LA | 1,413 | 30 | 40.0% |
| Woodworth, LA | 2,019 | 30 | 40.0% |
| Oakdale, LA | 7,571 | 30 | 40.0% |
| Elizabeth, LA | 656 | 30 | 40.0% |
| McNary, LA | 170 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| White Mountain, AK | 170 | 38 | 24.0% |
| Palominas, AZ | 170 | 45 | 10.0% |
| Santa Claus, GA | 170 | 26 | 48.0% |
| Haverhill, IA | 170 | 37 | 26.0% |
| Webster, IA | 170 | 35 | 30.0% |
| McNary, LA | 170 | 30 | 40.0% |
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