| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 65°F | 53°F | 5.2" |
| February | 45°F | 66°F | 54°F | 5.0" |
| March | 51°F | 74°F | 62°F | 3.1" |
| April | 58°F | 80°F | 68°F | 3.2" |
| May | 66°F | 86°F | 75°F | 5.7" |
| June | 72°F | 92°F | 81°F | 3.0" |
| July | 74°F | 92°F | 82°F | 5.2" |
| August | 74°F | 93°F | 82°F | 7.9" |
| September | 70°F | 89°F | 78°F | 6.9" |
| October | 58°F | 81°F | 69°F | 5.6" |
| November | 49°F | 73°F | 59°F | 2.7" |
| December | 45°F | 66°F | 54°F | 9.3" |
| Index | Shenandoah | Louisiana | National |
| Air quality index | 45 | 106 | 42 |
| Pollution index | 1,932,420 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 224 |
| Days with moderate air quality | 132 |
| Days w/ poor A.Q. for sensitive groups | 9 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Brusly, LA | 2,690 | 45 | 10.0% |
| Denham Springs, LA | 9,908 | 45 | 10.0% |
| Old Jefferson, LA | 7,321 | 45 | 10.0% |
| Watson, LA | 1,225 | 45 | 10.0% |
| Brownfields, LA | 5,936 | 45 | 10.0% |
| Shenandoah, LA | 21,045 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| DeBary, FL | 21,053 | 37 | 26.0% |
| Lakeside, CA | 21,032 | 64 | 28.0% |
| Chambersburg, PA | 21,017 | 36 | 28.0% |
| Eustis, FL | 21,010 | 37 | 26.0% |
| Florida Ridge, FL | 21,081 | 36 | 28.0% |
| Shenandoah, LA | 21,045 | 45 | 10.0% |
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