| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 58°F | 46°F | 7.1" |
| February | 40°F | 62°F | 50°F | 4.5" |
| March | 47°F | 71°F | 58°F | 7.6" |
| April | 54°F | 77°F | 65°F | 11.1" |
| May | 61°F | 83°F | 71°F | 9.5" |
| June | 69°F | 90°F | 79°F | 8.5" |
| July | 72°F | 93°F | 81°F | 8.6" |
| August | 71°F | 93°F | 81°F | 7.5" |
| September | 64°F | 88°F | 75°F | 5.5" |
| October | 53°F | 79°F | 64°F | 12.0" |
| November | 44°F | 68°F | 55°F | 9.4" |
| December | 40°F | 60°F | 49°F | 7.6" |
| Index | Ruston | Louisiana | National |
| Air quality index | 34 | 106 | 42 |
| Pollution index | 1,169,020 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 335 |
| Days with moderate air quality | 28 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Quitman, LA | 281 | 34 | 32.0% |
| Eros, LA | 204 | 34 | 32.0% |
| Simsboro, LA | 922 | 34 | 32.0% |
| Choudrant, LA | 1,458 | 34 | 32.0% |
| Grambling, LA | 5,168 | 34 | 32.0% |
| Ruston, LA | 21,987 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Martha Lake, WA | 21,987 | 45 | 10.0% |
| Port Hueneme, CA | 21,979 | 46 | 8.0% |
| West Rancho Dominguez, CA | 21,977 | 72 | 44.0% |
| Union City, GA | 21,976 | 52 | 4.0% |
| Marina, CA | 21,966 | 37 | 26.0% |
| Ruston, LA | 21,987 | 34 | 32.0% |
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