| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 45°F | 64°F | 55°F | 7.9" |
| February | 48°F | 67°F | 57°F | 5.9" |
| March | 54°F | 73°F | 64°F | 8.1" |
| April | 61°F | 79°F | 71°F | 8.8" |
| May | 67°F | 84°F | 77°F | 9.4" |
| June | 73°F | 90°F | 82°F | 13.1" |
| July | 75°F | 90°F | 82°F | 5.2" |
| August | 75°F | 91°F | 82°F | 5.9" |
| September | 71°F | 88°F | 79°F | 2.9" |
| October | 61°F | 81°F | 71°F | 3.2" |
| November | 52°F | 73°F | 62°F | 1.8" |
| December | 49°F | 67°F | 57°F | 5.7" |
| Index | Gray | Louisiana | National |
| Air quality index | 41 | 106 | 42 |
| Pollution index | 3,618,980 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 272 |
| Days with moderate air quality | 87 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Raceland, LA | 10,835 | 41 | 18.0% |
| Chackbay, LA | 5,108 | 41 | 18.0% |
| Bayou Country Club, LA | 1,363 | 41 | 18.0% |
| Lockport Heights, LA | 1,706 | 41 | 18.0% |
| Schriever, LA | 5,734 | 41 | 18.0% |
| Gray, LA | 6,366 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Fowler, CA | 6,366 | 60 | 20.0% |
| Hamlet, NC | 6,366 | 30 | 40.0% |
| Steilacoom, WA | 6,366 | 30 | 40.0% |
| Brunswick, MD | 6,364 | 40 | 20.0% |
| Air Force Academy, CO | 6,368 | 45 | 10.0% |
| Gray, LA | 6,366 | 41 | 18.0% |
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