| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 46°F | 66°F | 55°F | 3.7" |
| February | 49°F | 69°F | 58°F | 2.4" |
| March | 56°F | 75°F | 65°F | 3.2" |
| April | 62°F | 80°F | 71°F | 5.0" |
| May | 69°F | 86°F | 77°F | 4.7" |
| June | 75°F | 92°F | 83°F | 4.2" |
| July | 76°F | 93°F | 84°F | 5.7" |
| August | 77°F | 94°F | 84°F | 7.4" |
| September | 73°F | 90°F | 81°F | 4.1" |
| October | 63°F | 84°F | 73°F | 5.3" |
| November | 54°F | 75°F | 64°F | 4.1" |
| December | 49°F | 67°F | 57°F | 3.8" |
| Index | Nassau Bay | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 701,652 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 171 |
| Days with moderate air quality | 163 |
| Days w/ poor A.Q. for sensitive groups | 26 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| South Houston, TX | 17,522 | 52 | 4.0% |
| El Lago, TX | 2,805 | 52 | 4.0% |
| Pasadena, TX | 152,537 | 52 | 4.0% |
| Webster, TX | 11,229 | 52 | 4.0% |
| Kemah, TX | 2,114 | 52 | 4.0% |
| Nassau Bay, TX | 4,009 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Esparto, CA | 4,009 | 35 | 30.0% |
| Greencastle, PA | 4,008 | 40 | 20.0% |
| Shackle Island, TN | 4,010 | 45 | 10.0% |
| Ovilla, TX | 4,010 | 51 | 2.0% |
| Kildeer, IL | 4,007 | 55 | 10.0% |
| Nassau Bay, TX | 4,009 | 52 | 4.0% |
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