| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 46°F | 63°F | 53°F | 5.5" |
| February | 50°F | 67°F | 57°F | 6.1" |
| March | 55°F | 76°F | 64°F | 5.5" |
| April | 58°F | 79°F | 68°F | 4.2" |
| May | 67°F | 86°F | 75°F | 10.9" |
| June | 73°F | 92°F | 82°F | 4.2" |
| July | 74°F | 91°F | 82°F | 8.4" |
| August | 75°F | 94°F | 83°F | 7.7" |
| September | 73°F | 92°F | 81°F | 3.5" |
| October | 61°F | 84°F | 71°F | 9.9" |
| November | 54°F | 76°F | 64°F | 4.3" |
| December | 45°F | 68°F | 56°F | 6.2" |
| Index | Missouri City | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 2,403,330 | 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 | 0.001% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Hedwig Village, TX | 2,732 | 52 | 4.0% |
| Bellaire, TX | 19,553 | 52 | 4.0% |
| Fresno, TX | 24,561 | 52 | 4.0% |
| Piney Point Village, TX | 3,522 | 52 | 4.0% |
| West University Place, TX | 16,021 | 52 | 4.0% |
| Missouri City, TX | 77,696 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Baytown, TX | 77,698 | 52 | 4.0% |
| Georgetown, TX | 77,731 | 44 | 12.0% |
| Carmichael, CA | 77,824 | 52 | 4.0% |
| Bethlehem, PA | 77,503 | 42 | 16.0% |
| Buckeye, AZ | 77,435 | 74 | 48.0% |
| Missouri City, TX | 77,696 | 52 | 4.0% |
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