| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 47°F | 65°F | 55°F | 3.7" |
| February | 49°F | 68°F | 57°F | 2.9" |
| March | 56°F | 74°F | 64°F | 3.6" |
| April | 62°F | 79°F | 70°F | 5.6" |
| May | 70°F | 87°F | 77°F | 4.0" |
| June | 75°F | 92°F | 83°F | 6.0" |
| July | 76°F | 92°F | 83°F | 9.1" |
| August | 77°F | 93°F | 84°F | 5.1" |
| September | 73°F | 89°F | 80°F | 6.1" |
| October | 64°F | 83°F | 72°F | 10.0" |
| November | 55°F | 75°F | 64°F | 3.7" |
| December | 47°F | 66°F | 56°F | 4.0" |
| Index | Northwest | Houston | Texas |
| Air quality index | 52 | 52 | 52 |
| Pollution index | 70,353,000 | 2,906,860 | 2,009,300 |
| 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 | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.001% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Aldine, TX | 16,308 | 52 | 4.0% |
| Bunker Hill Village, TX | 3,948 | 52 | 4.0% |
| Jacinto City, TX | 10,544 | 52 | 4.0% |
| Spring Valley Village, TX | 4,294 | 52 | 4.0% |
| Meadows Place, TX | 4,899 | 52 | 4.0% |
| Houston, TX | 2,313,238 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Chicago, IL | 2,699,347 | 55 | 10.0% |
| Montréal, QC | 1,811,008 | n/a | |
| Phoenix, AZ | 1,658,422 | 74 | 48.0% |
| Toronto, ON | 3,013,752 | n/a | |
| Philadelphia, PA | 1,581,531 | 51 | 2.0% |
| Houston, TX | 2,313,238 | 52 | 4.0% |
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