| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 64°F | 52°F | 6.8" |
| February | 48°F | 68°F | 56°F | 4.7" |
| March | 54°F | 75°F | 63°F | 8.5" |
| April | 60°F | 80°F | 70°F | 5.1" |
| May | 66°F | 86°F | 75°F | 13.3" |
| June | 71°F | 92°F | 80°F | 6.1" |
| July | 72°F | 92°F | 81°F | 7.3" |
| August | 73°F | 94°F | 82°F | 5.9" |
| September | 70°F | 89°F | 78°F | 6.8" |
| October | 59°F | 83°F | 70°F | 12.5" |
| November | 52°F | 74°F | 61°F | 6.4" |
| December | 46°F | 65°F | 55°F | 6.3" |
| Index | Iowa Colony | 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. |
| Bonney, TX | 249 | 52 | 4.0% |
| Hillcrest, TX | 719 | 52 | 4.0% |
| Pearland, TX | 130,314 | 52 | 4.0% |
| South Houston, TX | 17,971 | 52 | 4.0% |
| Sugar Land, TX | 123,135 | 52 | 4.0% |
| Iowa Colony, TX | 5,492 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Dulles Town Center, VA | 5,492 | 47 | 6.0% |
| Linton, IN | 5,491 | 1 | 98.0% |
| Tillamook, OR | 5,493 | 32 | 36.0% |
| Mount Carmel, TN | 5,493 | 45 | 10.0% |
| Jeanerette, LA | 5,494 | 41 | 18.0% |
| Iowa Colony, TX | 5,492 | 52 | 4.0% |
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