| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 48°F | 64°F | 55°F | 5.3" |
| February | 51°F | 67°F | 58°F | 4.1" |
| March | 56°F | 74°F | 64°F | 8.6" |
| April | 60°F | 78°F | 69°F | 9.7" |
| May | 67°F | 84°F | 75°F | 9.5" |
| June | 74°F | 90°F | 82°F | 7.9" |
| July | 75°F | 90°F | 82°F | 14.6" |
| August | 77°F | 93°F | 84°F | 8.5" |
| September | 74°F | 90°F | 81°F | 6.1" |
| October | 62°F | 82°F | 71°F | 4.7" |
| November | 55°F | 75°F | 64°F | 5.9" |
| December | 48°F | 69°F | 57°F | 3.1" |
| Index | Hillcrest | 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. |
| Alvin, TX | 26,592 | 52 | 4.0% |
| Iowa Colony, TX | 5,305 | 52 | 4.0% |
| Rosharon, TX | 1,515 | 52 | 4.0% |
| Nassau Bay, TX | 4,009 | 52 | 4.0% |
| Bacliff, TX | 11,513 | 52 | 4.0% |
| Hillcrest, TX | 702 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Cherry Valley, AR | 702 | 45 | 10.0% |
| Traver, CA | 702 | 66 | 32.0% |
| Bradley Junction, FL | 702 | 36 | 28.0% |
| Fort White, FL | 702 | 38 | 24.0% |
| Schaller, IA | 702 | 35 | 30.0% |
| Hillcrest, TX | 702 | 52 | 4.0% |
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