| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 47°F | 65°F | 54°F | 6.3" |
| February | 50°F | 66°F | 57°F | 3.5" |
| March | 55°F | 74°F | 64°F | 9.6" |
| April | 58°F | 77°F | 67°F | 3.4" |
| May | 66°F | 84°F | 74°F | 7.0" |
| June | 73°F | 90°F | 81°F | 2.9" |
| July | 74°F | 89°F | 81°F | 8.7" |
| August | 74°F | 93°F | 82°F | 3.2" |
| September | 72°F | 91°F | 80°F | 4.1" |
| October | 60°F | 83°F | 70°F | 4.2" |
| November | 53°F | 75°F | 63°F | 3.9" |
| December | 46°F | 69°F | 57°F | 2.4" |
| Index | Angleton | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 6,628,750 | 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 | 0.020% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.660% |
| Lead | 0.060% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Brazoria, TX | 3,077 | 52 | 4.0% |
| Jones Creek, TX | 1,986 | 52 | 4.0% |
| Surfside Beach, TX | 585 | 52 | 4.0% |
| Liverpool, TX | 522 | 52 | 4.0% |
| Clute, TX | 11,655 | 52 | 4.0% |
| Angleton, TX | 19,371 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Matteson, IL | 19,374 | 55 | 10.0% |
| Johnstown, PA | 19,381 | 39 | 22.0% |
| South Burlington, VT | 19,359 | 37 | 26.0% |
| Yorkville, IL | 19,386 | 0 | 100.0% |
| Langley Park, MD | 19,391 | 47 | 6.0% |
| Angleton, TX | 19,371 | 52 | 4.0% |
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