| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 66°F | 54°F | 3.6" |
| February | 46°F | 70°F | 57°F | 2.9" |
| March | 52°F | 76°F | 64°F | 3.6" |
| April | 59°F | 82°F | 70°F | 4.3" |
| May | 66°F | 88°F | 76°F | 5.5" |
| June | 73°F | 94°F | 83°F | 4.6" |
| July | 75°F | 95°F | 84°F | 5.1" |
| August | 75°F | 96°F | 84°F | 7.0" |
| September | 70°F | 92°F | 80°F | 4.2" |
| October | 59°F | 85°F | 71°F | 6.1" |
| November | 51°F | 76°F | 62°F | 3.4" |
| December | 45°F | 67°F | 55°F | 4.1" |
| Index | Sheldon | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 2,906,860 | 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 | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.001% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Atascocita, TX | 81,860 | 52 | 4.0% |
| Mont Belvieu, TX | 6,180 | 52 | 4.0% |
| South Houston, TX | 17,522 | 52 | 4.0% |
| Deer Park, TX | 33,599 | 52 | 4.0% |
| Pasadena, TX | 152,537 | 52 | 4.0% |
| Sheldon, TX | 2,179 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Armada, MI | 2,179 | 56 | 12.0% |
| Langley, SC | 2,179 | 47 | 6.0% |
| Fifth Street, TX | 2,179 | 52 | 4.0% |
| Whitney, TX | 2,179 | 38 | 24.0% |
| East Kootenay B, BC | 2,179 | n/a | |
| Sheldon, TX | 2,179 | 52 | 4.0% |
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