| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 66°F | 53°F | 4.2" |
| February | 46°F | 69°F | 56°F | 3.1" |
| March | 52°F | 75°F | 63°F | 4.2" |
| April | 58°F | 81°F | 69°F | 4.2" |
| May | 65°F | 86°F | 76°F | 4.7" |
| June | 73°F | 92°F | 81°F | 4.9" |
| July | 74°F | 93°F | 82°F | 8.6" |
| August | 74°F | 94°F | 83°F | 7.6" |
| September | 70°F | 90°F | 79°F | 6.8" |
| October | 59°F | 84°F | 71°F | 5.3" |
| November | 50°F | 75°F | 62°F | 4.1" |
| December | 45°F | 68°F | 55°F | 4.9" |
| Index | Sour Lake | Texas | National |
| Air quality index | 45 | 52 | 42 |
| Pollution index | 1,521,930 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 234 |
| Days with moderate air quality | 122 |
| Days w/ poor A.Q. for sensitive groups | 8 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Devers, TX | 385 | 45 | 10.0% |
| Bevil Oaks, TX | 1,084 | 45 | 10.0% |
| Silsbee, TX | 6,642 | 45 | 10.0% |
| Hull, TX | 642 | 45 | 10.0% |
| Fannett, TX | 2,176 | 45 | 10.0% |
| Sour Lake, TX | 2,449 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Bono, AR | 2,449 | 45 | 10.0% |
| Aberdeen, ID | 2,449 | 27 | 46.0% |
| Carleton, MI | 2,449 | 1 | 98.0% |
| York, AL | 2,448 | 36 | 28.0% |
| Greenville, DE | 2,448 | 51 | 2.0% |
| Sour Lake, TX | 2,449 | 45 | 10.0% |
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