| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 63°F | 50°F | 4.6" |
| February | 43°F | 66°F | 53°F | 3.4" |
| March | 50°F | 74°F | 61°F | 3.9" |
| April | 57°F | 81°F | 68°F | 3.7" |
| May | 64°F | 86°F | 74°F | 5.5" |
| June | 71°F | 93°F | 81°F | 4.1" |
| July | 73°F | 94°F | 83°F | 3.6" |
| August | 73°F | 96°F | 83°F | 4.1" |
| September | 68°F | 91°F | 78°F | 3.1" |
| October | 57°F | 82°F | 68°F | 4.3" |
| November | 48°F | 72°F | 59°F | 3.8" |
| December | 42°F | 63°F | 51°F | 3.8" |
| Index | Chester | Texas | National |
| Air quality index | 45 | 52 | 42 |
| Pollution index | 2,736,170 | 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 | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Woodville, TX | 2,849 | 45 | 10.0% |
| Colmesneil, TX | 733 | 45 | 10.0% |
| Corrigan, TX | 1,804 | 45 | 10.0% |
| Pleasant Hill, TX | 771 | 45 | 10.0% |
| Chester, TX | 332 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Bayard, IA | 332 | 37 | 26.0% |
| Rowley, IA | 332 | 39 | 22.0% |
| Copeland, KS | 332 | 15 | 70.0% |
| Salt Lick, KY | 332 | 33 | 34.0% |
| Smithland, KY | 332 | 44 | 12.0% |
| Chester, TX | 332 | 45 | 10.0% |
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