| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 59°F | 47°F | 6.5" |
| February | 43°F | 65°F | 52°F | 3.7" |
| March | 51°F | 74°F | 60°F | 12.3" |
| April | 54°F | 78°F | 64°F | 2.2" |
| May | 63°F | 83°F | 72°F | 15.7" |
| June | 71°F | 91°F | 80°F | 16.5" |
| July | 73°F | 95°F | 82°F | 6.5" |
| August | 74°F | 97°F | 84°F | 17.3" |
| September | 70°F | 96°F | 81°F | 2.8" |
| October | 57°F | 85°F | 69°F | 4.3" |
| November | 50°F | 75°F | 60°F | 7.3" |
| December | 37°F | 65°F | 49°F | 0.8" |
| Index | Chilton | Texas | National |
| Air quality index | 38 | 52 | 42 |
| Pollution index | 4,190,870 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 329 |
| Days with moderate air quality | 36 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.060% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Hewitt, TX | 14,705 | 38 | 24.0% |
| Woodway, TX | 8,936 | 38 | 24.0% |
| Rosebud, TX | 1,419 | 38 | 24.0% |
| Lorena, TX | 1,822 | 38 | 24.0% |
| Bruceville-Eddy, TX | 1,675 | 38 | 24.0% |
| Chilton, TX | 671 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Geyserville, CA | 671 | 34 | 32.0% |
| Stonington, IL | 671 | 44 | 12.0% |
| Rose City, MI | 671 | 26 | 48.0% |
| Clear Lake, MN | 671 | 32 | 36.0% |
| Jasper, MN | 671 | 36 | 28.0% |
| Chilton, TX | 671 | 38 | 24.0% |
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