| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 63°F | 52°F | 2.4" |
| February | 46°F | 67°F | 55°F | 2.9" |
| March | 53°F | 74°F | 62°F | 3.6" |
| April | 60°F | 80°F | 69°F | 2.5" |
| May | 67°F | 86°F | 75°F | 5.1" |
| June | 73°F | 93°F | 82°F | 2.7" |
| July | 75°F | 94°F | 83°F | 1.7" |
| August | 75°F | 96°F | 84°F | 4.8" |
| September | 70°F | 90°F | 79°F | 2.9" |
| October | 60°F | 83°F | 70°F | 2.7" |
| November | 52°F | 73°F | 61°F | 3.1" |
| December | 46°F | 65°F | 54°F | 3.1" |
| Index | Bellville | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 898,232 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Industry, TX | 275 | 52 | 4.0% |
| Brazos Country, TX | 619 | 52 | 4.0% |
| Pine Island, TX | 1,483 | 52 | 4.0% |
| San Felipe, TX | 1,108 | 52 | 4.0% |
| Brenham, TX | 17,297 | 52 | 4.0% |
| Bellville, TX | 4,228 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Wayland, MI | 4,227 | 39 | 22.0% |
| Bristow, OK | 4,226 | 45 | 10.0% |
| China Grove, NC | 4,225 | 40 | 20.0% |
| Orangetree, FL | 4,231 | 34 | 32.0% |
| Kewaskum, WI | 4,224 | 36 | 28.0% |
| Bellville, TX | 4,228 | 52 | 4.0% |
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