| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 65°F | 53°F | 3.7" |
| February | 48°F | 69°F | 57°F | 2.3" |
| March | 54°F | 75°F | 64°F | 3.5" |
| April | 61°F | 81°F | 70°F | 4.7" |
| May | 68°F | 87°F | 76°F | 6.5" |
| June | 73°F | 93°F | 82°F | 3.8" |
| July | 75°F | 94°F | 83°F | 5.2" |
| August | 75°F | 95°F | 84°F | 6.9" |
| September | 71°F | 90°F | 79°F | 3.5" |
| October | 61°F | 84°F | 71°F | 4.6" |
| November | 53°F | 75°F | 63°F | 2.5" |
| December | 47°F | 67°F | 56°F | 3.1" |
| Index | Wallis | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 1,269,560 | 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 | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Kendleton, TX | 327 | 52 | 4.0% |
| San Felipe, TX | 1,108 | 52 | 4.0% |
| Brookshire, TX | 5,601 | 52 | 4.0% |
| Orchard, TX | 166 | 52 | 4.0% |
| Sealy, TX | 6,439 | 52 | 4.0% |
| Wallis, TX | 1,755 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Kaibito, AZ | 1,755 | 45 | 10.0% |
| Portola, CA | 1,755 | 44 | 12.0% |
| Prudenville, MI | 1,755 | 36 | 28.0% |
| Decatur, MS | 1,755 | 36 | 28.0% |
| Corvallis, MT | 1,755 | 40 | 20.0% |
| Wallis, TX | 1,755 | 52 | 4.0% |
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