| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 65°F | 52°F | 6.4" |
| February | 45°F | 70°F | 56°F | 4.4" |
| March | 53°F | 76°F | 63°F | 5.9" |
| April | 59°F | 82°F | 70°F | 6.6" |
| May | 66°F | 87°F | 76°F | 8.8" |
| June | 72°F | 94°F | 82°F | 8.0" |
| July | 74°F | 95°F | 83°F | 10.0" |
| August | 74°F | 97°F | 85°F | 11.7" |
| September | 69°F | 91°F | 79°F | 9.4" |
| October | 60°F | 84°F | 71°F | 9.2" |
| November | 51°F | 74°F | 61°F | 5.6" |
| December | 44°F | 66°F | 54°F | 4.9" |
| Index | Selma | Texas | National |
| Air quality index | 49 | 52 | 42 |
| Pollution index | 24,182,700 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 196 |
| Days with moderate air quality | 163 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.310% |
| Benzene | 0.310% |
| Carbon Tetrachloride | 0.080% |
| Lead | 0.140% |
| Mercury | 0.230% |
| City | Population | Air Quality Index | National Avg. |
| Bulverde, TX | 5,279 | 49 | 2.0% |
| Balcones Heights, TX | 3,128 | 49 | 2.0% |
| Schertz, TX | 42,433 | 49 | 2.0% |
| Windcrest, TX | 5,854 | 49 | 2.0% |
| Garden Ridge, TX | 4,054 | 49 | 2.0% |
| Selma, TX | 11,241 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Camp Verde, AZ | 11,241 | 43 | 14.0% |
| Burkburnett, TX | 11,241 | 26 | 48.0% |
| Travilah, MD | 11,239 | 47 | 6.0% |
| Hudson, FL | 11,243 | 43 | 14.0% |
| Pearsall, TX | 11,243 | 49 | 2.0% |
| Selma, TX | 11,241 | 49 | 2.0% |
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