| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 66°F | 52°F | 5.5" |
| February | 46°F | 71°F | 57°F | 4.0" |
| March | 53°F | 77°F | 64°F | 6.7" |
| April | 60°F | 83°F | 71°F | 6.2" |
| May | 67°F | 88°F | 77°F | 11.9" |
| June | 73°F | 94°F | 83°F | 6.8" |
| July | 75°F | 96°F | 84°F | 6.1" |
| August | 75°F | 97°F | 86°F | 7.1" |
| September | 70°F | 91°F | 80°F | 9.0" |
| October | 61°F | 84°F | 72°F | 10.0" |
| November | 52°F | 75°F | 62°F | 7.6" |
| December | 44°F | 66°F | 54°F | 4.7" |
| Index | Somerset | 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. |
| Poteet, TX | 3,462 | 49 | 2.0% |
| Castroville, TX | 3,097 | 49 | 2.0% |
| Lytle, TX | 2,429 | 49 | 2.0% |
| Lackland AFB, TX | 5,679 | 49 | 2.0% |
| Devine, TX | 4,829 | 49 | 2.0% |
| Somerset, TX | 1,821 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Perry Park, CO | 1,821 | 45 | 10.0% |
| Westwood Shores, TX | 1,821 | 52 | 4.0% |
| Saint-Damien-de-Buckland, QC | 1,821 | n/a | |
| North Liberty, IN | 1,822 | 42 | 16.0% |
| Masonville, KY | 1,822 | 43 | 14.0% |
| Somerset, TX | 1,821 | 49 | 2.0% |
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