| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 88°F | 55°F | 0.8" |
| February | 23°F | 93°F | 59°F | 0.6" |
| March | 30°F | 96°F | 66°F | 3.1" |
| April | 36°F | 102°F | 72°F | 1.3" |
| May | 50°F | 102°F | 79°F | 3.1" |
| June | 61°F | 105°F | 85°F | 2.2" |
| July | 67°F | 106°F | 85°F | 3.1" |
| August | 70°F | 104°F | 86°F | 1.6" |
| September | 55°F | 108°F | 81°F | 2.1" |
| October | 34°F | 97°F | 72°F | 2.5" |
| November | 28°F | 93°F | 64°F | 1.7" |
| December | 21°F | 84°F | 55°F | 1.0" |
| Index | San Antonio | Texas | National |
| Air quality index | 45 | 52 | 50 |
| Pollution index | 24,182,700 | 4,642,916 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 249 |
| Days with moderate air quality | 106 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.310% |
| Benzene | 0.310% |
| Carbon Tetrachloride | 0.080% |
| Lead | 0.140% |
| Mercury | 0.230% |
| City, State | Population | Air Quality Index | National Avg. |
| Castle Hills, TX | 4,367 | 45 | 10% |
| Garden Ridge, TX | 3,730 | 45 | 10% |
| Hollywood Park, TX | 3,257 | 45 | 10% |
| Live Oak, TX | 15,021 | 45 | 10% |
| Schertz, TX | 37,597 | 45 | 10% |
| San Antonio, TX | 1,439,358 | 45 | 10% |
| City, State | Population | Air Quality Index | National Avg. |
| San Diego, CA | 1,374,812 | 61 | 22% |
| Phoenix, AZ | 1,555,324 | 74 | 48% |
| Philadelphia, PA | 1,559,938 | 57 | 14% |
| Dallas, TX | 1,278,433 | 54 | 8% |
| San Jose, CA | 1,009,363 | 48 | 4% |
| San Antonio, TX | 1,439,358 | 45 | 10% |