| 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 | Santa Clara | 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. |
| China Grove, TX | 1,187 | 45 | 10% |
| Geronimo, TX | 1,124 | 45 | 10% |
| McQueeney, TX | 2,514 | 45 | 10% |
| Randolph AFB, TX | 1,123 | 45 | 10% |
| Selma, TX | 8,866 | 45 | 10% |
| Santa Clara, TX | 807 | 45 | 10% |
| City, State | Population | Air Quality Index | National Avg. |
| Rougemont, NC | 807 | 35 | 30% |
| Diablo, CA | 807 | 43 | 14% |
| Thatcher, UT | 807 | 44 | 12% |
| Livingston, IL | 807 | 60 | 20% |
| Selawik, AK | 807 | 37 | 26% |
| Santa Clara, TX | 807 | 45 | 10% |