| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 46°F | 72°F | 58°F | 1.2" |
| February | 50°F | 75°F | 61°F | 4.0" |
| March | 57°F | 85°F | 69°F | 1.6" |
| April | 65°F | 92°F | 77°F | 11.0" |
| May | 71°F | 95°F | 82°F | 5.0" |
| June | 75°F | 100°F | 86°F | 3.5" |
| July | 76°F | 99°F | 87°F | 7.2" |
| August | 76°F | 100°F | 87°F | 12.0" |
| September | 72°F | 94°F | 82°F | 7.8" |
| October | 63°F | 88°F | 75°F | 4.1" |
| November | 54°F | 81°F | 66°F | 1.2" |
| December | 48°F | 70°F | 57°F | 4.5" |
| Index | San Ygnacio | Texas | National |
| Air quality index | 41 | 52 | 42 |
| Pollution index | 2,768,160 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 258 |
| Days with moderate air quality | 106 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Medina, TX | 4,599 | 41 | 18.0% |
| Siesta Shores, TX | 1,740 | 41 | 18.0% |
| Ramireno, TX | 0 | 41 | 18.0% |
| Falcon Mesa, TX | 57 | 41 | 18.0% |
| Zapata, TX | 5,567 | 41 | 18.0% |
| San Ygnacio, TX | 484 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Mokelumne Hill, CA | 484 | 39 | 22.0% |
| Yatesville, GA | 484 | 38 | 24.0% |
| Sun River Terrace, IL | 484 | 55 | 10.0% |
| Pennock, MN | 484 | 32 | 36.0% |
| Vermillion, MN | 484 | 37 | 26.0% |
| San Ygnacio, TX | 484 | 41 | 18.0% |
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