| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 46°F | 71°F | 57°F | 1.8" |
| February | 50°F | 75°F | 61°F | 1.3" |
| March | 57°F | 79°F | 67°F | 2.4" |
| April | 63°F | 85°F | 73°F | 1.8" |
| May | 69°F | 89°F | 78°F | 3.4" |
| June | 74°F | 93°F | 83°F | 2.8" |
| July | 75°F | 94°F | 84°F | 3.6" |
| August | 75°F | 97°F | 85°F | 2.6" |
| September | 73°F | 93°F | 82°F | 5.2" |
| October | 64°F | 88°F | 75°F | 1.9" |
| November | 55°F | 80°F | 67°F | 2.1" |
| December | 49°F | 72°F | 59°F | 1.5" |
| Index | Sinton | Texas | National |
| Air quality index | 42 | 52 | 42 |
| Pollution index | 1,901,300 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 262 |
| Days with moderate air quality | 102 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Edroy, TX | 318 | 30 | 40.0% |
| Rancho Chico, TX | 355 | 42 | 16.0% |
| Woodsboro, TX | 1,441 | 42 | 16.0% |
| Gregory, TX | 2,218 | 42 | 16.0% |
| La Paloma Addition, TX | 361 | 42 | 16.0% |
| Sinton, TX | 5,389 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Fruitland, ID | 5,390 | 36 | 28.0% |
| Val-David, QC | 5,390 | n/a | |
| Goshen, CA | 5,387 | 66 | 32.0% |
| Pinckneyville, IL | 5,391 | 43 | 14.0% |
| Chester, SC | 5,392 | 36 | 28.0% |
| Sinton, TX | 5,389 | 42 | 16.0% |
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