| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 56°F | 42°F | 0.7" |
| February | 36°F | 58°F | 45°F | 1.4" |
| March | 45°F | 70°F | 56°F | 2.6" |
| April | 54°F | 78°F | 65°F | 1.9" |
| May | 60°F | 83°F | 70°F | 1.6" |
| June | 70°F | 93°F | 81°F | 2.7" |
| July | 73°F | 96°F | 84°F | 2.4" |
| August | 72°F | 98°F | 84°F | 0.8" |
| September | 63°F | 87°F | 74°F | 1.6" |
| October | 51°F | 75°F | 62°F | 2.2" |
| November | 43°F | 68°F | 55°F | 0.4" |
| December | 34°F | 55°F | 43°F | 0.8" |
| Index | Sunset CDP (Starr County) | Texas | National |
| Air quality index | 26 | 52 | 42 |
| Pollution index | 967,579 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 345 |
| Days with good air quality | 308 |
| Days with moderate air quality | 37 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Chico, TX | 1,166 | 26 | 48.0% |
| Bellevue, TX | 443 | 26 | 48.0% |
| Bowie, TX | 5,075 | 26 | 48.0% |
| Alvord, TX | 1,104 | 26 | 48.0% |
| Sunset, TX | 651 | 26 | 48.0% |
| Sunset CDP (Starr County), TX | 15 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Nikolski, AK | 15 | 31 | 38.0% |
| Scott, AR | 15 | 45 | 10.0% |
| Eagleville, CA | 15 | 29 | 42.0% |
| Frederick, KS | 15 | 40 | 20.0% |
| Concord, KY | 15 | 14 | 72.0% |
| Sunset CDP (Starr County), TX | 15 | 26 | 48.0% |
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