| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 66°F | 52°F | 1.2" |
| February | 44°F | 72°F | 56°F | 1.8" |
| March | 52°F | 78°F | 64°F | 2.0" |
| April | 59°F | 85°F | 71°F | 3.3" |
| May | 66°F | 90°F | 77°F | 8.6" |
| June | 72°F | 95°F | 83°F | 2.3" |
| July | 73°F | 96°F | 84°F | 1.9" |
| August | 74°F | 98°F | 85°F | 2.7" |
| September | 69°F | 92°F | 79°F | 4.8" |
| October | 60°F | 85°F | 71°F | 1.9" |
| November | 51°F | 74°F | 61°F | 2.0" |
| December | 43°F | 66°F | 53°F | 1.2" |
| Index | Crystal City | Texas | National |
| Air quality index | 25 | 52 | 42 |
| Pollution index | 233,769 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 339 |
| Days with good air quality | 287 |
| Days with moderate air quality | 51 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Brundage, TX | 0 | 25 | 50.0% |
| Carrizo Hill, TX | 1,479 | 25 | 50.0% |
| Carrizo Springs, TX | 5,421 | 25 | 50.0% |
| Amaya, TX | 24 | 25 | 50.0% |
| Loma Grande, TX | 318 | 25 | 50.0% |
| Crystal City, TX | 7,256 | 25 | 50.0% |
| City | Population | Air Quality Index | National Avg. |
| Pleasantville, NY | 7,256 | 43 | 14.0% |
| Kahaluu-Keauhou, HI | 7,258 | 16 | 68.0% |
| Calipatria, CA | 7,260 | 58 | 16.0% |
| McNab/Braeside, ON | 7,260 | n/a | |
| Kill Devil Hills, NC | 7,249 | 40 | 20.0% |
| Crystal City, TX | 7,256 | 25 | 50.0% |
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