| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 68°F | 52°F | 0.8" |
| February | 43°F | 74°F | 57°F | 0.5" |
| March | 51°F | 81°F | 65°F | 1.2" |
| April | 59°F | 87°F | 72°F | 2.3" |
| May | 66°F | 91°F | 78°F | 4.0" |
| June | 73°F | 97°F | 85°F | 2.2" |
| July | 76°F | 98°F | 86°F | 1.9" |
| August | 76°F | 99°F | 87°F | 2.9" |
| September | 70°F | 93°F | 81°F | 3.3" |
| October | 60°F | 86°F | 72°F | 1.8" |
| November | 49°F | 76°F | 61°F | 0.8" |
| December | 40°F | 67°F | 52°F | 0.8" |
| Index | Del Rio | Texas | National |
| Air quality index | 25 | 52 | 42 |
| Pollution index | 568,521 | 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 | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Laughlin AFB, TX | 2,016 | 25 | 50.0% |
| Val Verde Park, TX | 3,891 | 25 | 50.0% |
| Cienegas Terrace, TX | 2,694 | 25 | 50.0% |
| Lake View, TX | 69 | 25 | 50.0% |
| Del Rio, TX | 36,754 | 25 | 50.0% |
| City | Population | Air Quality Index | National Avg. |
| Campbell River, BC | 36,740 | n/a | |
| San Juan Capistrano, CA | 36,776 | 89 | 78.0% |
| El Mirage, AZ | 36,729 | 74 | 48.0% |
| Oildale, CA | 36,792 | 67 | 34.0% |
| Oswego, IL | 36,709 | 0 | 100.0% |
| Del Rio, TX | 36,754 | 25 | 50.0% |