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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 51°F | 74°F | 61°F | 1.0" |
| February | 56°F | 78°F | 65°F | 0.8" |
| March | 62°F | 84°F | 71°F | 1.0" |
| April | 68°F | 89°F | 77°F | 1.5" |
| May | 73°F | 93°F | 81°F | 2.1" |
| June | 77°F | 97°F | 85°F | 1.8" |
| July | 78°F | 98°F | 86°F | 3.3" |
| August | 78°F | 99°F | 87°F | 1.8" |
| September | 75°F | 95°F | 83°F | 4.6" |
| October | 68°F | 90°F | 78°F | 1.6" |
| November | 60°F | 82°F | 70°F | 1.1" |
| December | 54°F | 75°F | 63°F | 1.4" |
| Index | San Juan | Texas | National |
| Air quality index | 42 | 52 | 42 |
| Pollution index | 7,136,530 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 243 |
| Days with moderate air quality | 120 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Alton, TX | 17,683 | 42 | 16.0% |
| Donna, TX | 16,381 | 42 | 16.0% |
| Mercedes, TX | 16,561 | 42 | 16.0% |
| Scissors, TX | 3,511 | 42 | 16.0% |
| Indian Hills, TX | 2,600 | 42 | 16.0% |
| San Juan, TX | 36,759 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Clermont, FL | 36,757 | 39 | 22.0% |
| Campbell River, BC | 36,740 | n/a | |
| Waxahachie, TX | 36,735 | 51 | 2.0% |
| Texarkana, TX | 36,733 | 39 | 22.0% |
| New Albany, IN | 36,730 | 49 | 2.0% |
| San Juan, TX | 36,759 | 42 | 16.0% |
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