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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 50°F | 73°F | 60°F | 2.4" |
| February | 55°F | 78°F | 65°F | 2.8" |
| March | 61°F | 84°F | 71°F | 4.3" |
| April | 67°F | 90°F | 77°F | 2.4" |
| May | 72°F | 93°F | 81°F | 6.3" |
| June | 76°F | 98°F | 85°F | 7.0" |
| July | 77°F | 98°F | 86°F | 7.3" |
| August | 77°F | 100°F | 87°F | 9.5" |
| September | 73°F | 94°F | 82°F | 8.4" |
| October | 66°F | 90°F | 77°F | 6.6" |
| November | 58°F | 82°F | 69°F | 4.4" |
| December | 53°F | 75°F | 63°F | 2.2" |
| Index | San Isidro | 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. |
| Delmita, TX | 145 | 42 | 16.0% |
| San Isidro, TX | 103 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Broomtown, AL | 103 | 39 | 22.0% |
| Fargo, AR | 103 | 45 | 10.0% |
| Sedalia, CO | 103 | 58 | 16.0% |
| Manassas, GA | 103 | 39 | 22.0% |
| Matthews, GA | 103 | 47 | 6.0% |
| San Isidro, TX | 103 | 42 | 16.0% |
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