| 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 | Hargill | 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. |
| César Chávez, TX | 709 | 42 | 16.0% |
| La Blanca, TX | 2,502 | 42 | 16.0% |
| San Carlos, TX | 3,945 | 42 | 16.0% |
| Lyford, TX | 2,536 | 42 | 16.0% |
| Edcouch, TX | 3,314 | 42 | 16.0% |
| Hargill, TX | 1,083 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Essex, IL | 1,083 | 0 | 100.0% |
| Truman, MN | 1,083 | 15 | 70.0% |
| Centreville-Wareham-Trinity, NL | 1,083 | n/a | |
| Avilla, AR | 1,082 | 45 | 10.0% |
| Gerber, CA | 1,084 | 41 | 18.0% |
| Hargill, TX | 1,083 | 42 | 16.0% |
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