| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 65°F | 53°F | 1.5" |
| February | 48°F | 69°F | 57°F | 1.3" |
| March | 54°F | 75°F | 64°F | 1.9" |
| April | 61°F | 81°F | 70°F | 2.2" |
| May | 67°F | 87°F | 76°F | 2.9" |
| June | 72°F | 92°F | 81°F | 3.0" |
| July | 74°F | 94°F | 82°F | 4.0" |
| August | 74°F | 95°F | 83°F | 4.7" |
| September | 70°F | 91°F | 79°F | 4.0" |
| October | 60°F | 85°F | 71°F | 2.4" |
| November | 53°F | 75°F | 62°F | 1.9" |
| December | 47°F | 67°F | 56°F | 2.8" |
| Index | El Campo | Texas | National |
| Air quality index | 31 | 52 | 42 |
| Pollution index | 1,269,560 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 341 |
| Days with good air quality | 319 |
| Days with moderate air quality | 22 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ganado, TX | 2,127 | 31 | 38.0% |
| Louise, TX | 927 | 31 | 38.0% |
| Hungerford, TX | 88 | 52 | 4.0% |
| Wharton, TX | 8,654 | 52 | 4.0% |
| El Campo, TX | 11,695 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Smyrna, DE | 11,694 | 42 | 16.0% |
| Salem, OH | 11,692 | 42 | 16.0% |
| Tomball, TX | 11,689 | 52 | 4.0% |
| Excelsior Springs, MO | 11,688 | 47 | 6.0% |
| Spearfish, SD | 11,702 | 44 | 12.0% |
| El Campo, TX | 11,695 | 31 | 38.0% |
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