| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 46°F | 65°F | 55°F | 3.1" |
| February | 50°F | 68°F | 58°F | 1.7" |
| March | 57°F | 74°F | 65°F | 2.6" |
| April | 64°F | 80°F | 71°F | 3.0" |
| May | 71°F | 85°F | 77°F | 3.9" |
| June | 77°F | 90°F | 83°F | 3.6" |
| July | 78°F | 91°F | 84°F | 5.5" |
| August | 78°F | 92°F | 85°F | 4.8" |
| September | 73°F | 90°F | 80°F | 5.7" |
| October | 64°F | 84°F | 73°F | 3.4" |
| November | 56°F | 75°F | 65°F | 2.9" |
| December | 49°F | 68°F | 57°F | 2.4" |
| Index | Matagorda | Texas | National |
| Air quality index | 31 | 52 | 42 |
| Pollution index | 793,453 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Matagorda, TX | 519 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Flagler, CO | 519 | 45 | 10.0% |
| Sea Ranch Lakes, FL | 519 | 41 | 18.0% |
| Lamont, IA | 519 | 39 | 22.0% |
| Elnora, IN | 519 | 1 | 98.0% |
| Greens Fork, IN | 519 | 6 | 88.0% |
| Matagorda, TX | 519 | 31 | 38.0% |
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