| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 45°F | 66°F | 54°F | 2.9" |
| February | 49°F | 69°F | 58°F | 4.5" |
| March | 57°F | 75°F | 65°F | 5.9" |
| April | 63°F | 80°F | 71°F | 4.7" |
| May | 69°F | 85°F | 76°F | 10.5" |
| June | 74°F | 90°F | 82°F | 5.0" |
| July | 76°F | 92°F | 83°F | 7.6" |
| August | 76°F | 93°F | 84°F | 13.4" |
| September | 72°F | 89°F | 80°F | 7.6" |
| October | 64°F | 84°F | 73°F | 9.0" |
| November | 55°F | 75°F | 64°F | 4.4" |
| December | 49°F | 67°F | 57°F | 4.6" |
| Index | Port O'Connor | Texas | National |
| Air quality index | 31 | 52 | 42 |
| Pollution index | 354,484 | 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Port Lavaca, TX | 12,015 | 31 | 38.0% |
| Port O'Connor, TX | 1,139 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Rison, AR | 1,139 | 32 | 36.0% |
| Lake Riverside, CA | 1,139 | 89 | 78.0% |
| Fowler, CO | 1,139 | 20 | 60.0% |
| Converse, IN | 1,139 | 37 | 26.0% |
| Morristown, IN | 1,139 | 28 | 44.0% |
| Port O'Connor, TX | 1,139 | 31 | 38.0% |
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