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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 66°F | 53°F | 4.2" |
| February | 46°F | 69°F | 56°F | 3.1" |
| March | 52°F | 75°F | 63°F | 4.2" |
| April | 58°F | 81°F | 69°F | 4.2" |
| May | 65°F | 86°F | 76°F | 4.7" |
| June | 73°F | 92°F | 81°F | 4.9" |
| July | 74°F | 93°F | 82°F | 8.6" |
| August | 74°F | 94°F | 83°F | 7.6" |
| September | 70°F | 90°F | 79°F | 6.8" |
| October | 59°F | 84°F | 71°F | 5.3" |
| November | 50°F | 75°F | 62°F | 4.1" |
| December | 45°F | 68°F | 55°F | 4.9" |
| Index | Port Arthur | Texas | National |
| Air quality index | 45 | 52 | 42 |
| Pollution index | 2,270,020 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 234 |
| Days with moderate air quality | 122 |
| Days w/ poor A.Q. for sensitive groups | 8 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Beaumont, TX | 120,037 | 45 | 10.0% |
| Nederland, TX | 17,748 | 45 | 10.0% |
| Bridge City, TX | 8,123 | 45 | 10.0% |
| Orange, TX | 18,926 | 45 | 10.0% |
| Central Gardens, TX | 3,760 | 45 | 10.0% |
| Port Arthur, TX | 56,362 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Gilroy, CA | 56,371 | 37 | 26.0% |
| Rocky Mount, NC | 56,346 | 36 | 28.0% |
| Lenexa, KS | 56,388 | 47 | 6.0% |
| Bel Air South, MD | 56,444 | 46 | 8.0% |
| West Haven, CT | 56,258 | 41 | 18.0% |
| Port Arthur, TX | 56,362 | 45 | 10.0% |
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