| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 45°F | 61°F | 53°F | 9.4" |
| February | 47°F | 66°F | 55°F | 5.5" |
| March | 54°F | 74°F | 64°F | 11.4" |
| April | 57°F | 78°F | 67°F | 4.6" |
| May | 67°F | 84°F | 75°F | 7.8" |
| June | 73°F | 90°F | 81°F | 11.6" |
| July | 75°F | 91°F | 82°F | 15.7" |
| August | 75°F | 93°F | 84°F | 8.5" |
| September | 71°F | 91°F | 81°F | 7.1" |
| October | 60°F | 83°F | 71°F | 1.2" |
| November | 52°F | 74°F | 63°F | 1.8" |
| December | 43°F | 66°F | 54°F | 1.5" |
| Index | St. Hedwig | Texas | National |
| Air quality index | 49 | 52 | 42 |
| Pollution index | 24,182,700 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 196 |
| Days with moderate air quality | 163 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.310% |
| Benzene | 0.310% |
| Carbon Tetrachloride | 0.080% |
| Lead | 0.140% |
| Mercury | 0.230% |
| City | Population | Air Quality Index | National Avg. |
| Stockdale, TX | 1,353 | 49 | 2.0% |
| Terrell Hills, TX | 5,409 | 49 | 2.0% |
| Converse, TX | 27,582 | 49 | 2.0% |
| Marion, TX | 886 | 49 | 2.0% |
| Zuehl, TX | 515 | 49 | 2.0% |
| St. Hedwig, TX | 2,474 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Carthage, IL | 2,474 | 29 | 42.0% |
| Roaring Spring, PA | 2,475 | 41 | 18.0% |
| Middletown, IN | 2,472 | 42 | 16.0% |
| Winthrop, ME | 2,476 | 28 | 44.0% |
| New London, OH | 2,476 | 43 | 14.0% |
| St. Hedwig, TX | 2,474 | 49 | 2.0% |
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