| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 66°F | 50°F | 2.9" |
| February | 41°F | 71°F | 54°F | 1.7" |
| March | 48°F | 77°F | 62°F | 3.9" |
| April | 55°F | 83°F | 69°F | 3.2" |
| May | 63°F | 89°F | 75°F | 6.1" |
| June | 71°F | 95°F | 82°F | 3.2" |
| July | 72°F | 98°F | 84°F | 2.9" |
| August | 73°F | 99°F | 85°F | 2.6" |
| September | 67°F | 94°F | 79°F | 4.8" |
| October | 56°F | 86°F | 69°F | 4.1" |
| November | 47°F | 76°F | 60°F | 2.4" |
| December | 39°F | 67°F | 52°F | 2.5" |
| Index | Elgin | Texas | National |
| Air quality index | 44 | 52 | 42 |
| Pollution index | 692,760 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 249 |
| Days with moderate air quality | 114 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hornsby Bend, TX | 8,553 | 44 | 12.0% |
| Coupland, TX | 377 | 44 | 12.0% |
| McDade, TX | 1,285 | 44 | 12.0% |
| Hutto, TX | 26,778 | 44 | 12.0% |
| Camp Swift, TX | 6,529 | 44 | 12.0% |
| Elgin, TX | 10,231 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| East Stroudsburg, PA | 10,232 | 34 | 32.0% |
| Browns Mills, NJ | 10,228 | 41 | 18.0% |
| Golden Hills, CA | 10,234 | 67 | 34.0% |
| Shasta Lake, CA | 10,235 | 42 | 16.0% |
| Keokuk, IA | 10,225 | 29 | 42.0% |
| Elgin, TX | 10,231 | 44 | 12.0% |
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