| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 59°F | 45°F | 2.2" |
| February | 38°F | 63°F | 49°F | 1.8" |
| March | 47°F | 72°F | 59°F | 3.2" |
| April | 55°F | 79°F | 66°F | 4.4" |
| May | 62°F | 85°F | 73°F | 4.2" |
| June | 72°F | 94°F | 83°F | 4.4" |
| July | 75°F | 97°F | 86°F | 2.2" |
| August | 75°F | 99°F | 86°F | 2.4" |
| September | 66°F | 91°F | 78°F | 3.1" |
| October | 55°F | 81°F | 67°F | 3.5" |
| November | 45°F | 70°F | 57°F | 2.8" |
| December | 36°F | 59°F | 47°F | 2.2" |
| Index | Haslet | Texas | National |
| Air quality index | 51 | 52 | 42 |
| Pollution index | 1,399,310 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 181 |
| Days with moderate air quality | 155 |
| Days w/ poor A.Q. for sensitive groups | 28 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Lakeside town (San Patricio County), TX | 307 | 33 | 34.0% |
| Pelican Bay, TX | 1,618 | 33 | 34.0% |
| Lakeside, TX | 1,636 | 33 | 34.0% |
| River Oaks, TX | 7,653 | 33 | 34.0% |
| Boyd, TX | 1,375 | 33 | 34.0% |
| Haslet, TX | 2,276 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Lebanon Junction, KY | 2,276 | 39 | 22.0% |
| Cabin John, MD | 2,276 | 47 | 6.0% |
| Lexington, MN | 2,276 | 46 | 8.0% |
| Sumrall, MS | 2,276 | 35 | 30.0% |
| Kimball, NE | 2,276 | 19 | 62.0% |
| Haslet, TX | 2,276 | 51 | 2.0% |
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