| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 63°F | 50°F | 5.2" |
| February | 45°F | 67°F | 54°F | 5.4" |
| March | 52°F | 74°F | 61°F | 5.6" |
| April | 60°F | 81°F | 69°F | 4.8" |
| May | 66°F | 86°F | 74°F | 8.3" |
| June | 73°F | 93°F | 82°F | 6.8" |
| July | 75°F | 95°F | 84°F | 1.1" |
| August | 75°F | 97°F | 85°F | 19.0" |
| September | 70°F | 90°F | 79°F | 8.5" |
| October | 62°F | 82°F | 70°F | 2.6" |
| November | 51°F | 71°F | 60°F | 10.3" |
| December | 44°F | 63°F | 52°F | 4.8" |
| Index | Leander | Texas | National |
| Air quality index | 44 | 52 | 42 |
| Pollution index | 1,922,400 | 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 | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bertram, TX | 1,890 | 42 | 16.0% |
| Serenada, TX | 1,415 | 42 | 16.0% |
| Briarcliff, TX | 1,869 | 44 | 12.0% |
| Hudson Bend, TX | 2,438 | 44 | 12.0% |
| Round Rock, TX | 128,812 | 44 | 12.0% |
| Leander, TX | 60,613 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Monterey Park, CA | 60,597 | 72 | 44.0% |
| Lakewood, WA | 60,564 | 30 | 40.0% |
| Marietta, GA | 60,687 | 52 | 4.0% |
| Terre Haute, IN | 60,690 | 45 | 10.0% |
| Wesley Chapel, FL | 60,534 | 43 | 14.0% |
| Leander, TX | 60,613 | 44 | 12.0% |
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