| 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 | Jonestown | 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. |
| Serenada, TX | 1,415 | 42 | 16.0% |
| The Hills, TX | 2,397 | 44 | 12.0% |
| Cedar Park, TX | 77,181 | 44 | 12.0% |
| Lago Vista, TX | 7,212 | 44 | 12.0% |
| Wells Branch, TX | 12,512 | 44 | 12.0% |
| Jonestown, TX | 2,015 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Bethel Island, CA | 2,015 | 45 | 10.0% |
| Presquille, LA | 2,015 | 41 | 18.0% |
| St. Bonaventure, NY | 2,015 | 9 | 82.0% |
| Wilson-Conococheague, MD | 2,014 | 40 | 20.0% |
| Steep Falls, ME | 2,016 | 40 | 20.0% |
| Jonestown, TX | 2,015 | 44 | 12.0% |
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