| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 65°F | 52°F | 3.0" |
| February | 46°F | 69°F | 56°F | 1.5" |
| March | 53°F | 76°F | 63°F | 4.0" |
| April | 60°F | 82°F | 70°F | 2.9" |
| May | 66°F | 88°F | 76°F | 5.9" |
| June | 73°F | 95°F | 83°F | 3.4" |
| July | 75°F | 97°F | 85°F | 3.0" |
| August | 76°F | 99°F | 86°F | 2.2" |
| September | 71°F | 93°F | 80°F | 4.5" |
| October | 61°F | 84°F | 71°F | 3.9" |
| November | 52°F | 74°F | 62°F | 2.4" |
| December | 44°F | 65°F | 53°F | 2.5" |
| Index | Holly | Austin | Texas |
| Air quality index | 44 | 44 | 52 |
| Pollution index | 713,830 | 713,830 | 2,009,300 |
| 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 | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Volente, TX | 925 | 44 | 12.0% |
| Mountain City, TX | 536 | 44 | 12.0% |
| Bear Creek, TX | 460 | 44 | 12.0% |
| Hays, TX | 141 | 44 | 12.0% |
| Rollingwood, TX | 1,331 | 44 | 12.0% |
| Austin, TX | 965,872 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Jacksonville, FL | 902,488 | 43 | 14.0% |
| San Jose, CA | 1,029,409 | 43 | 14.0% |
| Fort Worth, TX | 892,221 | 51 | 2.0% |
| Columbus, OH | 889,079 | 46 | 8.0% |
| Edmonton, AB | 1,053,392 | n/a | |
| Austin, TX | 965,872 | 44 | 12.0% |
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