| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 64°F | 48°F | 4.5" |
| February | 40°F | 68°F | 52°F | 0.6" |
| March | 46°F | 73°F | 58°F | 3.6" |
| April | 56°F | 82°F | 67°F | 3.2" |
| May | 62°F | 86°F | 73°F | 15.1" |
| June | 71°F | 93°F | 81°F | 16.6" |
| July | 71°F | 96°F | 83°F | 8.2" |
| August | 72°F | 97°F | 84°F | 5.6" |
| September | 68°F | 91°F | 78°F | 7.6" |
| October | 58°F | 84°F | 70°F | 6.2" |
| November | 46°F | 71°F | 57°F | 8.9" |
| December | 40°F | 64°F | 50°F | 4.4" |
| Index | Blanco | Texas | National |
| Air quality index | 44 | 52 | 42 |
| Pollution index | 1,877,920 | 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 | 0.001% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Stonewall, TX | 607 | 44 | 12.0% |
| Johnson City, TX | 1,780 | 44 | 12.0% |
| Canyon Lake, TX | 26,338 | 49 | 2.0% |
| Blanco, TX | 2,670 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Kulpmont, PA | 2,670 | 42 | 16.0% |
| Irvine, KY | 2,669 | 33 | 34.0% |
| Rogers City, MI | 2,669 | 32 | 36.0% |
| Stroud, OK | 2,669 | 36 | 28.0% |
| Verona, PA | 2,669 | 56 | 12.0% |
| Blanco, TX | 2,670 | 44 | 12.0% |
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