| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 63°F | 48°F | 0.4" |
| February | 40°F | 69°F | 53°F | 0.9" |
| March | 48°F | 76°F | 61°F | 1.5" |
| April | 56°F | 82°F | 68°F | 1.9" |
| May | 64°F | 87°F | 74°F | 2.8" |
| June | 71°F | 95°F | 82°F | 2.8" |
| July | 73°F | 97°F | 84°F | 0.5" |
| August | 73°F | 98°F | 85°F | 0.8" |
| September | 67°F | 91°F | 78°F | 1.6" |
| October | 56°F | 83°F | 69°F | 1.4" |
| November | 47°F | 72°F | 58°F | 1.5" |
| December | 38°F | 64°F | 49°F | 0.5" |
| Index | Llano | Texas | National |
| Air quality index | 42 | 52 | 42 |
| Pollution index | 798,696 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 284 |
| Days with moderate air quality | 79 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Buchanan Dam, TX | 1,411 | 42 | 16.0% |
| Buchanan Lake Village, TX | 808 | 42 | 16.0% |
| Kingsland, TX | 7,177 | 44 | 12.0% |
| Llano, TX | 3,490 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Brookland, AR | 3,491 | 45 | 10.0% |
| Carman, MB | 3,491 | n/a | |
| Bunk Foss, WA | 3,488 | 45 | 10.0% |
| West End-Cobb Town, AL | 3,492 | 38 | 24.0% |
| Kensington Park, FL | 3,492 | 38 | 24.0% |
| Llano, TX | 3,490 | 42 | 16.0% |
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