| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 61°F | 46°F | 4.7" |
| February | 38°F | 68°F | 51°F | 4.9" |
| March | 44°F | 75°F | 58°F | 2.7" |
| April | 53°F | 81°F | 65°F | 4.3" |
| May | 60°F | 86°F | 72°F | 4.0" |
| June | 68°F | 93°F | 80°F | 3.5" |
| July | 71°F | 96°F | 83°F | 18.6" |
| August | 71°F | 96°F | 82°F | 5.8" |
| September | 66°F | 91°F | 77°F | 7.3" |
| October | 56°F | 84°F | 68°F | 5.1" |
| November | 45°F | 69°F | 56°F | 7.2" |
| December | 37°F | 61°F | 47°F | 3.5" |
| Index | Lake Brownwood | Texas | National |
| Air quality index | 33 | 52 | 42 |
| Pollution index | 316,727 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 329 |
| Days with moderate air quality | 33 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Santa Anna, TX | 1,075 | 33 | 34.0% |
| Bangs, TX | 1,518 | 33 | 34.0% |
| Santa Anna CDP, TX | 39 | 33 | 34.0% |
| Brownwood, TX | 18,554 | 33 | 34.0% |
| Thunderbird Bay, TX | 613 | 33 | 34.0% |
| Lake Brownwood, TX | 1,461 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Nashville, MI | 1,461 | 36 | 28.0% |
| Millers Creek, NC | 1,461 | 26 | 48.0% |
| Avis, PA | 1,461 | 35 | 30.0% |
| Queen City, TX | 1,461 | 39 | 22.0% |
| Willacoochee, GA | 1,462 | 26 | 48.0% |
| Lake Brownwood, TX | 1,461 | 33 | 34.0% |
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