| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 60°F | 47°F | 1.9" |
| February | 40°F | 66°F | 51°F | 1.1" |
| March | 48°F | 73°F | 59°F | 1.4" |
| April | 55°F | 80°F | 66°F | 1.7" |
| May | 62°F | 84°F | 72°F | 3.9" |
| June | 70°F | 92°F | 81°F | 2.5" |
| July | 73°F | 95°F | 83°F | 1.8" |
| August | 73°F | 97°F | 84°F | 0.9" |
| September | 66°F | 89°F | 77°F | 1.9" |
| October | 57°F | 81°F | 67°F | 2.4" |
| November | 47°F | 70°F | 57°F | 1.6" |
| December | 39°F | 61°F | 48°F | 1.4" |
| Index | 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. |
| Early, TX | 3,113 | 33 | 34.0% |
| Lake Brownwood, TX | 1,461 | 33 | 34.0% |
| Bangs, TX | 1,518 | 33 | 34.0% |
| Thunderbird Bay, TX | 613 | 33 | 34.0% |
| Blanket, TX | 353 | 33 | 34.0% |
| Brownwood, TX | 18,554 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Lake Ronkonkoma, NY | 18,555 | 43 | 14.0% |
| Winthrop Town, MA | 18,558 | 43 | 14.0% |
| East Massapequa, NY | 18,564 | 51 | 2.0% |
| Rancho Mirage, CA | 18,537 | 89 | 78.0% |
| Central Saanich, BC | 18,572 | n/a | |
| Brownwood, TX | 18,554 | 33 | 34.0% |
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