| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 58°F | 42°F | 0.7" |
| February | 35°F | 63°F | 46°F | 0.7" |
| March | 44°F | 73°F | 56°F | 0.7" |
| April | 52°F | 80°F | 65°F | 1.6" |
| May | 60°F | 86°F | 71°F | 3.1" |
| June | 69°F | 93°F | 80°F | 1.9" |
| July | 71°F | 94°F | 82°F | 2.0" |
| August | 71°F | 94°F | 82°F | 1.0" |
| September | 64°F | 86°F | 74°F | 2.9" |
| October | 53°F | 78°F | 64°F | 1.1" |
| November | 42°F | 68°F | 53°F | 0.8" |
| December | 33°F | 58°F | 43°F | 0.8" |
| Index | Lake Colorado City | Texas | National |
| Air quality index | 28 | 52 | 42 |
| Pollution index | 498,875 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 354 |
| Days with good air quality | 319 |
| Days with moderate air quality | 35 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.150% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Loraine, TX | 503 | 28 | 44.0% |
| Westbrook, TX | 150 | 28 | 44.0% |
| Colorado City, TX | 4,038 | 28 | 44.0% |
| Lake Colorado City, TX | 620 | 28 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Thornton, AR | 620 | 35 | 30.0% |
| Allensworth, CA | 620 | 66 | 32.0% |
| Baker, CA | 620 | 15 | 70.0% |
| Collins, GA | 620 | 39 | 22.0% |
| Hoyt, KS | 620 | 41 | 18.0% |
| Lake Colorado City, TX | 620 | 28 | 44.0% |