| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 64°F | 50°F | 8.7" |
| February | 44°F | 69°F | 55°F | 2.4" |
| March | 52°F | 76°F | 62°F | 12.6" |
| April | 59°F | 82°F | 69°F | 18.2" |
| May | 65°F | 87°F | 75°F | 7.9" |
| June | 72°F | 94°F | 82°F | 6.3" |
| July | 74°F | 96°F | 84°F | 9.3" |
| August | 74°F | 98°F | 85°F | 13.2" |
| September | 69°F | 92°F | 79°F | 7.0" |
| October | 59°F | 84°F | 70°F | 6.2" |
| November | 50°F | 74°F | 61°F | 5.4" |
| December | 43°F | 65°F | 52°F | 3.5" |
| Index | Lockhart | Texas | National |
| Air quality index | 44 | 52 | 42 |
| Pollution index | 680,332 | 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 | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Luling, TX | 5,850 | 44 | 12.0% |
| Kyle, TX | 45,828 | 44 | 12.0% |
| San Marcos, TX | 64,053 | 44 | 12.0% |
| Martindale, TX | 1,059 | 44 | 12.0% |
| Mountain City, TX | 536 | 44 | 12.0% |
| Lockhart, TX | 13,782 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Wood Dale, IL | 13,783 | 55 | 10.0% |
| St. Helens, OR | 13,779 | 18 | 64.0% |
| Jefferson Valley-Yorktown, NY | 13,786 | 36 | 28.0% |
| Bridgetown, OH | 13,786 | 54 | 8.0% |
| Royse City, TX | 13,773 | 51 | 2.0% |
| Lockhart, TX | 13,782 | 44 | 12.0% |
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