| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 58°F | 45°F | 7.1" |
| February | 39°F | 62°F | 49°F | 4.4" |
| March | 47°F | 70°F | 58°F | 5.0" |
| April | 55°F | 77°F | 65°F | 6.6" |
| May | 62°F | 84°F | 72°F | 6.7" |
| June | 71°F | 92°F | 81°F | 7.1" |
| July | 73°F | 96°F | 84°F | 5.0" |
| August | 73°F | 97°F | 84°F | 7.7" |
| September | 67°F | 90°F | 77°F | 5.4" |
| October | 55°F | 80°F | 67°F | 13.4" |
| November | 47°F | 69°F | 56°F | 6.3" |
| December | 38°F | 59°F | 47°F | 6.4" |
| Index | Garrett | Texas | National |
| Air quality index | 41 | 52 | 42 |
| Pollution index | 3,706,540 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 275 |
| Days with moderate air quality | 80 |
| Days w/ poor A.Q. for sensitive groups | 7 |
| Days with unhealthy air quality | 3 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ennis, TX | 19,917 | 41 | 18.0% |
| Emhouse, TX | 333 | 41 | 18.0% |
| Italy, TX | 2,264 | 41 | 18.0% |
| Alma, TX | 433 | 41 | 18.0% |
| Rice, TX | 1,008 | 41 | 18.0% |
| Garrett, TX | 924 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Santa Susana, CA | 924 | 72 | 44.0% |
| Lewisburg, KY | 924 | 43 | 14.0% |
| Metolius, OR | 924 | 23 | 54.0% |
| Triton, NL | 924 | n/a | |
| White, GA | 923 | 44 | 12.0% |
| Garrett, TX | 924 | 41 | 18.0% |
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