| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 59°F | 40°F | 0.6" |
| February | 28°F | 65°F | 45°F | 0.3" |
| March | 34°F | 73°F | 52°F | 0.3" |
| April | 40°F | 79°F | 60°F | 0.7" |
| May | 48°F | 85°F | 67°F | 1.5" |
| June | 58°F | 91°F | 75°F | 2.4" |
| July | 61°F | 88°F | 74°F | 4.0" |
| August | 60°F | 87°F | 73°F | 4.6" |
| September | 55°F | 82°F | 68°F | 3.3" |
| October | 45°F | 78°F | 60°F | 1.6" |
| November | 33°F | 68°F | 49°F | 0.8" |
| December | 26°F | 61°F | 41°F | 0.5" |
| Index | Marfa | Texas | National |
| Air quality index | 47 | 52 | 42 |
| Pollution index | 212,433 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 212 |
| Days with moderate air quality | 134 |
| Days w/ poor A.Q. for sensitive groups | 17 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Marfa, TX | 1,974 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Burns Flat, OK | 1,974 | 43 | 14.0% |
| Jerome, IL | 1,973 | 40 | 20.0% |
| Merrionette Park, IL | 1,973 | 55 | 10.0% |
| Mountain Lake Park, MD | 1,975 | 36 | 28.0% |
| Steele, MO | 1,975 | 26 | 48.0% |
| Marfa, TX | 1,974 | 47 | 6.0% |
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