| 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 | Mullin | Texas | National |
| Air quality index | 42 | 52 | 42 |
| Pollution index | 389,634 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 284 |
| Days with moderate air quality | 79 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Goldthwaite, TX | 1,906 | 42 | 16.0% |
| Mullin, TX | 162 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Beatrice, AL | 162 | 52 | 4.0% |
| Chapin, IA | 162 | 15 | 70.0% |
| Colburn, IN | 162 | 42 | 16.0% |
| Tampa, KS | 162 | 22 | 56.0% |
| Nebo, KY | 162 | 43 | 14.0% |
| Mullin, TX | 162 | 42 | 16.0% |
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