| 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 | Hermleigh | Texas | National |
| Air quality index | 25 | 52 | 42 |
| Pollution index | 498,875 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 330 |
| Days with good air quality | 316 |
| Days with moderate air quality | 13 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| 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. |
| Snyder, TX | 11,211 | 25 | 50.0% |
| Roscoe, TX | 1,538 | 25 | 50.0% |
| Hermleigh, TX | 448 | 25 | 50.0% |
| City | Population | Air Quality Index | National Avg. |
| Grubbs, AR | 448 | 45 | 10.0% |
| Prattsville, AR | 448 | 45 | 10.0% |
| Andrew, IA | 448 | 42 | 16.0% |
| Badger, IA | 448 | 37 | 26.0% |
| Marquette, IA | 448 | 29 | 42.0% |
| Hermleigh, TX | 448 | 25 | 50.0% |
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