| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 57°F | 42°F | 2.8" |
| February | 34°F | 62°F | 46°F | 3.7" |
| March | 44°F | 72°F | 56°F | 3.5" |
| April | 52°F | 80°F | 64°F | 4.7" |
| May | 61°F | 87°F | 73°F | 4.2" |
| June | 72°F | 96°F | 83°F | 4.1" |
| July | 74°F | 99°F | 86°F | 9.8" |
| August | 73°F | 99°F | 85°F | 4.3" |
| September | 65°F | 91°F | 77°F | 8.3" |
| October | 54°F | 80°F | 65°F | 3.0" |
| November | 42°F | 68°F | 54°F | 3.7" |
| December | 33°F | 56°F | 42°F | 2.8" |
| Index | Chillicothe | Texas | National |
| Air quality index | 26 | 52 | 42 |
| Pollution index | 578,842 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 345 |
| Days with good air quality | 308 |
| Days with moderate air quality | 37 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.150% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.040% |
| Mercury | 0.080% |
| City | Population | Air Quality Index | National Avg. |
| Quanah, TX | 2,377 | 26 | 48.0% |
| Vernon, TX | 10,078 | 26 | 48.0% |
| Eldorado, OK | 474 | 43 | 14.0% |
| Chillicothe, TX | 771 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Mignon, AL | 771 | 38 | 24.0% |
| Millry, AL | 771 | 36 | 28.0% |
| McNary, AZ | 771 | 44 | 12.0% |
| Stratford, CA | 771 | 56 | 12.0% |
| Hubbard, IA | 771 | 37 | 26.0% |
| Chillicothe, TX | 771 | 26 | 48.0% |
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