| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 56°F | 43°F | 3.9" |
| February | 37°F | 60°F | 47°F | 3.5" |
| March | 47°F | 69°F | 56°F | 7.8" |
| April | 54°F | 76°F | 64°F | 7.5" |
| May | 62°F | 82°F | 71°F | 8.3" |
| June | 71°F | 91°F | 80°F | 3.7" |
| July | 73°F | 94°F | 83°F | 4.9" |
| August | 73°F | 95°F | 83°F | 4.9" |
| September | 66°F | 88°F | 76°F | 4.8" |
| October | 54°F | 78°F | 65°F | 5.1" |
| November | 44°F | 67°F | 54°F | 4.6" |
| December | 37°F | 57°F | 46°F | 5.3" |
| Index | Windom | Texas | National |
| Air quality index | 325 | 52 | 42 |
| Pollution index | 723,856 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 138 |
| Days with good air quality | 120 |
| Days with moderate air quality | 17 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bonham, TX | 10,295 | 325 | 550.0% |
| Ladonia, TX | 752 | 325 | 550.0% |
| Ravenna, TX | 159 | 325 | 550.0% |
| Dodd City, TX | 486 | 325 | 550.0% |
| Leonard, TX | 2,554 | 325 | 550.0% |
| Windom, TX | 145 | 325 | 550.0% |
| City | Population | Air Quality Index | National Avg. |
| Port Lions, AK | 145 | 31 | 38.0% |
| Tanacross, AK | 145 | 38 | 24.0% |
| Orrville, AL | 145 | 52 | 4.0% |
| Bieber, CA | 145 | 42 | 16.0% |
| Daphnedale Park, CA | 145 | 29 | 42.0% |
| Windom, TX | 145 | 325 | 550.0% |
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