| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 56°F | 44°F | 2.5" |
| February | 38°F | 60°F | 47°F | 2.1" |
| March | 47°F | 69°F | 56°F | 2.9" |
| April | 54°F | 76°F | 64°F | 4.7" |
| May | 61°F | 82°F | 71°F | 5.6" |
| June | 71°F | 91°F | 81°F | 4.5" |
| July | 74°F | 95°F | 84°F | 3.1" |
| August | 74°F | 96°F | 84°F | 3.1" |
| September | 67°F | 89°F | 77°F | 2.9" |
| October | 56°F | 79°F | 66°F | 3.1" |
| November | 46°F | 67°F | 56°F | 2.9" |
| December | 37°F | 56°F | 45°F | 2.6" |
| Index | Bonham | 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. |
| Ector, TX | 954 | 325 | 550.0% |
| Ladonia, TX | 752 | 325 | 550.0% |
| Ravenna, TX | 159 | 325 | 550.0% |
| Hendrix, OK | 81 | 325 | 550.0% |
| Whitewright, TX | 1,594 | 325 | 550.0% |
| Bonham, TX | 10,295 | 325 | 550.0% |
| City | Population | Air Quality Index | National Avg. |
| Nanticoke, PA | 10,296 | 38 | 24.0% |
| Bluffton, IN | 10,298 | 31 | 38.0% |
| Melvindale, MI | 10,300 | 56 | 12.0% |
| Forest Acres, SC | 10,300 | 43 | 14.0% |
| Cottage Grove, OR | 10,302 | 38 | 24.0% |
| Bonham, TX | 10,295 | 325 | 550.0% |
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