| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 61°F | 49°F | 6.8" |
| February | 46°F | 69°F | 56°F | 5.8" |
| March | 52°F | 74°F | 62°F | 14.0" |
| April | 57°F | 79°F | 67°F | 5.5" |
| May | 61°F | 81°F | 70°F | 10.8" |
| June | 70°F | 89°F | 79°F | 9.6" |
| July | 73°F | 94°F | 83°F | 2.4" |
| August | 71°F | 93°F | 81°F | 12.6" |
| September | 66°F | 91°F | 77°F | 8.6" |
| October | 58°F | 84°F | 69°F | 12.1" |
| November | 49°F | 72°F | 59°F | 9.5" |
| December | 43°F | 63°F | 51°F | 8.5" |
| Index | Henderson | Texas | National |
| Air quality index | 37 | 52 | 42 |
| Pollution index | 3,084,680 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 289 |
| Days with moderate air quality | 67 |
| Days w/ poor A.Q. for sensitive groups | 9 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Arp, TX | 1,402 | 36 | 28.0% |
| Overton, TX | 3,051 | 36 | 28.0% |
| New London, TX | 1,260 | 37 | 26.0% |
| Lake Cherokee, TX | 3,283 | 37 | 26.0% |
| Henderson, TX | 13,145 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Stoughton, WI | 13,146 | 39 | 22.0% |
| Rocky Point, NY | 13,138 | 43 | 14.0% |
| Warrenville, IL | 13,137 | 55 | 10.0% |
| Timberlake, VA | 13,130 | 26 | 48.0% |
| La Grange Park, IL | 13,129 | 55 | 10.0% |
| Henderson, TX | 13,145 | 37 | 26.0% |
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