| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 57°F | 45°F | 3.6" |
| February | 39°F | 60°F | 48°F | 3.5" |
| March | 47°F | 69°F | 57°F | 4.7" |
| April | 54°F | 77°F | 65°F | 5.1" |
| May | 62°F | 83°F | 72°F | 5.0" |
| June | 70°F | 91°F | 80°F | 3.0" |
| July | 73°F | 94°F | 82°F | 4.1" |
| August | 73°F | 94°F | 82°F | 3.1" |
| September | 65°F | 88°F | 76°F | 4.3" |
| October | 54°F | 78°F | 65°F | 4.2" |
| November | 46°F | 67°F | 55°F | 3.7" |
| December | 38°F | 58°F | 47°F | 4.8" |
| Index | Texarkana | Texas | National |
| Air quality index | 39 | 52 | 42 |
| Pollution index | 537,821 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 349 |
| Days with good air quality | 254 |
| Days with moderate air quality | 94 |
| 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 | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Texarkana, AR | 29,864 | 39 | 22.0% |
| Leary, TX | 616 | 39 | 22.0% |
| Redwater, TX | 1,177 | 39 | 22.0% |
| Fouke, AR | 796 | 39 | 22.0% |
| Wake Village, TX | 5,611 | 39 | 22.0% |
| Texarkana, TX | 36,733 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Waxahachie, TX | 36,735 | 51 | 2.0% |
| New Albany, IN | 36,730 | 49 | 2.0% |
| Campbell River, BC | 36,740 | n/a | |
| Addison, IL | 36,714 | 55 | 10.0% |
| University, FL | 36,709 | 43 | 14.0% |
| Texarkana, TX | 36,733 | 39 | 22.0% |
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