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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 58°F | 47°F | 12.7" |
| February | 41°F | 61°F | 50°F | 7.9" |
| March | 49°F | 71°F | 59°F | 9.1" |
| April | 56°F | 78°F | 66°F | 10.8" |
| May | 64°F | 83°F | 73°F | 13.1" |
| June | 72°F | 91°F | 81°F | 7.9" |
| July | 74°F | 93°F | 82°F | 8.1" |
| August | 74°F | 94°F | 83°F | 12.4" |
| September | 67°F | 88°F | 77°F | 3.0" |
| October | 56°F | 79°F | 66°F | 8.0" |
| November | 48°F | 68°F | 57°F | 13.1" |
| December | 40°F | 60°F | 49°F | 11.8" |
| Index | Clarksville City | 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. |
| Lakeport, TX | 1,247 | 37 | 26.0% |
| White Oak, TX | 6,301 | 37 | 26.0% |
| Gladewater, TX | 5,960 | 37 | 26.0% |
| Longview, TX | 82,183 | 37 | 26.0% |
| Big Sandy, TX | 1,406 | 37 | 26.0% |
| Clarksville City, TX | 878 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Penryn, CA | 878 | 52 | 4.0% |
| Edon, OH | 878 | 45 | 10.0% |
| Trezevant, TN | 878 | 27 | 46.0% |
| Levan, UT | 878 | 46 | 8.0% |
| Gallant, AL | 877 | 43 | 14.0% |
| Clarksville City, TX | 878 | 37 | 26.0% |