| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 56°F | 44°F | 3.8" |
| February | 38°F | 59°F | 47°F | 2.7" |
| March | 46°F | 69°F | 56°F | 5.0" |
| April | 53°F | 76°F | 64°F | 6.1" |
| May | 62°F | 82°F | 71°F | 7.3" |
| June | 70°F | 91°F | 80°F | 3.5" |
| July | 72°F | 94°F | 82°F | 10.2" |
| August | 73°F | 96°F | 83°F | 5.3" |
| September | 65°F | 88°F | 75°F | 6.3" |
| October | 53°F | 77°F | 63°F | 3.7" |
| November | 45°F | 67°F | 55°F | 6.0" |
| December | 37°F | 57°F | 45°F | 8.5" |
| Index | Clarksville | Texas | National |
| Air quality index | 39 | 52 | 42 |
| Pollution index | 2,304,530 | 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 | 0.900% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.040% |
| Mercury | 1.100% |
| City | Population | Air Quality Index | National Avg. |
| Annona, TX | 372 | 39 | 22.0% |
| Bogata, TX | 1,175 | 39 | 22.0% |
| Deport, TX | 810 | 325 | 550.0% |
| Detroit, TX | 848 | 325 | 550.0% |
| Clarksville, TX | 3,115 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Kings Bay Base, GA | 3,115 | 36 | 28.0% |
| Beaver, UT | 3,115 | 44 | 12.0% |
| Clearbrook Park, NJ | 3,114 | 41 | 18.0% |
| Sloatsburg, NY | 3,114 | 51 | 2.0% |
| Harbor Bluffs, FL | 3,116 | 43 | 14.0% |
| Clarksville, TX | 3,115 | 39 | 22.0% |
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