| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 57°F | 41°F | 0.4" |
| February | 33°F | 60°F | 44°F | 0.7" |
| March | 42°F | 71°F | 54°F | 1.9" |
| April | 49°F | 79°F | 62°F | 2.9" |
| May | 59°F | 84°F | 70°F | 2.4" |
| June | 68°F | 94°F | 80°F | 3.1" |
| July | 70°F | 95°F | 82°F | 2.6" |
| August | 70°F | 94°F | 81°F | 3.8" |
| September | 61°F | 86°F | 72°F | 4.2" |
| October | 50°F | 77°F | 62°F | 2.9" |
| November | 40°F | 69°F | 53°F | 0.1" |
| December | 29°F | 55°F | 40°F | 1.2" |
| Index | Clarendon | Texas | National |
| Air quality index | 44 | 52 | 42 |
| Pollution index | 243,843 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 259 |
| Days with moderate air quality | 96 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Howardwick, TX | 417 | 44 | 12.0% |
| Hedley, TX | 245 | 44 | 12.0% |
| Clarendon, TX | 1,810 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Tariffville, CT | 1,810 | 41 | 18.0% |
| Monroe, IA | 1,810 | 39 | 22.0% |
| Stockton, MO | 1,810 | 39 | 22.0% |
| Sharon, MS | 1,810 | 35 | 30.0% |
| Seabrook Island, SC | 1,810 | 38 | 24.0% |
| Clarendon, TX | 1,810 | 44 | 12.0% |
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