| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 57°F | 45°F | 2.3" |
| February | 39°F | 61°F | 48°F | 1.6" |
| March | 47°F | 69°F | 57°F | 1.7" |
| April | 55°F | 77°F | 65°F | 3.7" |
| May | 62°F | 83°F | 72°F | 3.2" |
| June | 71°F | 91°F | 80°F | 2.8" |
| July | 74°F | 95°F | 83°F | 1.2" |
| August | 74°F | 96°F | 84°F | 2.0" |
| September | 66°F | 89°F | 76°F | 1.0" |
| October | 55°F | 79°F | 65°F | 2.9" |
| November | 46°F | 68°F | 56°F | 2.1" |
| December | 38°F | 58°F | 47°F | 2.4" |
| Index | Quinlan | Texas | National |
| Air quality index | 51 | 52 | 42 |
| Pollution index | 37,723,200 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 181 |
| Days with moderate air quality | 155 |
| Days w/ poor A.Q. for sensitive groups | 28 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.290% |
| Carbon Tetrachloride | 0.220% |
| Lead | 0.230% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Hawk Cove, TX | 427 | 51 | 2.0% |
| Royse City, TX | 13,773 | 51 | 2.0% |
| Terrell, TX | 18,513 | 51 | 2.0% |
| Caddo Mills, TX | 1,666 | 51 | 2.0% |
| Josephine, TX | 1,488 | 51 | 2.0% |
| Quinlan, TX | 1,758 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Smackover, AR | 1,758 | 35 | 30.0% |
| Scenic, AZ | 1,758 | 44 | 12.0% |
| Church Hill, PA | 1,758 | 44 | 12.0% |
| Bradley, WV | 1,758 | 295 | 490.0% |
| Denver, IA | 1,759 | 39 | 22.0% |
| Quinlan, TX | 1,758 | 51 | 2.0% |
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