| 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 | Gilmer | 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. |
| Hawkins, TX | 1,641 | 36 | 28.0% |
| Holly Lake Ranch, TX | 2,507 | 36 | 28.0% |
| Longview, TX | 82,183 | 37 | 26.0% |
| Big Sandy, TX | 1,406 | 37 | 26.0% |
| East Mountain, TX | 1,197 | 37 | 26.0% |
| Gilmer, TX | 5,139 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Jackson, GA | 5,138 | 38 | 24.0% |
| Ayden, NC | 5,138 | 38 | 24.0% |
| Schuylkill Haven, PA | 5,137 | 42 | 16.0% |
| Wolfforth, TX | 5,137 | 25 | 50.0% |
| Birdsboro, PA | 5,141 | 42 | 16.0% |
| Gilmer, TX | 5,139 | 37 | 26.0% |
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