| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 60°F | 48°F | 3.8" |
| February | 41°F | 63°F | 51°F | 3.1" |
| March | 48°F | 72°F | 59°F | 5.3" |
| April | 55°F | 79°F | 66°F | 4.1" |
| May | 63°F | 85°F | 73°F | 5.3" |
| June | 71°F | 92°F | 81°F | 3.8" |
| July | 74°F | 95°F | 83°F | 3.1" |
| August | 74°F | 96°F | 83°F | 3.2" |
| September | 67°F | 90°F | 78°F | 2.8" |
| October | 55°F | 81°F | 67°F | 3.8" |
| November | 47°F | 70°F | 57°F | 3.8" |
| December | 40°F | 61°F | 49°F | 4.2" |
| Index | Tatum | Texas | National |
| Air quality index | 38 | 52 | 42 |
| Pollution index | 402,347 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 296 |
| Days with moderate air quality | 67 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Easton, TX | 424 | 37 | 26.0% |
| Lake Cherokee, TX | 3,283 | 37 | 26.0% |
| Lakeport, TX | 1,247 | 37 | 26.0% |
| Hallsville, TX | 4,297 | 37 | 26.0% |
| Longview, TX | 82,183 | 37 | 26.0% |
| Tatum, TX | 1,306 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Shell Knob, MO | 1,306 | 18 | 64.0% |
| Glasgow, VA | 1,306 | 26 | 48.0% |
| Charlo, NB | 1,306 | n/a | |
| Pointe-aux-Outardes, QC | 1,306 | n/a | |
| Minneota, MN | 1,307 | 32 | 36.0% |
| Tatum, TX | 1,306 | 38 | 24.0% |
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