| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 59°F | 46°F | 2.9" |
| February | 40°F | 63°F | 50°F | 2.1" |
| March | 49°F | 71°F | 59°F | 4.7" |
| April | 56°F | 78°F | 66°F | 3.6" |
| May | 64°F | 85°F | 73°F | 4.4" |
| June | 72°F | 93°F | 82°F | 4.2" |
| July | 74°F | 96°F | 84°F | 2.1" |
| August | 75°F | 97°F | 85°F | 2.3" |
| September | 68°F | 90°F | 78°F | 2.6" |
| October | 56°F | 81°F | 67°F | 4.1" |
| November | 47°F | 69°F | 57°F | 2.8" |
| December | 39°F | 60°F | 48°F | 3.2" |
| Index | Oak Grove | Texas | National |
| Air quality index | 51 | 52 | 42 |
| Pollution index | 3,706,540 | 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 | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Kemp, TX | 1,149 | 41 | 18.0% |
| Rosser, TX | 521 | 41 | 18.0% |
| Gun Barrel City, TX | 6,401 | 41 | 18.0% |
| Cottonwood, TX | 327 | 41 | 18.0% |
| Mabank, TX | 3,821 | 41 | 18.0% |
| Oak Grove, TX | 671 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Bradford, AR | 671 | 45 | 10.0% |
| Lytle Creek, CA | 671 | 89 | 78.0% |
| Brownsboro Farm, KY | 671 | 49 | 2.0% |
| Salem, KY | 671 | 44 | 12.0% |
| Lattimore, NC | 671 | 36 | 28.0% |
| Oak Grove, TX | 671 | 51 | 2.0% |