| 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 | Post Oak Bend City | 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. |
| Grays Prairie, TX | 281 | 41 | 18.0% |
| Kemp, TX | 1,117 | 41 | 18.0% |
| Rosser, TX | 505 | 41 | 18.0% |
| Cottonwood, TX | 318 | 41 | 18.0% |
| Combine, TX | 2,535 | 51 | 2.0% |
| Post Oak Bend City, TX | 515 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| La Paz Valley, AZ | 515 | 13 | 74.0% |
| Craigmont, ID | 515 | 29 | 42.0% |
| New Boston, IL | 515 | 32 | 36.0% |
| Fancy Farm, KY | 515 | 44 | 12.0% |
| McCoole, MD | 515 | 36 | 28.0% |
| Post Oak Bend City, TX | 515 | 51 | 2.0% |
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