| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 66°F | 54°F | 3.6" |
| February | 46°F | 70°F | 57°F | 2.9" |
| March | 52°F | 76°F | 64°F | 3.6" |
| April | 59°F | 82°F | 70°F | 4.3" |
| May | 66°F | 88°F | 76°F | 5.5" |
| June | 73°F | 94°F | 83°F | 4.6" |
| July | 75°F | 95°F | 84°F | 5.1" |
| August | 75°F | 96°F | 84°F | 7.0" |
| September | 70°F | 92°F | 80°F | 4.2" |
| October | 59°F | 85°F | 71°F | 6.1" |
| November | 51°F | 76°F | 62°F | 3.4" |
| December | 45°F | 67°F | 55°F | 4.1" |
| Index | Roman Forest | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 99,643 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 171 |
| Days with moderate air quality | 163 |
| Days w/ poor A.Q. for sensitive groups | 26 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.001% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Atascocita, TX | 81,860 | 52 | 4.0% |
| Plum Grove, TX | 1,074 | 52 | 4.0% |
| Cleveland, TX | 8,150 | 52 | 4.0% |
| Splendora, TX | 1,899 | 52 | 4.0% |
| Cut and Shoot, TX | 973 | 52 | 4.0% |
| Roman Forest, TX | 1,814 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Calhoun Falls, SC | 1,814 | 31 | 38.0% |
| Idalou, TX | 1,814 | 25 | 50.0% |
| Jenkins, KY | 1,815 | 45 | 10.0% |
| Pierre Part, LA | 1,815 | 45 | 10.0% |
| Victory Lakes, NJ | 1,813 | 40 | 20.0% |
| Roman Forest, TX | 1,814 | 52 | 4.0% |
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