| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 61°F | 51°F | 5.6" |
| February | 46°F | 65°F | 54°F | 6.0" |
| March | 51°F | 74°F | 61°F | 5.4" |
| April | 54°F | 78°F | 65°F | 4.2" |
| May | 63°F | 85°F | 73°F | 5.1" |
| June | 70°F | 92°F | 80°F | 3.3" |
| July | 72°F | 91°F | 80°F | 9.6" |
| August | 72°F | 94°F | 82°F | 6.3" |
| September | 69°F | 92°F | 79°F | 3.3" |
| October | 56°F | 82°F | 68°F | 6.5" |
| November | 50°F | 74°F | 60°F | 9.6" |
| December | 41°F | 66°F | 52°F | 5.7" |
| Index | Splendora | 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. |
| Woodloch, TX | 116 | 52 | 4.0% |
| Plum Grove, TX | 1,074 | 52 | 4.0% |
| Cleveland, TX | 8,150 | 52 | 4.0% |
| Roman Forest, TX | 1,814 | 52 | 4.0% |
| Cut and Shoot, TX | 973 | 52 | 4.0% |
| Splendora, TX | 1,899 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Bellport, NY | 1,899 | 43 | 14.0% |
| Coal Grove, OH | 1,899 | 42 | 16.0% |
| Intercourse, PA | 1,899 | 45 | 10.0% |
| Kedgwick, NB | 1,899 | n/a | |
| Wapello, IA | 1,898 | 32 | 36.0% |
| Splendora, TX | 1,899 | 52 | 4.0% |
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