| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 64°F | 52°F | 6.8" |
| February | 48°F | 68°F | 56°F | 4.7" |
| March | 54°F | 75°F | 63°F | 8.5" |
| April | 60°F | 80°F | 70°F | 5.1" |
| May | 66°F | 86°F | 75°F | 13.3" |
| June | 71°F | 92°F | 80°F | 6.1" |
| July | 72°F | 92°F | 81°F | 7.3" |
| August | 73°F | 94°F | 82°F | 5.9" |
| September | 70°F | 89°F | 78°F | 6.8" |
| October | 59°F | 83°F | 70°F | 12.5" |
| November | 52°F | 74°F | 61°F | 6.4" |
| December | 46°F | 65°F | 55°F | 6.3" |
| Index | Sienna Plantation | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 701,652 | 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 | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Arcola, TX | 2,541 | 52 | 4.0% |
| Fifth Street, TX | 2,179 | 52 | 4.0% |
| Manvel, TX | 11,432 | 52 | 4.0% |
| Sandy Point, TX | 209 | 52 | 4.0% |
| Meadows Place, TX | 4,899 | 52 | 4.0% |
| Sienna Plantation, TX | 15,649 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Canyon, TX | 15,648 | 44 | 12.0% |
| Parlier, CA | 15,645 | 60 | 20.0% |
| Elkton, MD | 15,653 | 42 | 16.0% |
| Overland, MO | 15,644 | 54 | 8.0% |
| White Oak, MD | 15,655 | 47 | 6.0% |
| Sienna Plantation, TX | 15,649 | 52 | 4.0% |
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