| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 66°F | 54°F | 3.9" |
| February | 48°F | 69°F | 57°F | 2.0" |
| March | 55°F | 74°F | 64°F | 3.0" |
| April | 61°F | 80°F | 70°F | 3.3" |
| May | 67°F | 85°F | 76°F | 4.0" |
| June | 73°F | 91°F | 81°F | 3.2" |
| July | 75°F | 92°F | 82°F | 4.9" |
| August | 75°F | 93°F | 83°F | 5.2" |
| September | 71°F | 90°F | 79°F | 4.3" |
| October | 61°F | 84°F | 71°F | 4.4" |
| November | 53°F | 75°F | 63°F | 3.0" |
| December | 48°F | 68°F | 57°F | 3.2" |
| Index | Richwood | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 6,628,750 | 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 | 0.020% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.660% |
| Lead | 0.060% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Brazoria, TX | 3,077 | 52 | 4.0% |
| Holiday Lakes, TX | 986 | 52 | 4.0% |
| Quintana, TX | 15 | 52 | 4.0% |
| Clute, TX | 11,655 | 52 | 4.0% |
| Jones Creek, TX | 1,986 | 52 | 4.0% |
| Richwood, TX | 3,949 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Aurora, IN | 3,948 | 54 | 8.0% |
| Sykesville, MD | 3,948 | 46 | 8.0% |
| Bunker Hill Village, TX | 3,948 | 52 | 4.0% |
| Washington, GA | 3,946 | 44 | 12.0% |
| Lyncourt, NY | 3,952 | 37 | 26.0% |
| Richwood, TX | 3,949 | 52 | 4.0% |
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