| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 63°F | 52°F | 2.4" |
| February | 46°F | 67°F | 55°F | 2.9" |
| March | 53°F | 74°F | 62°F | 3.6" |
| April | 60°F | 80°F | 69°F | 2.5" |
| May | 67°F | 86°F | 75°F | 5.1" |
| June | 73°F | 93°F | 82°F | 2.7" |
| July | 75°F | 94°F | 83°F | 1.7" |
| August | 75°F | 96°F | 84°F | 4.8" |
| September | 70°F | 90°F | 79°F | 2.9" |
| October | 60°F | 83°F | 70°F | 2.7" |
| November | 52°F | 73°F | 61°F | 3.1" |
| December | 46°F | 65°F | 54°F | 3.1" |
| Index | Somerville | Texas | National |
| Air quality index | 44 | 52 | 42 |
| Pollution index | 402,930 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 249 |
| Days with moderate air quality | 114 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Burton, TX | 310 | 44 | 12.0% |
| Caldwell, TX | 4,354 | 44 | 12.0% |
| Carmine, TX | 204 | 44 | 12.0% |
| Snook, TX | 554 | 44 | 12.0% |
| Brenham, TX | 17,297 | 52 | 4.0% |
| Somerville, TX | 1,226 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Pasatiempo, CA | 1,226 | 35 | 30.0% |
| Elwood, NJ | 1,226 | 40 | 20.0% |
| Muscoda, WI | 1,226 | 29 | 42.0% |
| Wyanet, IL | 1,227 | 0 | 100.0% |
| Geneva, IN | 1,227 | 31 | 38.0% |
| Somerville, TX | 1,226 | 44 | 12.0% |
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