| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 59°F | 45°F | 5.7" |
| February | 38°F | 64°F | 49°F | 2.3" |
| March | 47°F | 74°F | 58°F | 3.4" |
| April | 54°F | 81°F | 66°F | 5.3" |
| May | 61°F | 86°F | 72°F | 7.2" |
| June | 70°F | 93°F | 81°F | 7.8" |
| July | 72°F | 95°F | 83°F | 8.5" |
| August | 72°F | 95°F | 82°F | 3.7" |
| September | 66°F | 87°F | 75°F | 7.1" |
| October | 56°F | 79°F | 66°F | 6.3" |
| November | 45°F | 69°F | 55°F | 8.4" |
| December | 37°F | 59°F | 46°F | 4.3" |
| Index | Hamlin | Texas | National |
| Air quality index | 25 | 52 | 42 |
| Pollution index | 122,809 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 330 |
| Days with good air quality | 316 |
| Days with moderate air quality | 13 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Roby, TX | 799 | 25 | 50.0% |
| Anson, TX | 1,884 | 26 | 48.0% |
| Hamlin, TX | 1,810 | 25 | 50.0% |
| City | Population | Air Quality Index | National Avg. |
| Tariffville, CT | 1,810 | 41 | 18.0% |
| Monroe, IA | 1,810 | 39 | 22.0% |
| Stockton, MO | 1,810 | 39 | 22.0% |
| Sharon, MS | 1,810 | 35 | 30.0% |
| Seabrook Island, SC | 1,810 | 38 | 24.0% |
| Hamlin, TX | 1,810 | 25 | 50.0% |
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