| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 65°F | 52°F | 2.5" |
| February | 45°F | 70°F | 56°F | 1.3" |
| March | 51°F | 77°F | 63°F | 2.8" |
| April | 58°F | 83°F | 70°F | 2.4" |
| May | 65°F | 88°F | 76°F | 4.2" |
| June | 72°F | 95°F | 82°F | 2.2" |
| July | 73°F | 96°F | 83°F | 3.3" |
| August | 73°F | 98°F | 85°F | 2.2" |
| September | 69°F | 93°F | 79°F | 4.1" |
| October | 59°F | 85°F | 71°F | 2.5" |
| November | 51°F | 75°F | 62°F | 1.7" |
| December | 43°F | 66°F | 53°F | 2.1" |
| Index | Smiley | Texas | National |
| Air quality index | 31 | 52 | 42 |
| Pollution index | 636,223 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 341 |
| Days with good air quality | 319 |
| Days with moderate air quality | 22 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Nixon, TX | 2,487 | 49 | 2.0% |
| Smiley, TX | 621 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Brevig Mission, AK | 621 | 38 | 24.0% |
| Lockesburg, AR | 621 | 39 | 22.0% |
| Page Park, FL | 621 | 36 | 28.0% |
| Waikane, HI | 621 | 30 | 40.0% |
| Fallon Station, NV | 621 | 41 | 18.0% |
| Smiley, TX | 621 | 31 | 38.0% |
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