| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 63°F | 47°F | 2.9" |
| February | 39°F | 67°F | 52°F | 2.1" |
| March | 47°F | 74°F | 60°F | 4.2" |
| April | 54°F | 81°F | 67°F | 3.7" |
| May | 62°F | 87°F | 74°F | 5.5" |
| June | 71°F | 95°F | 83°F | 3.7" |
| July | 74°F | 98°F | 85°F | 2.2" |
| August | 74°F | 99°F | 86°F | 2.3" |
| September | 67°F | 93°F | 79°F | 3.5" |
| October | 55°F | 84°F | 69°F | 4.5" |
| November | 46°F | 73°F | 59°F | 2.3" |
| December | 37°F | 63°F | 49°F | 1.9" |
| Index | Clifton | Texas | National |
| Air quality index | 38 | 52 | 42 |
| Pollution index | 4,190,870 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 329 |
| Days with moderate air quality | 36 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.060% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Meridian, TX | 1,720 | 33 | 34.0% |
| Laguna Park, TX | 1,650 | 38 | 24.0% |
| Valley Mills, TX | 1,393 | 38 | 24.0% |
| Cranfills Gap, TX | 289 | 38 | 24.0% |
| Clifton, TX | 3,427 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Carrollton, MO | 3,427 | 47 | 6.0% |
| Freeland, PA | 3,427 | 38 | 24.0% |
| Houston, MS | 3,426 | 39 | 22.0% |
| Montrose, NY | 3,428 | 36 | 28.0% |
| Hominy, OK | 3,428 | 45 | 10.0% |
| Clifton, TX | 3,427 | 38 | 24.0% |
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