| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 65°F | 46°F | 1.1" |
| February | 36°F | 70°F | 51°F | 1.2" |
| March | 44°F | 78°F | 60°F | 1.8" |
| April | 52°F | 85°F | 68°F | 1.8" |
| May | 60°F | 90°F | 74°F | 4.1" |
| June | 69°F | 97°F | 82°F | 2.4" |
| July | 71°F | 98°F | 84°F | 1.3" |
| August | 71°F | 98°F | 84°F | 2.9" |
| September | 64°F | 92°F | 77°F | 3.3" |
| October | 52°F | 84°F | 67°F | 2.1" |
| November | 42°F | 74°F | 57°F | 0.8" |
| December | 34°F | 66°F | 48°F | 1.0" |
| Index | Mertzon | Texas | National |
| Air quality index | 28 | 52 | 42 |
| Pollution index | 1,277,540 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 354 |
| Days with good air quality | 319 |
| Days with moderate air quality | 35 |
| 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 | 0.002% |
| Lead | 0.080% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Mertzon, TX | 996 | 28 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Central Lake, MI | 996 | 36 | 28.0% |
| Lenkerville, PA | 996 | 44 | 12.0% |
| Soudersburg, PA | 996 | 45 | 10.0% |
| Boonville, CA | 997 | 33 | 34.0% |
| Jeffersonville, GA | 997 | 38 | 24.0% |
| Mertzon, TX | 996 | 28 | 44.0% |
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