| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 61°F | 46°F | 4.7" |
| February | 38°F | 68°F | 51°F | 4.9" |
| March | 44°F | 75°F | 58°F | 2.7" |
| April | 53°F | 81°F | 65°F | 4.3" |
| May | 60°F | 86°F | 72°F | 4.0" |
| June | 68°F | 93°F | 80°F | 3.5" |
| July | 71°F | 96°F | 83°F | 18.6" |
| August | 71°F | 96°F | 82°F | 5.8" |
| September | 66°F | 91°F | 77°F | 7.3" |
| October | 56°F | 84°F | 68°F | 5.1" |
| November | 45°F | 69°F | 56°F | 7.2" |
| December | 37°F | 61°F | 47°F | 3.5" |
| Index | Melvin | Texas | National |
| Air quality index | 42 | 52 | 42 |
| Pollution index | 316,727 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 284 |
| Days with moderate air quality | 79 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Brady, TX | 5,282 | 42 | 16.0% |
| Melvin, TX | 247 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Moose Pass, AK | 247 | 31 | 38.0% |
| Sunizona, AZ | 247 | 45 | 10.0% |
| Norwood, GA | 247 | 47 | 6.0% |
| Dundee, IA | 247 | 39 | 22.0% |
| Easton, KS | 247 | 43 | 14.0% |
| Melvin, TX | 247 | 42 | 16.0% |
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