| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 27°F | 17°F | 0.3" |
| February | 10°F | 30°F | 19°F | 0.5" |
| March | 26°F | 46°F | 34°F | 1.2" |
| April | 36°F | 61°F | 47°F | 2.9" |
| May | 48°F | 73°F | 59°F | 4.0" |
| June | 58°F | 82°F | 70°F | 5.0" |
| July | 62°F | 86°F | 74°F | 3.2" |
| August | 59°F | 82°F | 70°F | 4.3" |
| September | 51°F | 77°F | 63°F | 2.9" |
| October | 39°F | 63°F | 49°F | 2.3" |
| November | 25°F | 48°F | 36°F | 0.9" |
| December | 12°F | 30°F | 21°F | 0.8" |
| Index | Melvin | Iowa | National |
| Air quality index | 36 | 39 | 42 |
| Pollution index | 627,200 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 321 |
| Days with moderate air quality | 43 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hartley, IA | 1,583 | 35 | 30.0% |
| Archer, IA | 116 | 35 | 30.0% |
| Hospers, IA | 812 | 35 | 30.0% |
| Primghar, IA | 1,030 | 35 | 30.0% |
| Everly, IA | 595 | 35 | 30.0% |
| Melvin, IA | 237 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Teller, AK | 237 | 38 | 24.0% |
| Ulm, AR | 237 | 45 | 10.0% |
| McNabb, IL | 237 | 0 | 100.0% |
| Menominee, IL | 237 | 29 | 42.0% |
| Omaha, IL | 237 | 45 | 10.0% |
| Melvin, IA | 237 | 36 | 28.0% |
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