| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 27°F | 19°F | 0.7" |
| February | 13°F | 29°F | 21°F | 0.7" |
| March | 29°F | 45°F | 36°F | 1.7" |
| April | 39°F | 60°F | 48°F | 2.8" |
| May | 50°F | 71°F | 60°F | 2.4" |
| June | 60°F | 80°F | 70°F | 5.1" |
| July | 62°F | 82°F | 72°F | 2.5" |
| August | 60°F | 79°F | 69°F | 2.3" |
| September | 53°F | 75°F | 63°F | 3.0" |
| October | 42°F | 61°F | 50°F | 2.8" |
| November | 29°F | 47°F | 37°F | 1.1" |
| December | 17°F | 31°F | 24°F | 1.8" |
| Index | Hawkeye | Iowa | National |
| Air quality index | 39 | 39 | 42 |
| Pollution index | 530,484 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 286 |
| Days with moderate air quality | 77 |
| 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 | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Castalia, IA | 169 | 35 | 30.0% |
| Maynard, IA | 506 | 39 | 22.0% |
| Jackson Junction, IA | 89 | 39 | 22.0% |
| Wadena, IA | 220 | 39 | 22.0% |
| Ossian, IA | 798 | 39 | 22.0% |
| Hawkeye, IA | 488 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Subiaco, AR | 488 | 36 | 28.0% |
| Rudd, IA | 488 | 15 | 70.0% |
| Burnettsville, IN | 488 | 42 | 16.0% |
| Beaver City, NE | 488 | 19 | 62.0% |
| Lipan, TX | 488 | 33 | 34.0% |
| Hawkeye, IA | 488 | 39 | 22.0% |
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