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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 32°F | 23°F | 1.0" |
| February | 17°F | 35°F | 25°F | 1.1" |
| March | 30°F | 51°F | 39°F | 2.4" |
| April | 41°F | 64°F | 52°F | 4.8" |
| May | 51°F | 74°F | 62°F | 4.6" |
| June | 62°F | 84°F | 73°F | 6.1" |
| July | 66°F | 86°F | 75°F | 4.7" |
| August | 64°F | 84°F | 73°F | 4.5" |
| September | 55°F | 78°F | 66°F | 3.3" |
| October | 43°F | 65°F | 53°F | 3.3" |
| November | 31°F | 51°F | 40°F | 1.9" |
| December | 19°F | 35°F | 27°F | 1.9" |
| Index | Hills | Iowa | National |
| Air quality index | 35 | 39 | 42 |
| Pollution index | 3,671,140 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 278 |
| Days with moderate air quality | 86 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| West Liberty, IA | 3,750 | 32 | 36.0% |
| Nichols, IA | 376 | 32 | 36.0% |
| Conesville, IA | 534 | 32 | 36.0% |
| Iowa City, IA | 75,849 | 35 | 30.0% |
| University Heights, IA | 1,332 | 35 | 30.0% |
| Hills, IA | 870 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Downey, ID | 870 | 27 | 46.0% |
| Dugger, IN | 870 | 45 | 10.0% |
| Au Gres, MI | 870 | 26 | 48.0% |
| Brookside, OH | 870 | 39 | 22.0% |
| Killbuck, OH | 870 | 41 | 18.0% |
| Hills, IA | 870 | 35 | 30.0% |
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