| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 25°F | 15°F | 6.8" |
| February | 10°F | 31°F | 20°F | 2.6" |
| March | 22°F | 45°F | 33°F | 1.9" |
| April | 34°F | 59°F | 46°F | 2.3" |
| May | 45°F | 70°F | 57°F | 4.2" |
| June | 56°F | 80°F | 68°F | 5.5" |
| July | 60°F | 84°F | 72°F | 3.6" |
| August | 57°F | 81°F | 69°F | 3.9" |
| September | 49°F | 75°F | 61°F | 2.2" |
| October | 36°F | 61°F | 48°F | 2.5" |
| November | 24°F | 46°F | 34°F | 1.2" |
| December | 10°F | 28°F | 19°F | 3.4" |
| Index | Hills | Minnesota | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 2,464,570 | 1,854,519 | 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 | 0.000% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Lester, IA | 278 | 36 | 28.0% |
| Magnolia, MN | 193 | 36 | 28.0% |
| Garretson, SD | 1,493 | 36 | 28.0% |
| Alvord, IA | 213 | 36 | 28.0% |
| Rock Rapids, IA | 2,555 | 36 | 28.0% |
| Hills, MN | 819 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Rockport, AR | 819 | 38 | 24.0% |
| Milltown, IN | 819 | 49 | 2.0% |
| St. Mary of the Woods, IN | 819 | 45 | 10.0% |
| Spring Valley, KY | 819 | 49 | 2.0% |
| Aquasco, MD | 819 | 47 | 6.0% |
| Hills, MN | 819 | 36 | 28.0% |
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