| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 24°F | 16°F | 0.3" |
| February | 11°F | 27°F | 18°F | 0.3" |
| March | 26°F | 42°F | 33°F | 1.2" |
| April | 38°F | 58°F | 46°F | 2.8" |
| May | 49°F | 70°F | 59°F | 2.7" |
| June | 59°F | 79°F | 68°F | 5.8" |
| July | 63°F | 83°F | 72°F | 4.9" |
| August | 60°F | 80°F | 69°F | 3.2" |
| September | 52°F | 74°F | 62°F | 3.4" |
| October | 41°F | 59°F | 49°F | 2.0" |
| November | 28°F | 45°F | 36°F | 0.6" |
| December | 15°F | 28°F | 21°F | 0.6" |
| Index | Hartland | Minnesota | National |
| Air quality index | 15 | 35 | 42 |
| Pollution index | 804,204 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 118 |
| Days with good air quality | 118 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Clarks Grove, MN | 640 | 15 | 70.0% |
| Freeborn, MN | 319 | 15 | 70.0% |
| Walters, MN | 65 | 15 | 70.0% |
| Manchester, MN | 56 | 15 | 70.0% |
| Wells, MN | 2,367 | 15 | 70.0% |
| Hartland, MN | 416 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Jerome, AZ | 416 | 43 | 14.0% |
| St. Mary's, CO | 416 | 47 | 6.0% |
| Between, GA | 416 | 44 | 12.0% |
| Earling, IA | 416 | 40 | 20.0% |
| Hartsville, IN | 416 | 41 | 18.0% |
| Hartland, MN | 416 | 15 | 70.0% |
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