| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 24°F | 16°F | 1.7" |
| February | 10°F | 28°F | 18°F | 2.5" |
| March | 25°F | 42°F | 32°F | 2.7" |
| April | 35°F | 57°F | 45°F | 2.9" |
| May | 46°F | 70°F | 57°F | 6.8" |
| June | 57°F | 79°F | 68°F | 6.4" |
| July | 61°F | 83°F | 72°F | 6.0" |
| August | 59°F | 80°F | 68°F | 5.7" |
| September | 51°F | 74°F | 61°F | 7.5" |
| October | 38°F | 60°F | 48°F | 4.9" |
| November | 26°F | 45°F | 34°F | 2.6" |
| December | 12°F | 27°F | 19°F | 0.9" |
| Index | Hatfield | Minnesota | National |
| Air quality index | 42 | 35 | 42 |
| Pollution index | 1,069,770 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 284 |
| Days with moderate air quality | 76 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Chandler, MN | 312 | 32 | 36.0% |
| Lake Wilson, MN | 220 | 32 | 36.0% |
| Woodstock, MN | 113 | 32 | 36.0% |
| Holland, MN | 180 | 32 | 36.0% |
| Kenneth, MN | 59 | 36 | 28.0% |
| Hatfield, MN | 27 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Slana, AK | 27 | 38 | 24.0% |
| Belgreen, AL | 27 | 37 | 26.0% |
| Flowing Springs, AZ | 27 | 60 | 20.0% |
| Prattville, CA | 27 | 46 | 8.0% |
| Bevington, IA | 27 | 39 | 22.0% |
| Hatfield, MN | 27 | 42 | 16.0% |
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