| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 26°F | 17°F | 0.1" |
| February | 11°F | 29°F | 20°F | 3.2" |
| March | 26°F | 44°F | 34°F | 2.7" |
| April | 38°F | 59°F | 48°F | 2.7" |
| May | 49°F | 71°F | 59°F | 3.9" |
| June | 59°F | 80°F | 69°F | 4.8" |
| July | 63°F | 85°F | 74°F | 3.7" |
| August | 61°F | 82°F | 71°F | 4.6" |
| September | 54°F | 75°F | 63°F | 2.9" |
| October | 41°F | 61°F | 50°F | 1.6" |
| November | 30°F | 46°F | 37°F | 1.0" |
| December | 15°F | 29°F | 22°F | 0.0" |
| Index | Goodhue | Minnesota | National |
| Air quality index | 37 | 35 | 42 |
| Pollution index | 2,142,550 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 216 |
| Days with good air quality | 203 |
| Days with moderate air quality | 13 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.510% |
| City | Population | Air Quality Index | National Avg. |
| Hammond, MN | 109 | 36 | 28.0% |
| Mazeppa, MN | 935 | 36 | 28.0% |
| Zumbro Falls, MN | 223 | 36 | 28.0% |
| Pine Island, MN | 3,629 | 36 | 28.0% |
| Bay City, WI | 444 | 37 | 26.0% |
| Goodhue, MN | 1,191 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Skagway, AK | 1,191 | 20 | 60.0% |
| Felton, DE | 1,191 | 42 | 16.0% |
| Haven, KS | 1,191 | 40 | 20.0% |
| Geronimo, OK | 1,191 | 43 | 14.0% |
| L'Anse-Saint-Jean, QC | 1,191 | n/a | |
| Goodhue, MN | 1,191 | 37 | 26.0% |
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