| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 25°F | 16°F | 0.5" |
| February | 11°F | 28°F | 19°F | 0.8" |
| March | 26°F | 44°F | 34°F | 1.5" |
| April | 39°F | 59°F | 48°F | 4.1" |
| May | 50°F | 72°F | 60°F | 4.4" |
| June | 60°F | 81°F | 70°F | 5.8" |
| July | 65°F | 85°F | 75°F | 4.8" |
| August | 62°F | 82°F | 72°F | 6.0" |
| September | 55°F | 75°F | 64°F | 3.1" |
| October | 42°F | 60°F | 50°F | 3.1" |
| November | 29°F | 46°F | 36°F | 1.3" |
| December | 14°F | 28°F | 21°F | 1.3" |
| Index | Orono | Minnesota | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 1,774,860 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 214 |
| Days with moderate air quality | 148 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Watertown, MN | 4,473 | 46 | 8.0% |
| Richfield, MN | 36,253 | 46 | 8.0% |
| Greenfield, MN | 3,013 | 46 | 8.0% |
| Medina, MN | 6,549 | 46 | 8.0% |
| Rockford, MN | 4,481 | 46 | 8.0% |
| Orono, MN | 8,217 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Manhattan, IL | 8,218 | 55 | 10.0% |
| Geneseo, NY | 8,218 | 37 | 26.0% |
| Upper Saddle River, NJ | 8,214 | 51 | 2.0% |
| Jefferson City, TN | 8,220 | 44 | 12.0% |
| Breaux Bridge, LA | 8,213 | 41 | 18.0% |
| Orono, MN | 8,217 | 46 | 8.0% |
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