| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 27°F | 19°F | 1.4" |
| February | 13°F | 30°F | 21°F | 2.9" |
| March | 27°F | 44°F | 34°F | 3.1" |
| April | 38°F | 57°F | 46°F | 4.5" |
| May | 49°F | 70°F | 59°F | 8.1" |
| June | 60°F | 80°F | 69°F | 7.4" |
| July | 63°F | 82°F | 72°F | 6.6" |
| August | 61°F | 80°F | 70°F | 6.2" |
| September | 55°F | 75°F | 64°F | 5.2" |
| October | 42°F | 60°F | 50°F | 5.3" |
| November | 28°F | 45°F | 36°F | 2.3" |
| December | 18°F | 31°F | 24°F | 2.2" |
| Index | Oronoco | Minnesota | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 2,142,550 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 313 |
| Days with moderate air quality | 51 |
| 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% |
| Zumbro Falls, MN | 223 | 36 | 28.0% |
| Mantorville, MN | 950 | 36 | 28.0% |
| Elgin, MN | 1,189 | 36 | 28.0% |
| Millville, MN | 267 | 36 | 28.0% |
| Oronoco, MN | 1,517 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Cypress Quarters, FL | 1,517 | 36 | 28.0% |
| Eureka, MT | 1,517 | 37 | 26.0% |
| Hayden, AL | 1,516 | 53 | 6.0% |
| Del Rey Oaks, CA | 1,518 | 37 | 26.0% |
| Osborne, KS | 1,518 | 19 | 62.0% |
| Oronoco, MN | 1,517 | 36 | 28.0% |
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