| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 40°F | 27°F | 0.6" |
| February | 20°F | 43°F | 31°F | 1.1" |
| March | 34°F | 58°F | 44°F | 2.3" |
| April | 44°F | 68°F | 55°F | 4.1" |
| May | 54°F | 77°F | 65°F | 5.1" |
| June | 65°F | 87°F | 75°F | 5.2" |
| July | 68°F | 89°F | 78°F | 3.6" |
| August | 65°F | 87°F | 75°F | 4.1" |
| September | 56°F | 81°F | 68°F | 3.7" |
| October | 44°F | 69°F | 55°F | 3.6" |
| November | 32°F | 56°F | 43°F | 1.7" |
| December | 21°F | 41°F | 30°F | 1.6" |
| Index | Oregon | Missouri | National |
| Air quality index | 43 | 97 | 42 |
| Pollution index | 2,582,160 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 283 |
| Days with moderate air quality | 82 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Bigelow, MO | 3 | 43 | 14.0% |
| Forest City, MO | 266 | 43 | 14.0% |
| Mound City, MO | 1,150 | 43 | 14.0% |
| Amazonia, MO | 310 | 43 | 14.0% |
| Big Lake, MO | 75 | 43 | 14.0% |
| Oregon, MO | 963 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Union Bridge, MD | 963 | 42 | 16.0% |
| Kingston, NJ | 963 | 41 | 18.0% |
| North Hornell, NY | 963 | 35 | 30.0% |
| Blue Mounds, WI | 963 | 39 | 22.0% |
| Sanikiluaq, NU | 963 | n/a | |
| Oregon, MO | 963 | 43 | 14.0% |
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