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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 47°F | 38°F | 4.1" |
| February | 33°F | 53°F | 42°F | 3.0" |
| March | 38°F | 60°F | 48°F | 4.8" |
| April | 39°F | 61°F | 50°F | 2.9" |
| May | 45°F | 70°F | 57°F | 4.8" |
| June | 48°F | 72°F | 59°F | 2.1" |
| July | 53°F | 83°F | 68°F | 1.3" |
| August | 51°F | 84°F | 67°F | 1.2" |
| September | 44°F | 75°F | 59°F | 2.8" |
| October | 42°F | 61°F | 50°F | 3.8" |
| November | 33°F | 52°F | 42°F | 7.5" |
| December | 33°F | 45°F | 39°F | 11.3" |
| Index | Cornelius | Oregon | National |
| Air quality index | 38 | 32 | 42 |
| Pollution index | 15,149,900 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 77 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.160% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.080% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Sherwood, OR | 19,745 | 38 | 24.0% |
| Aloha, OR | 53,724 | 38 | 24.0% |
| Oak Hills, OR | 11,682 | 38 | 24.0% |
| Banks, OR | 1,897 | 38 | 24.0% |
| Durham, OR | 1,764 | 38 | 24.0% |
| Cornelius, OR | 12,767 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Cypress Lake, FL | 12,766 | 36 | 28.0% |
| Manorville, NY | 12,764 | 43 | 14.0% |
| Amos, QC | 12,770 | n/a | |
| Harrison, OH | 12,763 | 54 | 8.0% |
| Trinity, FL | 12,761 | 43 | 14.0% |
| Cornelius, OR | 12,767 | 38 | 24.0% |
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