Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 34°F | 48°F | 40°F | 4.1" |
February | 35°F | 53°F | 43°F | 3.9" |
March | 40°F | 61°F | 49°F | 4.7" |
April | 42°F | 62°F | 51°F | 3.1" |
May | 48°F | 70°F | 58°F | 4.2" |
June | 51°F | 73°F | 60°F | 2.3" |
July | 56°F | 84°F | 69°F | 2.0" |
August | 55°F | 85°F | 68°F | 4.3" |
September | 49°F | 76°F | 61°F | 4.5" |
October | 46°F | 62°F | 53°F | 5.6" |
November | 36°F | 53°F | 43°F | 5.8" |
December | 35°F | 47°F | 40°F | 10.1" |
Index | Lake Oswego | Oregon | National |
Air quality index | 38 | 32 | 42 |
Pollution index | 11,541,100 | 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 | 0.140% |
Carbon Tetrachloride | 0.020% |
Lead | 0.020% |
Mercury | 0.010% |
City | Population | Air Quality Index | National Avg. |
Donald, OR | 1,465 | 32 | 36.0% |
Dundee, OR | 3,296 | 32 | 36.0% |
St. Paul, OR | 396 | 32 | 36.0% |
Fairview, OR | 9,382 | 38 | 24.0% |
Wood Village, OR | 4,069 | 38 | 24.0% |
Lake Oswego, OR | 39,476 | 38 | 24.0% |
City | Population | Air Quality Index | National Avg. |
Carol Stream, IL | 39,447 | 55 | 10.0% |
Los Banos, CA | 39,443 | 48 | 4.0% |
Plant City, FL | 39,437 | 36 | 28.0% |
Columbia, TN | 39,515 | 31 | 38.0% |
Meadow Woods, FL | 39,424 | 39 | 22.0% |
Lake Oswego, OR | 39,476 | 38 | 24.0% |