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				| 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 | Sherwood | 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. | 
| Lafayette, OR | 4,222 | 32 | 36.0% | 
| Woodburn, OR | 26,008 | 32 | 36.0% | 
| Dayton, OR | 2,726 | 32 | 36.0% | 
| Molalla, OR | 9,224 | 32 | 36.0% | 
| Donald, OR | 1,465 | 32 | 36.0% | 
| Sherwood, OR | 19,745 | 38 | 24.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Mont-Saint-Hilaire, QC | 19,745 | n/a | |
| Shafter, CA | 19,743 | 67 | 34.0% | 
| Blythe, CA | 19,747 | 13 | 74.0% | 
| West Mifflin, PA | 19,742 | 56 | 12.0% | 
| Niskayuna, NY | 19,741 | 37 | 26.0% | 
| Sherwood, OR | 19,745 | 38 | 24.0% |