Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 34°F | 48°F | 40°F | 5.4" |
February | 36°F | 52°F | 43°F | 3.7" |
March | 39°F | 57°F | 47°F | 4.9" |
April | 42°F | 63°F | 52°F | 2.9" |
May | 48°F | 71°F | 58°F | 2.6" |
June | 53°F | 76°F | 63°F | 1.7" |
July | 57°F | 84°F | 69°F | 0.5" |
August | 57°F | 84°F | 69°F | 0.4" |
September | 52°F | 79°F | 64°F | 1.5" |
October | 46°F | 66°F | 55°F | 3.7" |
November | 40°F | 54°F | 47°F | 6.2" |
December | 34°F | 47°F | 40°F | 6.2" |
Index | Walnut Grove | Washington | National |
Air quality index | 38 | 36 | 42 |
Pollution index | 1,899,410 | 4,541,850 | 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 | 0.003% |
Benzene | 0.020% |
Carbon Tetrachloride | 0.010% |
Lead | 0.010% |
Mercury | 0.002% |
City | Population | Air Quality Index | National Avg. |
St. Helens, OR | 13,779 | 18 | 64.0% |
Troutdale, OR | 16,433 | 38 | 24.0% |
Camas, WA | 24,043 | 38 | 24.0% |
Meadow Glade, WA | 2,774 | 38 | 24.0% |
Yacolt, WA | 1,686 | 38 | 24.0% |
Walnut Grove, WA | 9,324 | 38 | 24.0% |
City | Population | Air Quality Index | National Avg. |
Northwest Harborcreek, PA | 9,321 | 36 | 28.0% |
Hondo, TX | 9,321 | 49 | 2.0% |
Sellersburg, IN | 9,320 | 49 | 2.0% |
Brentwood, PA | 9,319 | 56 | 12.0% |
Bohemia, NY | 9,329 | 43 | 14.0% |
Walnut Grove, WA | 9,324 | 38 | 24.0% |