Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 35°F | 47°F | 40°F | 8.3" |
February | 36°F | 52°F | 42°F | 5.4" |
March | 40°F | 56°F | 46°F | 6.0" |
April | 41°F | 62°F | 50°F | 4.8" |
May | 47°F | 69°F | 56°F | 5.7" |
June | 52°F | 73°F | 60°F | 3.6" |
July | 55°F | 80°F | 65°F | 2.1" |
August | 55°F | 81°F | 66°F | 2.8" |
September | 51°F | 75°F | 61°F | 5.1" |
October | 46°F | 63°F | 53°F | 6.4" |
November | 40°F | 52°F | 45°F | 8.2" |
December | 35°F | 45°F | 39°F | 8.9" |
Index | Castle Rock | Washington | National |
Air quality index | 18 | 36 | 42 |
Pollution index | 4,215,410 | 4,541,850 | 2,726,193 |
Measurement | Total |
Days measured | 360 |
Days with good air quality | 338 |
Days with moderate air quality | 22 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.005% |
Benzene | 0.050% |
Carbon Tetrachloride | 0.004% |
Lead | 0.030% |
Mercury | 0.250% |
City | Population | Air Quality Index | National Avg. |
Longview, WA | 37,914 | 18 | 64.0% |
Vader, WA | 696 | 18 | 64.0% |
Clatskanie, OR | 2,189 | 18 | 64.0% |
Longview Heights, WA | 4,388 | 18 | 64.0% |
West Side Highway, WA | 5,735 | 18 | 64.0% |
Castle Rock, WA | 2,917 | 18 | 64.0% |
City | Population | Air Quality Index | National Avg. |
Heritage Lake, IN | 2,917 | 54 | 8.0% |
Chaffee, MO | 2,917 | 44 | 12.0% |
Seaside Heights, NJ | 2,917 | 41 | 18.0% |
University Park, NM | 2,917 | 51 | 2.0% |
Peace River E, BC | 2,917 | n/a | |
Castle Rock, WA | 2,917 | 18 | 64.0% |