Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 36°F | 46°F | 41°F | 6.0" |
February | 38°F | 49°F | 43°F | 4.2" |
March | 39°F | 53°F | 45°F | 5.8" |
April | 42°F | 58°F | 49°F | 3.1" |
May | 47°F | 66°F | 55°F | 2.4" |
June | 51°F | 71°F | 59°F | 1.3" |
July | 55°F | 77°F | 64°F | 0.6" |
August | 55°F | 77°F | 65°F | 0.8" |
September | 52°F | 71°F | 60°F | 1.5" |
October | 47°F | 60°F | 52°F | 4.5" |
November | 41°F | 51°F | 46°F | 6.8" |
December | 36°F | 45°F | 40°F | 5.8" |
Index | Herron Island | Washington | National |
Air quality index | 21 | 36 | 42 |
Pollution index | 6,704,330 | 4,541,850 | 2,726,193 |
Measurement | Total |
Days measured | 361 |
Days with good air quality | 339 |
Days with moderate air quality | 22 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.003% |
Benzene | 0.100% |
Carbon Tetrachloride | 0.004% |
Lead | 0.030% |
Mercury | 0.003% |
City | Population | Air Quality Index | National Avg. |
Belfair, WA | 4,557 | 18 | 64.0% |
Wauna, WA | 4,509 | 18 | 64.0% |
Raft Island, WA | 416 | 18 | 64.0% |
Wollochet, WA | 7,193 | 18 | 64.0% |
Canterwood, WA | 3,070 | 18 | 64.0% |
Herron Island, WA | 50 | 21 | 58.0% |
City | Population | Air Quality Index | National Avg. |
Tonopah, AZ | 50 | 74 | 48.0% |
Fish Camp, CA | 50 | 50 | = 100 |
Lookout, CA | 50 | 29 | 42.0% |
Idalia, CO | 50 | 58 | 16.0% |
Pine Island, FL | 50 | 30 | 40.0% |
Herron Island, WA | 50 | 21 | 58.0% |