Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 24°F | 37°F | 30°F | 2.8" |
February | 28°F | 46°F | 35°F | 2.1" |
March | 34°F | 54°F | 43°F | 2.0" |
April | 36°F | 59°F | 47°F | 1.8" |
May | 43°F | 69°F | 55°F | 2.0" |
June | 46°F | 73°F | 59°F | 2.0" |
July | 51°F | 88°F | 70°F | 0.9" |
August | 48°F | 86°F | 67°F | 1.2" |
September | 41°F | 73°F | 56°F | 1.4" |
October | 39°F | 61°F | 49°F | 2.4" |
November | 31°F | 45°F | 37°F | 2.7" |
December | 24°F | 35°F | 30°F | 2.9" |
Index | St. John | Washington | National |
Air quality index | 18 | 36 | 42 |
Pollution index | 1,232,200 | 4,541,850 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 354 |
Days with moderate air quality | 11 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.000% |
Benzene | 0.020% |
Carbon Tetrachloride | 0.002% |
Lead | 0.020% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Colfax, WA | 2,879 | 18 | 64.0% |
Endicott, WA | 337 | 18 | 64.0% |
Steptoe, WA | 135 | 18 | 64.0% |
Malden, WA | 219 | 43 | 14.0% |
Rosalia, WA | 648 | 43 | 14.0% |
St. John, WA | 612 | 18 | 64.0% |
City | Population | Air Quality Index | National Avg. |
Silverton, CO | 612 | 44 | 12.0% |
Wilsonville, IL | 612 | 54 | 8.0% |
Glen Elder, KS | 612 | 32 | 36.0% |
Leeton, MO | 612 | 47 | 6.0% |
Carlton, MT | 612 | 40 | 20.0% |
St. John, WA | 612 | 18 | 64.0% |