Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 10°F | 27°F | 18°F | 2.1" |
February | 14°F | 32°F | 22°F | 3.7" |
March | 28°F | 46°F | 35°F | 3.9" |
April | 38°F | 61°F | 48°F | 4.8" |
May | 49°F | 72°F | 60°F | 6.4" |
June | 60°F | 81°F | 70°F | 7.8" |
July | 63°F | 84°F | 73°F | 7.3" |
August | 60°F | 81°F | 70°F | 6.7" |
September | 52°F | 77°F | 63°F | 4.7" |
October | 40°F | 63°F | 50°F | 7.2" |
November | 28°F | 48°F | 37°F | 4.5" |
December | 16°F | 31°F | 23°F | 2.5" |
Index | Williams | Iowa | National |
Air quality index | 37 | 39 | 42 |
Pollution index | 1,013,960 | 1,154,535 | 2,726,193 |
Measurement | Total |
Days measured | 214 |
Days with good air quality | 210 |
Days with moderate air quality | 4 |
Days w/ poor A.Q. for sensitive groups | |
Days with unhealthy air quality |
Pollutant | Total |
Arsenic | 0.000% |
Benzene | 0.010% |
Carbon Tetrachloride | 0.001% |
Lead | 0.001% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Galt, IA | 35 | 15 | 70.0% |
Bradford, IA | 61 | 15 | 70.0% |
Popejoy, IA | 106 | 15 | 70.0% |
Dows, IA | 529 | 15 | 70.0% |
Webster City, IA | 7,699 | 37 | 26.0% |
Williams, IA | 327 | 37 | 26.0% |
City | Population | Air Quality Index | National Avg. |
King Salmon, AK | 327 | 31 | 38.0% |
Fulton, AL | 327 | 36 | 28.0% |
Mentone, AL | 327 | 39 | 22.0% |
Chauncey, GA | 327 | 26 | 48.0% |
Irwin, IA | 327 | 40 | 20.0% |
Williams, IA | 327 | 37 | 26.0% |