Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 13°F | 27°F | 19°F | 0.5" |
February | 14°F | 29°F | 21°F | 0.4" |
March | 29°F | 45°F | 36°F | 1.5" |
April | 40°F | 59°F | 48°F | 3.4" |
May | 50°F | 70°F | 60°F | 2.9" |
June | 61°F | 79°F | 69°F | 4.3" |
July | 65°F | 82°F | 73°F | 3.9" |
August | 62°F | 79°F | 70°F | 4.0" |
September | 54°F | 73°F | 63°F | 3.4" |
October | 43°F | 61°F | 51°F | 3.0" |
November | 31°F | 47°F | 38°F | 1.0" |
December | 18°F | 31°F | 24°F | 0.9" |
Index | Spillville | Iowa | National |
Air quality index | 39 | 39 | 42 |
Pollution index | 530,484 | 1,154,535 | 2,726,193 |
Measurement | Total |
Days measured | 363 |
Days with good air quality | 286 |
Days with moderate air quality | 77 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.000% |
Benzene | 0.010% |
Carbon Tetrachloride | 0.001% |
Lead | 0.002% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Ridgeway, IA | 258 | 35 | 30.0% |
Castalia, IA | 169 | 35 | 30.0% |
Decorah, IA | 7,615 | 35 | 30.0% |
Cresco, IA | 3,751 | 36 | 28.0% |
Ossian, IA | 798 | 39 | 22.0% |
Spillville, IA | 427 | 39 | 22.0% |
City | Population | Air Quality Index | National Avg. |
Hopewell, IL | 427 | 41 | 18.0% |
Oak Grove, IL | 427 | 46 | 8.0% |
Scotch Meadows, NC | 427 | 30 | 40.0% |
Turkey, NC | 427 | 40 | 20.0% |
Lockhart, SC | 427 | 36 | 28.0% |
Spillville, IA | 427 | 39 | 22.0% |