Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 15°F | 32°F | 23°F | 1.0" |
February | 17°F | 35°F | 25°F | 1.1" |
March | 30°F | 51°F | 39°F | 2.4" |
April | 41°F | 64°F | 52°F | 4.8" |
May | 51°F | 74°F | 62°F | 4.6" |
June | 62°F | 84°F | 73°F | 6.1" |
July | 66°F | 86°F | 75°F | 4.7" |
August | 64°F | 84°F | 73°F | 4.5" |
September | 55°F | 78°F | 66°F | 3.3" |
October | 43°F | 65°F | 53°F | 3.3" |
November | 31°F | 51°F | 40°F | 1.9" |
December | 19°F | 35°F | 27°F | 1.9" |
Index | Letts | Iowa | National |
Air quality index | 32 | 39 | 50 |
Pollution index | 975,807 | 1,643,836 | 5,066,862 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 300 |
Days with moderate air quality | 65 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.150% |
Benzene | 0.010% |
Carbon Tetrachloride | 0.001% |
Lead | 0.040% |
Mercury | 0.150% |
City, State | Population | Air Quality Index | National Avg. |
Cotter, IA | 38 | 32 | 36% |
Winfield, IA | 1,068 | 32 | 36% |
Fruitland, IA | 1,196 | 32 | 36% |
Nichols, IA | 360 | 32 | 36% |
Fredonia, IA | 313 | 32 | 36% |
Letts, IA | 410 | 32 | 36% |
City, State | Population | Air Quality Index | National Avg. |
Shelter Cove, CA | 410 | 27 | 46% |
Mount Charleston, NV | 410 | 54 | 8% |
Churdan, IA | 410 | 37 | 26% |
Rockland, ID | 410 | 27 | 46% |
Miles, IA | 410 | 42 | 16% |
Letts, IA | 410 | 32 | 36% |