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 | 42 |
Pollution index | 975,807 | 1,154,535 | 2,726,193 |
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 | Population | Air Quality Index | National Avg. |
Columbus Junction, IA | 2,260 | 32 | 36.0% |
Wapello, IA | 1,898 | 32 | 36.0% |
Conesville, IA | 534 | 32 | 36.0% |
Cotter, IA | 21 | 32 | 36.0% |
Winfield, IA | 1,035 | 32 | 36.0% |
Letts, IA | 334 | 32 | 36.0% |
City | Population | Air Quality Index | National Avg. |
Eckley, CO | 334 | 45 | 10.0% |
Kapalua, HI | 334 | 15 | 70.0% |
Crawfordsville, IA | 334 | 32 | 36.0% |
Bazine, KS | 334 | 15 | 70.0% |
Clarks, NE | 334 | 19 | 62.0% |
Letts, IA | 334 | 32 | 36.0% |