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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 29°F | 20°F | 0.8" |
| February | 14°F | 32°F | 23°F | 1.0" |
| March | 28°F | 48°F | 37°F | 2.1" |
| April | 39°F | 63°F | 50°F | 4.6" |
| May | 50°F | 73°F | 61°F | 3.9" |
| June | 60°F | 81°F | 70°F | 7.0" |
| July | 63°F | 84°F | 73°F | 4.8" |
| August | 61°F | 82°F | 71°F | 4.7" |
| September | 53°F | 76°F | 64°F | 4.0" |
| October | 42°F | 63°F | 52°F | 3.1" |
| November | 29°F | 49°F | 38°F | 2.1" |
| December | 17°F | 33°F | 25°F | 1.9" |
| Index | Anamosa | Iowa | National |
| Air quality index | 39 | 39 | 42 |
| Pollution index | 551,554 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 287 |
| Days with moderate air quality | 78 |
| 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. |
| Cascade, IA | 2,104 | 29 | 42.0% |
| Stanwood, IA | 673 | 35 | 30.0% |
| Lisbon, IA | 2,138 | 39 | 22.0% |
| Mechanicsville, IA | 983 | 39 | 22.0% |
| Olin, IA | 966 | 39 | 22.0% |
| Anamosa, IA | 5,484 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Eureka, IL | 5,485 | 41 | 18.0% |
| Chadron, NE | 5,482 | 19 | 62.0% |
| Saint-Roch-de-l'Achigan, QC | 5,486 | n/a | |
| Orchard Homes, MT | 5,480 | 40 | 20.0% |
| Glencoe, MN | 5,488 | 46 | 8.0% |
| Anamosa, IA | 5,484 | 39 | 22.0% |
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