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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 37°F | 24°F | 0.6" |
| February | 16°F | 41°F | 27°F | 0.9" |
| March | 29°F | 56°F | 41°F | 1.5" |
| April | 40°F | 67°F | 53°F | 3.8" |
| May | 50°F | 77°F | 63°F | 5.2" |
| June | 62°F | 87°F | 74°F | 4.9" |
| July | 66°F | 91°F | 78°F | 3.1" |
| August | 64°F | 88°F | 75°F | 6.1" |
| September | 55°F | 82°F | 67°F | 3.7" |
| October | 42°F | 69°F | 54°F | 3.0" |
| November | 29°F | 55°F | 41°F | 1.0" |
| December | 17°F | 39°F | 27°F | 1.7" |
| Index | Atlantic | Iowa | National |
| Air quality index | 40 | 39 | 42 |
| Pollution index | 338,773 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 283 |
| Days with moderate air quality | 82 |
| 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 | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Massena, IA | 387 | 39 | 22.0% |
| Anita, IA | 938 | 39 | 22.0% |
| Brayton, IA | 111 | 40 | 20.0% |
| Lewis, IA | 513 | 40 | 20.0% |
| Walnut, IA | 746 | 40 | 20.0% |
| Atlantic, IA | 6,600 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Anadarko, OK | 6,600 | 43 | 14.0% |
| Desert Palms, CA | 6,599 | 89 | 78.0% |
| Bedford, VA | 6,599 | 26 | 48.0% |
| Marion, SC | 6,598 | 40 | 20.0% |
| Torrington, WY | 6,597 | 19 | 62.0% |
| Atlantic, IA | 6,600 | 40 | 20.0% |
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