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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 26°F | 2.0" |
| February | 28°F | 48°F | 37°F | 1.2" |
| March | 36°F | 58°F | 45°F | 7.3" |
| April | 45°F | 66°F | 54°F | 7.1" |
| May | 53°F | 75°F | 63°F | 8.1" |
| June | 65°F | 87°F | 76°F | 8.2" |
| July | 67°F | 87°F | 76°F | 6.8" |
| August | 63°F | 83°F | 72°F | 7.2" |
| September | 60°F | 82°F | 70°F | 7.1" |
| October | 46°F | 69°F | 57°F | 6.0" |
| November | 35°F | 56°F | 45°F | 2.4" |
| December | 23°F | 40°F | 30°F | 6.3" |
| Index | Essex | 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. |
| Riverton, IA | 257 | 40 | 20.0% |
| Coburg, IA | 36 | 40 | 20.0% |
| Emerson, IA | 462 | 40 | 20.0% |
| Stanton, IA | 627 | 40 | 20.0% |
| Clarinda, IA | 5,371 | 40 | 20.0% |
| Essex, IA | 772 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Altheimer, AR | 772 | 45 | 10.0% |
| Deer Park, CA | 772 | 34 | 32.0% |
| Hatfield, IN | 772 | 43 | 14.0% |
| Greensburg, KS | 772 | 15 | 70.0% |
| Tribune, KS | 772 | 15 | 70.0% |
| Essex, IA | 772 | 40 | 20.0% |
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