| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 47°F | 36°F | 3.2" |
| February | 30°F | 49°F | 39°F | 3.4" |
| March | 40°F | 62°F | 50°F | 5.9" |
| April | 49°F | 72°F | 60°F | 7.0" |
| May | 58°F | 79°F | 68°F | 5.6" |
| June | 68°F | 89°F | 78°F | 3.1" |
| July | 70°F | 90°F | 79°F | 4.3" |
| August | 68°F | 89°F | 77°F | 3.5" |
| September | 60°F | 83°F | 70°F | 4.2" |
| October | 48°F | 73°F | 59°F | 4.1" |
| November | 38°F | 60°F | 48°F | 4.7" |
| December | 32°F | 49°F | 39°F | 5.2" |
| Index | Essex | Missouri | National |
| Air quality index | 26 | 97 | 42 |
| Pollution index | 2,322,230 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 341 |
| Days with moderate air quality | 19 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.230% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.120% |
| City | Population | Air Quality Index | National Avg. |
| Catron, MO | 36 | 26 | 48.0% |
| Parma, MO | 616 | 26 | 48.0% |
| Canalou, MO | 186 | 26 | 48.0% |
| Penermon, MO | 122 | 26 | 48.0% |
| Dexter, MO | 7,867 | 26 | 48.0% |
| Essex, MO | 453 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Boulevard, CA | 453 | 58 | 16.0% |
| Argyle, GA | 453 | 26 | 48.0% |
| Martin, GA | 453 | 41 | 18.0% |
| Allerton, IA | 453 | 39 | 22.0% |
| Riley, IN | 453 | 45 | 10.0% |
| Essex, MO | 453 | 26 | 48.0% |
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