| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 45°F | 35°F | 2.7" |
| February | 29°F | 49°F | 38°F | 2.5" |
| March | 38°F | 60°F | 48°F | 4.6" |
| April | 48°F | 72°F | 60°F | 7.3" |
| May | 57°F | 79°F | 68°F | 5.6" |
| June | 66°F | 88°F | 77°F | 4.4" |
| July | 69°F | 90°F | 79°F | 3.7" |
| August | 66°F | 88°F | 76°F | 3.0" |
| September | 58°F | 83°F | 70°F | 4.7" |
| October | 47°F | 73°F | 59°F | 2.2" |
| November | 37°F | 58°F | 47°F | 4.8" |
| December | 31°F | 48°F | 39°F | 3.6" |
| Index | Pocahontas | Missouri | National |
| Air quality index | 44 | 97 | 42 |
| Pollution index | 2,331,220 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 261 |
| Days with moderate air quality | 103 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.002% |
| Mercury | 0.260% |
| City | Population | Air Quality Index | National Avg. |
| Biehle, MO | 28 | 43 | 14.0% |
| Altenburg, MO | 345 | 43 | 14.0% |
| Longtown, MO | 127 | 43 | 14.0% |
| Frohna, MO | 319 | 43 | 14.0% |
| Gorham, IL | 263 | 43 | 14.0% |
| Pocahontas, MO | 29 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Larsen Bay, AK | 29 | 31 | 38.0% |
| Birdsong, AR | 29 | 45 | 10.0% |
| Norristown, GA | 29 | 47 | 6.0% |
| St. Anthony, IA | 29 | 37 | 26.0% |
| Kaskaskia, IL | 29 | 54 | 8.0% |
| Pocahontas, MO | 29 | 44 | 12.0% |
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