| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 40°F | 28°F | 1.2" |
| February | 21°F | 42°F | 30°F | 2.0" |
| March | 35°F | 58°F | 45°F | 3.4" |
| April | 44°F | 68°F | 55°F | 4.2" |
| May | 54°F | 76°F | 65°F | 5.0" |
| June | 65°F | 86°F | 75°F | 6.2" |
| July | 68°F | 89°F | 78°F | 4.6" |
| August | 66°F | 87°F | 76°F | 5.3" |
| September | 57°F | 80°F | 67°F | 4.1" |
| October | 46°F | 69°F | 56°F | 3.5" |
| November | 34°F | 56°F | 44°F | 2.4" |
| December | 23°F | 42°F | 32°F | 2.2" |
| Index | McFall | Missouri | National |
| Air quality index | 43 | 97 | 42 |
| Pollution index | 1,056,450 | 1,630,255 | 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 | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Jameson, MO | 110 | 43 | 14.0% |
| Coffey, MO | 163 | 43 | 14.0% |
| Gallatin, MO | 1,674 | 43 | 14.0% |
| Lake Viking, MO | 355 | 43 | 14.0% |
| Darlington, MO | 62 | 43 | 14.0% |
| McFall, MO | 153 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Powhatan, AR | 153 | 45 | 10.0% |
| Hard Rock, AZ | 153 | 45 | 10.0% |
| Amador City, CA | 153 | 52 | 4.0% |
| Pine Flat, CA | 153 | 67 | 34.0% |
| Morriston, FL | 153 | 38 | 24.0% |
| McFall, MO | 153 | 43 | 14.0% |
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