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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 45°F | 34°F | 4.7" |
| February | 27°F | 48°F | 36°F | 5.1" |
| March | 39°F | 61°F | 49°F | 7.5" |
| April | 47°F | 71°F | 58°F | 9.4" |
| May | 55°F | 77°F | 66°F | 9.1" |
| June | 65°F | 85°F | 75°F | 8.0" |
| July | 68°F | 89°F | 78°F | 10.2" |
| August | 66°F | 87°F | 77°F | 14.5" |
| September | 58°F | 80°F | 68°F | 9.4" |
| October | 47°F | 70°F | 58°F | 8.9" |
| November | 37°F | 59°F | 47°F | 7.7" |
| December | 29°F | 47°F | 37°F | 7.4" |
| Index | St. Robert | Missouri | National |
| Air quality index | 39 | 97 | 42 |
| Pollution index | 1,558,740 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 238 |
| Days with moderate air quality | 7 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Richland, MO | 2,388 | 39 | 22.0% |
| Newburg, MO | 290 | 39 | 22.0% |
| Waynesville, MO | 5,260 | 39 | 22.0% |
| Dixon, MO | 991 | 39 | 22.0% |
| Crocker, MO | 899 | 39 | 22.0% |
| St. Robert, MO | 6,193 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Salem, IN | 6,193 | 35 | 30.0% |
| Rushville, IN | 6,194 | 28 | 44.0% |
| South Monroe, MI | 6,194 | 1 | 98.0% |
| Jan Phyl Village, FL | 6,195 | 36 | 28.0% |
| Port Clinton, OH | 6,190 | 40 | 20.0% |
| St. Robert, MO | 6,193 | 39 | 22.0% |
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