| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 42°F | 31°F | 0.7" |
| February | 24°F | 45°F | 33°F | 1.3" |
| March | 38°F | 59°F | 47°F | 2.5" |
| April | 47°F | 68°F | 56°F | 4.5" |
| May | 56°F | 76°F | 65°F | 5.7" |
| June | 66°F | 86°F | 76°F | 5.1" |
| July | 70°F | 89°F | 79°F | 4.6" |
| August | 68°F | 88°F | 77°F | 4.7" |
| September | 60°F | 80°F | 69°F | 3.4" |
| October | 48°F | 69°F | 58°F | 3.5" |
| November | 38°F | 57°F | 46°F | 2.0" |
| December | 26°F | 44°F | 34°F | 1.5" |
| Index | Rayville | Missouri | National |
| Air quality index | 47 | 97 | 42 |
| Pollution index | 609,001 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 210 |
| Days with moderate air quality | 154 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Lathrop, MO | 2,277 | 43 | 14.0% |
| Crystal Lakes, MO | 464 | 47 | 6.0% |
| Mosby, MO | 112 | 47 | 6.0% |
| Elmira, MO | 24 | 47 | 6.0% |
| Missouri City, MO | 525 | 47 | 6.0% |
| Rayville, MO | 238 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Tonto Village, AZ | 238 | 60 | 20.0% |
| Dent, MN | 238 | 33 | 34.0% |
| Murdock, MN | 238 | 32 | 36.0% |
| Ivanhoe, NC | 238 | 34 | 32.0% |
| Dunbar, NE | 238 | 31 | 38.0% |
| Rayville, MO | 238 | 47 | 6.0% |