| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 45°F | 33°F | 2.4" |
| February | 25°F | 48°F | 35°F | 2.2" |
| March | 37°F | 61°F | 48°F | 3.6" |
| April | 47°F | 72°F | 59°F | 5.4" |
| May | 57°F | 80°F | 68°F | 4.6" |
| June | 67°F | 89°F | 78°F | 5.2" |
| July | 70°F | 92°F | 81°F | 4.2" |
| August | 69°F | 91°F | 79°F | 3.6" |
| September | 61°F | 84°F | 72°F | 4.3" |
| October | 48°F | 72°F | 60°F | 3.4" |
| November | 37°F | 60°F | 48°F | 3.4" |
| December | 27°F | 47°F | 37°F | 3.5" |
| Index | Cool Valley | Missouri | National |
| Air quality index | 54 | 97 | 42 |
| Pollution index | 8,473,050 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 134 |
| Days with moderate air quality | 221 |
| Days w/ poor A.Q. for sensitive groups | 8 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Oakland, MO | 1,538 | 54 | 8.0% |
| Sunset Hills, MO | 8,466 | 54 | 8.0% |
| East Carondelet, IL | 317 | 54 | 8.0% |
| Grantwood Village, MO | 947 | 54 | 8.0% |
| Wilbur Park, MO | 406 | 54 | 8.0% |
| Cool Valley, MO | 1,116 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Wagon Wheel, AZ | 1,116 | 44 | 12.0% |
| Livermore, KY | 1,116 | 43 | 14.0% |
| Tom Bean, TX | 1,116 | 325 | 550.0% |
| Division No. 4, Subd. B, NL | 1,116 | n/a | |
| New Market, AL | 1,115 | 44 | 12.0% |
| Cool Valley, MO | 1,116 | 54 | 8.0% |
Here are the best places to live in Missouri
See the best places to live in Cool Valley
Check out the 10 safest cities in Missouri
Most Dangerous Cities In The US