| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 43°F | 33°F | 9.7" |
| February | 27°F | 46°F | 35°F | 3.9" |
| March | 38°F | 62°F | 49°F | 4.6" |
| April | 45°F | 68°F | 56°F | 6.4" |
| May | 57°F | 79°F | 68°F | 3.6" |
| June | 66°F | 87°F | 76°F | 8.9" |
| July | 67°F | 90°F | 79°F | 2.3" |
| August | 70°F | 91°F | 80°F | 13.2" |
| September | 61°F | 83°F | 71°F | 7.3" |
| October | 49°F | 71°F | 59°F | 4.0" |
| November | 37°F | 59°F | 47°F | 4.3" |
| December | 26°F | 43°F | 34°F | 4.1" |
| Index | Hermann | Missouri | National |
| Air quality index | 39 | 97 | 42 |
| Pollution index | 732,008 | 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 | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Big Spring, MO | 227 | 39 | 22.0% |
| McKittrick, MO | 69 | 39 | 22.0% |
| Rhineland, MO | 107 | 39 | 22.0% |
| Jonesburg, MO | 812 | 39 | 22.0% |
| Danville, MO | 0 | 39 | 22.0% |
| Hermann, MO | 2,375 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Piperton, TN | 2,375 | 45 | 10.0% |
| Whidbey Island Station, WA | 2,375 | 24 | 52.0% |
| Cimarron, KS | 2,376 | 15 | 70.0% |
| Stonewall, LA | 2,376 | 39 | 22.0% |
| Wray, CO | 2,377 | 45 | 10.0% |
| Hermann, MO | 2,375 | 39 | 22.0% |
Here are the best places to live in Missouri
These are the largest cities in Missouri
Check out the 10 safest cities in Missouri
See the best places to live in Hermann