| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 44°F | 31°F | 2.0" |
| February | 23°F | 47°F | 33°F | 2.1" |
| March | 35°F | 61°F | 46°F | 3.0" |
| April | 44°F | 71°F | 57°F | 5.7" |
| May | 53°F | 78°F | 65°F | 4.3" |
| June | 63°F | 87°F | 75°F | 4.8" |
| July | 67°F | 90°F | 78°F | 5.1" |
| August | 65°F | 89°F | 76°F | 3.9" |
| September | 57°F | 82°F | 69°F | 4.8" |
| October | 45°F | 71°F | 57°F | 3.9" |
| November | 35°F | 59°F | 46°F | 2.4" |
| December | 25°F | 45°F | 34°F | 2.7" |
| Index | Martinsburg | Missouri | National |
| Air quality index | 38 | 97 | 42 |
| Pollution index | 964,937 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 239 |
| Days with moderate air quality | 6 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.130% |
| Mercury | 0.120% |
| City | Population | Air Quality Index | National Avg. |
| Benton City, MO | 139 | 38 | 24.0% |
| Montgomery City, MO | 2,659 | 38 | 24.0% |
| Farber, MO | 406 | 38 | 24.0% |
| Laddonia, MO | 579 | 38 | 24.0% |
| Rush Hill, MO | 183 | 38 | 24.0% |
| Martinsburg, MO | 577 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Fields Landing, CA | 577 | 27 | 46.0% |
| Chaplin, KY | 577 | 49 | 2.0% |
| Cedarville, MD | 577 | 47 | 6.0% |
| Oak Hill, MI | 577 | 36 | 28.0% |
| Austinburg, OH | 577 | 34 | 32.0% |
| Martinsburg, MO | 577 | 38 | 24.0% |
Here are the best places to live in Missouri
Most Dangerous Cities In The US
Check out the 10 safest cities in Missouri
See the best places to live in Martinsburg