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| 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 | Jefferson City | Missouri | National |
| Air quality index | 39 | 97 | 42 |
| Pollution index | 1,482,560 | 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 | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ashland, MO | 3,956 | 38 | 24.0% |
| St. Thomas, MO | 292 | 39 | 22.0% |
| St. Martins, MO | 1,161 | 39 | 22.0% |
| New Bloomfield, MO | 755 | 39 | 22.0% |
| Wardsville, MO | 1,728 | 39 | 22.0% |
| Jefferson City, MO | 42,670 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Farmers Branch, TX | 42,659 | 51 | 2.0% |
| Mankato, MN | 42,685 | 46 | 8.0% |
| Langford, BC | 42,691 | n/a | |
| Burlington, VT | 42,645 | 37 | 26.0% |
| Brentwood, TN | 42,700 | 45 | 10.0% |
| Jefferson City, MO | 42,670 | 39 | 22.0% |
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