| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 39°F | 30°F | 3.4" |
| February | 26°F | 44°F | 34°F | 4.5" |
| March | 39°F | 60°F | 48°F | 4.2" |
| April | 46°F | 65°F | 55°F | 5.0" |
| May | 57°F | 77°F | 66°F | 15.6" |
| June | 66°F | 84°F | 75°F | 13.9" |
| July | 69°F | 89°F | 79°F | 4.9" |
| August | 71°F | 90°F | 80°F | 14.0" |
| September | 63°F | 83°F | 72°F | 4.6" |
| October | 50°F | 68°F | 58°F | 4.6" |
| November | 38°F | 58°F | 47°F | 2.7" |
| December | 24°F | 39°F | 31°F | 2.8" |
| Index | Pleasant Hill | Missouri | National |
| Air quality index | 47 | 97 | 42 |
| Pollution index | 1,867,810 | 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 | 0.004% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Freeman, MO | 485 | 47 | 6.0% |
| La Tour, MO | 157 | 47 | 6.0% |
| Raytown, MO | 29,176 | 47 | 6.0% |
| Greenwood, MO | 6,067 | 47 | 6.0% |
| Lone Jack, MO | 1,379 | 47 | 6.0% |
| Pleasant Hill, MO | 8,611 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Willowbrook, IL | 8,610 | 55 | 10.0% |
| Perryton, TX | 8,609 | 44 | 12.0% |
| Nantucket, MA | 8,606 | 36 | 28.0% |
| Paris, IL | 8,616 | 45 | 10.0% |
| Stuttgart, AR | 8,617 | 45 | 10.0% |
| Pleasant Hill, MO | 8,611 | 47 | 6.0% |
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