| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 40°F | 28°F | 1.2" |
| February | 21°F | 42°F | 30°F | 2.0" |
| March | 35°F | 58°F | 45°F | 3.4" |
| April | 44°F | 68°F | 55°F | 4.2" |
| May | 54°F | 76°F | 65°F | 5.0" |
| June | 65°F | 86°F | 75°F | 6.2" |
| July | 68°F | 89°F | 78°F | 4.6" |
| August | 66°F | 87°F | 76°F | 5.3" |
| September | 57°F | 80°F | 67°F | 4.1" |
| October | 46°F | 69°F | 56°F | 3.5" |
| November | 34°F | 56°F | 44°F | 2.4" |
| December | 23°F | 42°F | 32°F | 2.2" |
| Index | Brookfield | Missouri | National |
| Air quality index | 38 | 97 | 42 |
| Pollution index | 360,308 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Laclede, MO | 322 | 38 | 24.0% |
| Purdin, MO | 105 | 38 | 24.0% |
| Linneus, MO | 217 | 38 | 24.0% |
| Marceline, MO | 2,012 | 38 | 24.0% |
| Hale, MO | 445 | 38 | 24.0% |
| Brookfield, MO | 4,265 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Cariboo L, BC | 4,265 | n/a | |
| Cariboo E, BC | 4,264 | n/a | |
| Adamsville, AL | 4,266 | 53 | 6.0% |
| Meadow Lake, NM | 4,266 | 53 | 6.0% |
| Lyons, GA | 4,263 | 26 | 48.0% |
| Brookfield, MO | 4,265 | 38 | 24.0% |
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