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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 24°F | 43°F | 32°F | 1.8" | 
| February | 26°F | 45°F | 34°F | 1.6" | 
| March | 37°F | 59°F | 47°F | 3.7" | 
| April | 47°F | 70°F | 58°F | 5.3" | 
| May | 56°F | 78°F | 67°F | 4.8" | 
| June | 65°F | 88°F | 76°F | 4.4" | 
| July | 68°F | 90°F | 79°F | 3.9" | 
| August | 66°F | 89°F | 77°F | 3.1" | 
| September | 58°F | 82°F | 69°F | 4.2" | 
| October | 47°F | 71°F | 58°F | 3.1" | 
| November | 36°F | 58°F | 46°F | 2.8" | 
| December | 29°F | 45°F | 36°F | 3.1" | 
| Index | Marlborough | Missouri | National | 
| Air quality index | 54 | 97 | 42 | 
| Pollution index | 8,473,050 | 1,630,255 | 2,726,193 | 
| Measurement | Total | 
| Days measured | 365 | 
| Days with good air quality | 134 | 
| Days with moderate air quality | 221 | 
| Days w/ poor A.Q. for sensitive groups | 8 | 
| Days with unhealthy air quality | 2 | 
| Pollutant | Total | 
| Arsenic | 0.020% | 
| Benzene | 0.070% | 
| Carbon Tetrachloride | 0.020% | 
| Lead | 0.010% | 
| Mercury | 0.010% | 
| City | Population | Air Quality Index | National Avg. | 
| Brooklyn, IL | 428 | 54 | 8.0% | 
| Clayton, MO | 16,763 | 54 | 8.0% | 
| Fenton, MO | 4,033 | 54 | 8.0% | 
| Lakeshire, MO | 1,435 | 54 | 8.0% | 
| Richmond Heights, MO | 8,581 | 54 | 8.0% | 
| Marlborough, MO | 2,727 | 54 | 8.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Riverdale, CA | 2,727 | 56 | 12.0% | 
| Lake Arrowhead, ME | 2,727 | 40 | 20.0% | 
| Stigler, OK | 2,727 | 5 | 90.0% | 
| North Rock Springs, WY | 2,727 | 46 | 8.0% | 
| Stanstead, QC | 2,727 | n/a | |
| Marlborough, MO | 2,727 | 54 | 8.0% |