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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 29°F | 44°F | 36°F | 4.8" | 
| February | 29°F | 45°F | 36°F | 3.9" | 
| March | 36°F | 54°F | 44°F | 5.5" | 
| April | 47°F | 66°F | 55°F | 5.8" | 
| May | 56°F | 73°F | 64°F | 6.3" | 
| June | 67°F | 83°F | 74°F | 6.4" | 
| July | 71°F | 86°F | 78°F | 6.7" | 
| August | 70°F | 84°F | 77°F | 7.1" | 
| September | 65°F | 80°F | 72°F | 5.9" | 
| October | 53°F | 69°F | 61°F | 6.4" | 
| November | 42°F | 58°F | 49°F | 5.2" | 
| December | 33°F | 48°F | 40°F | 5.9" | 
| Index | Cape St. Claire | Maryland | National | 
| Air quality index | 46 | 43 | 42 | 
| Pollution index | 3,494,010 | 5,342,367 | 2,726,193 | 
| Measurement | Total | 
| Days measured | 365 | 
| Days with good air quality | 223 | 
| Days with moderate air quality | 129 | 
| Days w/ poor A.Q. for sensitive groups | 13 | 
| Days with unhealthy air quality | 0 | 
| Pollutant | Total | 
| Arsenic | 0.010% | 
| Benzene | 0.040% | 
| Carbon Tetrachloride | 0.002% | 
| Lead | 0.010% | 
| Mercury | 0.001% | 
| City | Population | Air Quality Index | National Avg. | 
| Grasonville, MD | 3,578 | 41 | 18.0% | 
| Queenstown, MD | 950 | 41 | 18.0% | 
| Glen Burnie, MD | 69,649 | 46 | 8.0% | 
| Rock Hall, MD | 1,563 | 46 | 8.0% | 
| Annapolis Neck, MD | 13,049 | 46 | 8.0% | 
| Cape St. Claire, MD | 8,405 | 46 | 8.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Arab, AL | 8,405 | 44 | 12.0% | 
| Socorro, NM | 8,406 | 53 | 6.0% | 
| Salem, UT | 8,403 | 46 | 8.0% | 
| Kapuskasing, ON | 8,403 | n/a | |
| Greenville, MI | 8,407 | 38 | 24.0% | 
| Cape St. Claire, MD | 8,405 | 46 | 8.0% |