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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 30°F | 46°F | 37°F | 5.9" | 
| February | 26°F | 41°F | 33°F | 2.7" | 
| March | 35°F | 53°F | 42°F | 8.4" | 
| April | 44°F | 63°F | 52°F | 13.3" | 
| May | 52°F | 72°F | 61°F | 6.7" | 
| June | 65°F | 82°F | 73°F | 10.2" | 
| July | 69°F | 85°F | 77°F | 6.5" | 
| August | 70°F | 86°F | 77°F | 8.9" | 
| September | 62°F | 82°F | 71°F | 4.4" | 
| October | 54°F | 71°F | 61°F | 16.4" | 
| November | 41°F | 58°F | 48°F | 6.6" | 
| December | 31°F | 46°F | 37°F | 5.9" | 
| Index | Marydel | Maryland | National | 
| Air quality index | 42 | 43 | 42 | 
| Pollution index | 3,193,180 | 5,342,367 | 2,726,193 | 
| Measurement | Total | 
| Days measured | 365 | 
| Days with good air quality | 293 | 
| Days with moderate air quality | 72 | 
| Days w/ poor A.Q. for sensitive groups | 0 | 
| Days with unhealthy air quality | 0 | 
| Pollutant | Total | 
| Arsenic | 0.010% | 
| Benzene | 0.030% | 
| Carbon Tetrachloride | 0.000% | 
| Lead | 0.010% | 
| Mercury | 0.020% | 
| City | Population | Air Quality Index | National Avg. | 
| Hillsboro, MD | 101 | 36 | 28.0% | 
| Queen Anne, MD | 1,183 | 36 | 28.0% | 
| Queen Anne town, MD | 290 | 36 | 28.0% | 
| Harrington, DE | 3,658 | 42 | 16.0% | 
| Leipsic, DE | 141 | 42 | 16.0% | 
| Marydel, MD | 241 | 42 | 16.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Homewood Canyon, CA | 241 | 15 | 70.0% | 
| Lanare, CA | 241 | 56 | 12.0% | 
| La Motte, IA | 241 | 29 | 42.0% | 
| Rose Hill, IA | 241 | 35 | 30.0% | 
| Anchor, IL | 241 | 44 | 12.0% | 
| Marydel, MD | 241 | 42 | 16.0% |