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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 28°F | 47°F | 37°F | 2.7" | 
| February | 29°F | 50°F | 38°F | 2.3" | 
| March | 37°F | 60°F | 47°F | 3.2" | 
| April | 47°F | 71°F | 58°F | 3.4" | 
| May | 56°F | 78°F | 67°F | 4.6" | 
| June | 67°F | 87°F | 77°F | 5.3" | 
| July | 72°F | 91°F | 81°F | 4.2" | 
| August | 70°F | 90°F | 79°F | 3.2" | 
| September | 63°F | 83°F | 72°F | 3.5" | 
| October | 52°F | 72°F | 61°F | 5.0" | 
| November | 40°F | 61°F | 50°F | 2.5" | 
| December | 33°F | 52°F | 42°F | 3.8" | 
| Index | Barnaby Woods | Washington | District of Columbia | 
| Air quality index | 47 | 47 | 49 | 
| Pollution index | 14,693,900 | 5,554,010 | 5,554,010 | 
| Measurement | Total | 
| Days measured | 365 | 
| Days with good air quality | 209 | 
| Days with moderate air quality | 145 | 
| Days w/ poor A.Q. for sensitive groups | 10 | 
| Days with unhealthy air quality | 1 | 
| Pollutant | Total | 
| Arsenic | 0.010% | 
| Benzene | 0.060% | 
| Carbon Tetrachloride | 0.010% | 
| Lead | 0.004% | 
| Mercury | 0.010% | 
| City | Population | Air Quality Index | National Avg. | 
| North Laurel, MD | 24,856 | 46 | 8.0% | 
| Savage, MD | 6,849 | 46 | 8.0% | 
| Maryland City, MD | 17,681 | 46 | 8.0% | 
| Calverton, MD | 17,034 | 47 | 6.0% | 
| Glenarden, MD | 6,158 | 47 | 6.0% | 
| Washington, DC | 701,974 | 47 | 6.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Vancouver, BC | 694,440 | n/a | |
| Boston, MA | 689,326 | 43 | 14.0% | 
| Denver, CO | 715,878 | 58 | 16.0% | 
| El Paso, TX | 679,879 | 53 | 6.0% | 
| Detroit, MI | 672,351 | 56 | 12.0% | 
| Washington, DC | 701,974 | 47 | 6.0% |