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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 32°F | 44°F | 37°F | 2.7" | 
| February | 32°F | 45°F | 38°F | 2.7" | 
| March | 40°F | 55°F | 47°F | 3.4" | 
| April | 51°F | 68°F | 59°F | 3.8" | 
| May | 60°F | 76°F | 67°F | 3.9" | 
| June | 70°F | 86°F | 77°F | 4.5" | 
| July | 75°F | 90°F | 82°F | 5.0" | 
| August | 73°F | 87°F | 79°F | 4.6" | 
| September | 67°F | 80°F | 73°F | 4.4" | 
| October | 55°F | 69°F | 62°F | 4.6" | 
| November | 45°F | 58°F | 50°F | 2.4" | 
| December | 37°F | 48°F | 42°F | 4.1" | 
| Index | Jonestown | Baltimore | Maryland | 
| Air quality index | 46 | 46 | 43 | 
| Pollution index | 9,823,920 | 9,823,920 | 5,342,367 | 
| 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 | 0.070% | 
| Carbon Tetrachloride | 0.050% | 
| Lead | 0.030% | 
| Mercury | 0.140% | 
| City | Population | Air Quality Index | National Avg. | 
| Fairwood, MD | 6,780 | 46 | 8.0% | 
| Severna Park, MD | 38,729 | 46 | 8.0% | 
| Elkridge, MD | 21,778 | 46 | 8.0% | 
| Lansdowne, MD | 8,635 | 46 | 8.0% | 
| Kingsville, MD | 4,649 | 46 | 8.0% | 
| Baltimore, MD | 602,274 | 46 | 8.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Milwaukee, WI | 592,649 | 44 | 12.0% | 
| Louisville, KY | 618,733 | 49 | 2.0% | 
| Albuquerque, NM | 560,447 | 53 | 6.0% | 
| Surrey, BC | 560,150 | n/a | |
| Las Vegas, NV | 644,594 | 54 | 8.0% | 
| Baltimore, MD | 602,274 | 46 | 8.0% |