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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 29°F | 43°F | 36°F | 2.7" | 
| February | 30°F | 45°F | 37°F | 7.4" | 
| March | 37°F | 55°F | 45°F | 3.9" | 
| April | 47°F | 67°F | 57°F | 2.4" | 
| May | 57°F | 76°F | 66°F | 4.8" | 
| June | 66°F | 84°F | 75°F | 8.6" | 
| July | 71°F | 88°F | 79°F | 10.7" | 
| August | 68°F | 85°F | 76°F | 8.2" | 
| September | 62°F | 80°F | 71°F | 5.1" | 
| October | 52°F | 68°F | 60°F | 4.5" | 
| November | 41°F | 57°F | 49°F | 4.8" | 
| December | 35°F | 48°F | 41°F | 3.2" | 
| Index | Tilghman Island | Maryland | National | 
| Air quality index | 41 | 43 | 42 | 
| Pollution index | 1,716,960 | 5,342,367 | 2,726,193 | 
| Measurement | Total | 
| Days measured | 365 | 
| Days with good air quality | 304 | 
| Days with moderate air quality | 58 | 
| Days w/ poor A.Q. for sensitive groups | 3 | 
| Days with unhealthy air quality | 0 | 
| Pollutant | Total | 
| Arsenic | 0.001% | 
| Benzene | 0.020% | 
| Carbon Tetrachloride | 0.004% | 
| Lead | 0.000% | 
| Mercury | 0.002% | 
| City | Population | Air Quality Index | National Avg. | 
| Chesapeake Beach, MD | 5,996 | 41 | 18.0% | 
| Oxford, MD | 827 | 41 | 18.0% | 
| Prince Frederick, MD | 2,709 | 41 | 18.0% | 
| Algonquin, MD | 1,110 | 41 | 18.0% | 
| St. Michaels, MD | 1,311 | 41 | 18.0% | 
| Tilghman Island, MD | 831 | 41 | 18.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Hardin, IL | 831 | 54 | 8.0% | 
| Pearl City, IL | 831 | 42 | 16.0% | 
| Ridgway, IL | 831 | 45 | 10.0% | 
| Annville, KY | 831 | 33 | 34.0% | 
| Libertytown, MD | 831 | 42 | 16.0% | 
| Tilghman Island, MD | 831 | 41 | 18.0% |