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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 28°F | 44°F | 35°F | 6.3" | 
| February | 28°F | 46°F | 36°F | 4.5" | 
| March | 35°F | 55°F | 44°F | 6.6" | 
| April | 45°F | 66°F | 55°F | 6.3" | 
| May | 55°F | 75°F | 64°F | 5.8" | 
| June | 64°F | 83°F | 73°F | 8.1" | 
| July | 69°F | 87°F | 78°F | 10.2" | 
| August | 67°F | 85°F | 76°F | 9.2" | 
| September | 61°F | 79°F | 69°F | 9.7" | 
| October | 50°F | 69°F | 59°F | 9.2" | 
| November | 39°F | 58°F | 48°F | 5.9" | 
| December | 33°F | 50°F | 41°F | 7.5" | 
| Index | Barclay | 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. | 
| Ridgely, MD | 1,956 | 42 | 16.0% | 
| Clayton, DE | 3,393 | 42 | 16.0% | 
| Galena, MD | 758 | 42 | 16.0% | 
| Marydel, MD | 241 | 42 | 16.0% | 
| Sudlersville, MD | 423 | 42 | 16.0% | 
| Barclay, MD | 239 | 42 | 16.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Upper Kalskag, AK | 239 | 31 | 38.0% | 
| Bakerhill, AL | 239 | 35 | 30.0% | 
| Fredonia (Biscoe), AR | 239 | 45 | 10.0% | 
| Cushing, IA | 239 | 35 | 30.0% | 
| Metcalf, IL | 239 | 45 | 10.0% | 
| Barclay, MD | 239 | 42 | 16.0% |