Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 29°F | 44°F | 36°F | 4.8" |
February | 29°F | 45°F | 36°F | 3.9" |
March | 36°F | 54°F | 44°F | 5.5" |
April | 47°F | 66°F | 55°F | 5.8" |
May | 56°F | 73°F | 64°F | 6.3" |
June | 67°F | 83°F | 74°F | 6.4" |
July | 71°F | 86°F | 78°F | 6.7" |
August | 70°F | 84°F | 77°F | 7.1" |
September | 65°F | 80°F | 72°F | 5.9" |
October | 53°F | 69°F | 61°F | 6.4" |
November | 42°F | 58°F | 49°F | 5.2" |
December | 33°F | 48°F | 40°F | 5.9" |
Index | Herald Harbor | Maryland | National |
Air quality index | 46 | 43 | 42 |
Pollution index | 3,494,010 | 5,342,367 | 2,726,193 |
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 | 0.040% |
Carbon Tetrachloride | 0.002% |
Lead | 0.010% |
Mercury | 0.001% |
City | Population | Air Quality Index | National Avg. |
Pasadena, MD | 29,432 | 46 | 8.0% |
Edgewater, MD | 8,850 | 46 | 8.0% |
Ferndale, MD | 17,732 | 46 | 8.0% |
Linthicum, MD | 10,116 | 46 | 8.0% |
Annapolis, MD | 39,321 | 46 | 8.0% |
Herald Harbor, MD | 2,414 | 46 | 8.0% |
City | Population | Air Quality Index | National Avg. |
Excelsior, MN | 2,414 | 46 | 8.0% |
Richwood, OH | 2,414 | 46 | 8.0% |
Wright-Patterson AFB, OH | 2,414 | 47 | 6.0% |
Edgemont Park, MI | 2,413 | 36 | 28.0% |
Bayard, NM | 2,415 | 37 | 26.0% |
Herald Harbor, MD | 2,414 | 46 | 8.0% |