Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 24°F | 39°F | 31°F | 2.9" |
February | 26°F | 42°F | 33°F | 2.8" |
March | 34°F | 53°F | 43°F | 4.1" |
April | 44°F | 65°F | 54°F | 4.9" |
May | 53°F | 73°F | 63°F | 4.8" |
June | 62°F | 82°F | 71°F | 5.4" |
July | 66°F | 86°F | 76°F | 4.0" |
August | 64°F | 84°F | 73°F | 4.2" |
September | 58°F | 77°F | 67°F | 5.2" |
October | 48°F | 67°F | 57°F | 5.8" |
November | 38°F | 55°F | 46°F | 3.1" |
December | 31°F | 45°F | 38°F | 4.6" |
Index | Fort Ritchie | Maryland | National |
Air quality index | 40 | 43 | 42 |
Pollution index | 5,553,870 | 5,342,367 | 2,726,193 |
Measurement | Total |
Days measured | 362 |
Days with good air quality | 306 |
Days with moderate air quality | 54 |
Days w/ poor A.Q. for sensitive groups | 2 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.004% |
Benzene | 0.070% |
Carbon Tetrachloride | 0.010% |
Lead | 0.410% |
Mercury | 0.070% |
City | Population | Air Quality Index | National Avg. |
Mont Alto, PA | 1,756 | 36 | 28.0% |
Fayetteville, PA | 2,855 | 36 | 28.0% |
Marion, PA | 1,551 | 36 | 28.0% |
Guilford, PA | 3,571 | 36 | 28.0% |
Cearfoss, MD | 115 | 40 | 20.0% |
Fort Ritchie, MD | 48 | 40 | 20.0% |
City | Population | Air Quality Index | National Avg. |
Chenega, AK | 48 | 31 | 38.0% |
Morrison Bluff, AR | 48 | 36 | 28.0% |
Johannesburg, CA | 48 | 67 | 34.0% |
Robinson Mill, CA | 48 | 44 | 12.0% |
Cobbtown, FL | 48 | 41 | 18.0% |
Fort Ritchie, MD | 48 | 40 | 20.0% |