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 | Preston | Maryland | National |
Air quality index | 41 | 43 | 42 |
Pollution index | 1,358,370 | 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 | 0.000% |
Benzene | 0.020% |
Carbon Tetrachloride | 0.002% |
Lead | 0.000% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Brookview, MD | 51 | 36 | 28.0% |
Denton, MD | 4,488 | 36 | 28.0% |
Federalsburg, MD | 2,668 | 36 | 28.0% |
Sharptown, MD | 687 | 36 | 28.0% |
Galestown, MD | 72 | 36 | 28.0% |
Preston, MD | 861 | 41 | 18.0% |
City | Population | Air Quality Index | National Avg. |
Rancho Mesa Verde, AZ | 861 | 45 | 10.0% |
Happy Camp, CA | 861 | 20 | 60.0% |
Linn Valley, KS | 861 | 47 | 6.0% |
Heritage Creek, KY | 861 | 49 | 2.0% |
Utica, MS | 861 | 44 | 12.0% |
Preston, MD | 861 | 41 | 18.0% |