Annual Weather Averages Near 38°18'21.3"N, 77°28'48.4"W
Averages are for Shannon Airport, which is 3 miles from 38°18'21.3"N, 77°28'48.4"W.
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 89 °F
Low Temp: 25 °F
Mean Temp: 57 °F
Precipitation: 3.60"
Humidity: 70%
Dew Point: 47 °F
Wind: 9 mph
Pressure: 30.05 "Hg
Visibility: 9 mi
January Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 46 °F
Low Temp: 25 °F
Mean Temp: 36 °F
Precipitation: 2.69"
Humidity: 67%
Dew Point: 26 °F
Wind: 10 mph
Pressure: 30.10 "Hg
Visibility: 9 mi
February Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 49 °F
Low Temp: 27 °F
Mean Temp: 38 °F
Precipitation: 2.41"
Humidity: 64%
Dew Point: 27 °F
Wind: 10 mph
Pressure: 30.09 "Hg
Visibility: 9 mi
March Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 57 °F
Low Temp: 34 °F
Mean Temp: 45 °F
Precipitation: 3.54"
Humidity: 61%
Dew Point: 33 °F
Wind: 11 mph
Pressure: 30.06 "Hg
Visibility: 9 mi
April Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 69 °F
Low Temp: 43 °F
Mean Temp: 56 °F
Precipitation: 3.35"
Humidity: 62%
Dew Point: 43 °F
Wind: 11 mph
Pressure: 29.99 "Hg
Visibility: 9 mi
May Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 77 °F
Low Temp: 53 °F
Mean Temp: 65 °F
Precipitation: 4.31"
Humidity: 70%
Dew Point: 55 °F
Wind: 9 mph
Pressure: 30.00 "Hg
Visibility: 9 mi
June Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 85 °F
Low Temp: 63 °F
Mean Temp: 74 °F
Precipitation: 4.37"
Humidity: 72%
Dew Point: 64 °F
Wind: 8 mph
Pressure: 29.97 "Hg
Visibility: 9 mi
July Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 89 °F
Low Temp: 68 °F
Mean Temp: 78 °F
Precipitation: 4.65"
Humidity: 73%
Dew Point: 68 °F
Wind: 7 mph
Pressure: 29.98 "Hg
Visibility: 9 mi
August Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 87 °F
Low Temp: 66 °F
Mean Temp: 77 °F
Precipitation: 4.26"
Humidity: 76%
Dew Point: 68 °F
Wind: 7 mph
Pressure: 30.01 "Hg
Visibility: 9 mi
September Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 81 °F
Low Temp: 59 °F
Mean Temp: 70 °F
Precipitation: 4.22"
Humidity: 77%
Dew Point: 61 °F
Wind: 7 mph
Pressure: 30.05 "Hg
Visibility: 9 mi
October Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 70 °F
Low Temp: 46 °F
Mean Temp: 58 °F
Precipitation: 3.55"
Humidity: 77%
Dew Point: 50 °F
Wind: 8 mph
Pressure: 30.07 "Hg
Visibility: 9 mi
November Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 59 °F
Low Temp: 35 °F
Mean Temp: 47 °F
Precipitation: 2.87"
Humidity: 71%
Dew Point: 37 °F
Wind: 8 mph
Pressure: 30.12 "Hg
Visibility: 9 mi
December Climate & Weather Averages in 38°18'21.3"N, 77°28'48.4"W
High Temp: 50 °F
Low Temp: 29 °F
Mean Temp: 40 °F
Precipitation: 2.94"
Humidity: 71%
Dew Point: 30 °F
Wind: 8 mph
Pressure: 30.12 "Hg
Visibility: 9 mi