History
Weather Station: Washington-Dulles International Airport , VA , US
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Averages
Average High Temperature 4.40 °C	Average Low Temperature -6.10 °C
Average Mean Temp -0.60 °C	Average Dew Point -6.10 °C
Average Windspeed 20.40 km/h	Average Wind Direction 315.0
Average Morning Relative Humidity 76.0	Average Afternoon Relative Humidity 56.0
Typical Sky Cover OVR	Average Precipitation (US Only) 7.11
Average Snowfall (US Only) 20.30
Daily Counts
Days With Precipitation 10	Days With Thunderstorms *
Days With Fog 12	Days With Snow 4
Days With Lows Below Freezing 26	Days above 90° F (32.2° C) 0
Records
Record High 23.90 °C	Record Low -27.80 °C
Record Wind Speed 100.00 km/h	Record Monthly Snowfall 73.6 cm
Record 24-hour Snowfall 27.90 cm	Record Monthly Rainfall 168 mm
Record 24-hour Rainfall 41 mm	Record Minimum Monthly Precipitation 1.02 mm

Averages
Average High Temperature 6.70 °C	Average Low Temperature -5.00 °C
Average Mean Temp 1.10 °C	Average Dew Point -5.60 °C
Average Windspeed 20.40 km/h	Average Wind Direction 315.0
Average Morning Relative Humidity 77.0	Average Afternoon Relative Humidity 52.0
Typical Sky Cover OVR	Average Precipitation (US Only) 7.11
Average Snowfall (US Only) 17.80
Daily Counts
Days With Precipitation 9	Days With Thunderstorms *
Days With Fog 10	Days With Snow 3
Days With Lows Below Freezing 23	Days above 90° F (32.2° C) 0
Records
Record High 26.10 °C	Record Low -25.60 °C
Record Wind Speed 85.20 km/h	Record Monthly Snowfall 71.1 cm
Record 24-hour Snowfall 58.40 cm	Record Monthly Rainfall 147 mm
Record 24-hour Rainfall 53 mm	Record Minimum Monthly Precipitation 0.51 mm

Averages
Average High Temperature 12.80 °C	Average Low Temperature 0.00 °C
Average Mean Temp 6.70 °C	Average Dew Point -1.10 °C
Average Windspeed 20.40 km/h	Average Wind Direction 315.0
Average Morning Relative Humidity 77.0	Average Afternoon Relative Humidity 48.0
Typical Sky Cover OVR	Average Precipitation (US Only) 7.87
Average Snowfall (US Only) 7.60
Daily Counts
Days With Precipitation 10	Days With Thunderstorms 1
Days With Fog 11	Days With Snow 2
Days With Lows Below Freezing 17	Days above 90° F (32.2° C) 0
Records
Record High 31.70 °C	Record Low -14.40 °C
Record Wind Speed 98.20 km/h	Record Monthly Snowfall 27.9 cm
Record 24-hour Snowfall 15.20 cm	Record Monthly Rainfall 147 mm
Record 24-hour Rainfall 46 mm	Record Minimum Monthly Precipitation 2.54 mm

Averages
Average High Temperature 18.30 °C	Average Low Temperature 4.40 °C
Average Mean Temp 11.70 °C	Average Dew Point 3.90 °C
Average Windspeed 20.40 km/h	Average Wind Direction 315.0
Average Morning Relative Humidity 77.0	Average Afternoon Relative Humidity 46.0
Typical Sky Cover OVR	Average Precipitation (US Only) 7.87
Average Snowfall (US Only) *
Daily Counts
Days With Precipitation 10	Days With Thunderstorms 2
Days With Fog 11	Days With Snow *
Days With Lows Below Freezing 6	Days above 90° F (32.2° C) *
Records
Record High 33.30 °C	Record Low -8.30 °C
Record Wind Speed 109.30 km/h	Record Monthly Snowfall 10.2 cm
Record 24-hour Snowfall 7.60 cm	Record Monthly Rainfall 185 mm
Record 24-hour Rainfall 53 mm	Record Minimum Monthly Precipitation 0.76 mm

Averages
Average High Temperature 23.30 °C	Average Low Temperature 10.00 °C
Average Mean Temp 17.20 °C	Average Dew Point 10.60 °C
Average Windspeed 13.00 km/h	Average Wind Direction 180.0
Average Morning Relative Humidity 82.0	Average Afternoon Relative Humidity 53.0
Typical Sky Cover OVR	Average Precipitation (US Only) 10.15
Average Snowfall (US Only) *
Daily Counts
Days With Precipitation 12	Days With Thunderstorms 4
Days With Fog 15	Days With Snow 0
Days With Lows Below Freezing *	Days above 90° F (32.2° C) 1
Records
Record High 36.10 °C	Record Low -2.20 °C
Record Wind Speed 85.20 km/h	Record Monthly Snowfall * cm
Record 24-hour Snowfall * cm	Record Monthly Rainfall 261 mm
Record 24-hour Rainfall 79 mm	Record Minimum Monthly Precipitation 2.03 mm

Averages
Average High Temperature 28.30 °C	Average Low Temperature 15.00 °C
Average Mean Temp 21.70 °C	Average Dew Point 16.10 °C
Average Windspeed 11.10 km/h	Average Wind Direction 180.0
Average Morning Relative Humidity 84.0	Average Afternoon Relative Humidity 54.0
Typical Sky Cover OVR	Average Precipitation (US Only) 9.90
Average Snowfall (US Only) 0.00
Daily Counts
Days With Precipitation 10	Days With Thunderstorms 6
Days With Fog 16	Days With Snow 0
Days With Lows Below Freezing 0	Days above 90° F (32.2° C) 5
Records
Record High 37.80 °C	Record Low 2.20 °C
Record Wind Speed 118.50 km/h	Record Monthly Snowfall 0.0 cm
Record 24-hour Snowfall 0.00 cm	Record Monthly Rainfall 462 mm
Record 24-hour Rainfall 279 mm	Record Minimum Monthly Precipitation 1.27 mm

Averages
Average High Temperature 30.60 °C	Average Low Temperature 17.80 °C
Average Mean Temp 24.40 °C	Average Dew Point 18.30 °C
Average Windspeed 11.10 km/h	Average Wind Direction 180.0
Average Morning Relative Humidity 85.0	Average Afternoon Relative Humidity 54.0
Typical Sky Cover OVR	Average Precipitation (US Only) 8.88
Average Snowfall (US Only) 0.00
Daily Counts
Days With Precipitation 10	Days With Thunderstorms 6
Days With Fog 19	Days With Snow 0
Days With Lows Below Freezing 0	Days above 90° F (32.2° C) 11
Records
Record High 40.00 °C	Record Low 5.00 °C
Record Wind Speed 125.90 km/h	Record Monthly Snowfall 0.0 cm
Record 24-hour Snowfall 0.00 cm	Record Monthly Rainfall 180 mm
Record 24-hour Rainfall 66 mm	Record Minimum Monthly Precipitation 2.28 mm

Averages
Average High Temperature 30.00 °C	Average Low Temperature 17.20 °C
Average Mean Temp 23.30 °C	Average Dew Point 17.80 °C
Average Windspeed 11.10 km/h	Average Wind Direction 180.0
Average Morning Relative Humidity 88.0	Average Afternoon Relative Humidity 55.0
Typical Sky Cover OVR	Average Precipitation (US Only) 10.15
Average Snowfall (US Only) 0.00
Daily Counts
Days With Precipitation 10	Days With Thunderstorms 5
Days With Fog 21	Days With Snow 0
Days With Lows Below Freezing 0	Days above 90° F (32.2° C) 8
Records
Record High 40.00 °C	Record Low 3.30 °C
Record Wind Speed 109.30 km/h	Record Monthly Snowfall 0.0 cm
Record 24-hour Snowfall 0.00 cm	Record Monthly Rainfall 272 mm
Record 24-hour Rainfall 119 mm	Record Minimum Monthly Precipitation 2.03 mm

Averages
Average High Temperature 26.10 °C	Average Low Temperature 12.80 °C
Average Mean Temp 19.40 °C	Average Dew Point 14.40 °C
Average Windspeed 11.10 km/h	Average Wind Direction 180.0
Average Morning Relative Humidity 89.0	Average Afternoon Relative Humidity 55.0
Typical Sky Cover OVR	Average Precipitation (US Only) 8.63
Average Snowfall (US Only) 0.00
Daily Counts
Days With Precipitation 8	Days With Thunderstorms 2
Days With Fog 19	Days With Snow 0
Days With Lows Below Freezing *	Days above 90° F (32.2° C) 3
Records
Record High 37.20 °C	Record Low -1.10 °C
Record Wind Speed 87.00 km/h	Record Monthly Snowfall 0.0 cm
Record 24-hour Snowfall 0.00 cm	Record Monthly Rainfall 287 mm
Record 24-hour Rainfall 140 mm	Record Minimum Monthly Precipitation 1.52 mm

Averages
Average High Temperature 20.00 °C	Average Low Temperature 5.60 °C
Average Mean Temp 12.80 °C	Average Dew Point 7.20 °C
Average Windspeed 11.10 km/h	Average Wind Direction 180.0
Average Morning Relative Humidity 88.0	Average Afternoon Relative Humidity 52.0
Typical Sky Cover OVR	Average Precipitation (US Only) 8.38
Average Snowfall (US Only) *
Daily Counts
Days With Precipitation 8	Days With Thunderstorms 1
Days With Fog 15	Days With Snow *
Days With Lows Below Freezing 5	Days above 90° F (32.2° C) *
Records
Record High 32.20 °C	Record Low -9.40 °C
Record Wind Speed 83.30 km/h	Record Monthly Snowfall 2.5 cm
Record 24-hour Snowfall 2.50 cm	Record Monthly Rainfall 234 mm
Record 24-hour Rainfall 104 mm	Record Minimum Monthly Precipitation * mm

Averages
Average High Temperature 13.90 °C	Average Low Temperature 1.10 °C
Average Mean Temp 7.80 °C	Average Dew Point 1.70 °C
Average Windspeed 18.50 km/h	Average Wind Direction 315.0
Average Morning Relative Humidity 83.0	Average Afternoon Relative Humidity 54.0
Typical Sky Cover OVR	Average Precipitation (US Only) 8.12
Average Snowfall (US Only) 2.50
Daily Counts
Days With Precipitation 9	Days With Thunderstorms 1
Days With Fog 12	Days With Snow 1
Days With Lows Below Freezing 15	Days above 90° F (32.2° C) 0
Records
Record High 28.90 °C	Record Low -12.80 °C
Record Wind Speed 85.20 km/h	Record Monthly Snowfall 27.9 cm
Record 24-hour Snowfall 27.90 cm	Record Monthly Rainfall 198 mm
Record 24-hour Rainfall 61 mm	Record Minimum Monthly Precipitation 0.51 mm

Averages
Average High Temperature 7.20 °C	Average Low Temperature -3.30 °C
Average Mean Temp 2.20 °C	Average Dew Point -3.30 °C
Average Windspeed 20.40 km/h	Average Wind Direction 315.0
Average Morning Relative Humidity 78.0	Average Afternoon Relative Humidity 57.0
Typical Sky Cover OVR	Average Precipitation (US Only) 8.12
Average Snowfall (US Only) 10.20
Daily Counts
Days With Precipitation 10	Days With Thunderstorms *
Days With Fog 12	Days With Snow 2
Days With Lows Below Freezing 24	Days above 90° F (32.2° C) 0
Records
Record High 25.60 °C	Record Low -20.00 °C
Record Wind Speed 100.00 km/h	Record Monthly Snowfall 60.9 cm
Record 24-hour Snowfall 27.90 cm	Record Monthly Rainfall 170 mm
Record 24-hour Rainfall 74 mm	Record Minimum Monthly Precipitation 1.02 mm