HERNDON, VIRGINIA

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Elevation: 98 meters Latitude: 38 57N Longitude: 077 27W

WEATHER

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Number of Records: 213,900; Date Range: 1/1/95 - 3/22/16

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WEATHER ALMANAC - 19 MAY, 2015

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[ °F ] °C

Weather Element	Average	High	Low
Temperature	21 ^°C	30 ^°C (3:52 pm)	(4:07 am)
Dewpoint	14.1 ^°C	19 ^°C (12:52 am)	(7:00 pm)
Humidity	65.7 ^%	99 ^% (2:52 am)	38 ^% (6:52 pm)
Barometer	1013.9 ^hPa	1016.9 hPa (12:52 am)	1010.2 hPa (6:52 pm)
Wind Speed	11.6 ^km/h	20.4 ^km/h (11:52 am)
Wind Gust		35.2 ^km/h (11:52 am)

Weather Element	Average
Visibility	13.8 ^km
Wind Direction	SSE (173.2 °)

Weather Element	Total
Precipitation	---
Heating Degree Days	12.2 (Base 18.3)

Averaged from 28 records on 19 May, 2015

WEATHER CONDITIONS BREAKOUT

WIND DIRECTION BREAKOUT

WEATHER BY HOUR - 19 MAY, 2015

[ °F ] °C

Local Time	Temperature	Dewpoint	Humidity	Barometer	Visibility	Wind Direction	Wind Speed	Gust Speed	Events	Conditions
12:52 AM	21 ^°C	19 ^°C	88 ^%	1016.9 hPa	16.1 ^km	Variable	11.1 ^km/h			Mostly Cloudy
1:52 AM	21 ^°C	19 ^°C	88 ^%	1016.3 hPa	16.1 ^km	Variable	9.3 ^km/h			Scattered Clouds
2:52 AM	19 ^°C	18.8 ^°C	99 ^%	1015.6 hPa	16.1 ^km	Variable	7.4 ^km/h			Mostly Cloudy
3:36 AM	20 ^°C	18 ^°C	88 ^%	1015.6 hPa	14.5 ^km	Variable	7.4 ^km/h			Scattered Clouds
3:52 AM	20.1 ^°C	18.4 ^°C	90 ^%	1015.2 hPa	9.7 ^km	Variable	7.4 ^km/h			Scattered Clouds
4:07 AM	-17.8 ^°C	-17.8 ^°C		1015.2 hPa	2.4 ^km	North				Mist
4:09 AM	-17.8 ^°C	-17.8 ^°C		1015.2 hPa	0.8 ^km	North			Fog	Fog
4:16 AM	20 ^°C	19 ^°C	94 ^%	1015.2 hPa	6.4 ^km	Variable	7.4 ^km/h			Scattered Clouds
4:52 AM	20 ^°C	19 ^°C	94 ^%	1014.9 hPa	6.4 ^km	Variable	7.4 ^km/h			Mostly Cloudy
5:52 AM	19 ^°C	15 ^°C	78 ^%	1014.6 hPa	12.9 ^km	Variable	7.4 ^km/h			Overcast
6:52 AM	19.4 ^°C	15 ^°C	76 ^%	1014.9 hPa	14.5 ^km	Calm				Mostly Cloudy
7:52 AM	20 ^°C	15 ^°C	73 ^%	1014.6 hPa	16.1 ^km	Calm				Mostly Cloudy
8:52 AM	20.6 ^°C	15 ^°C	70 ^%	1014.9 hPa	16.1 ^km	WNW (300°)	9.3 ^km/h			Mostly Cloudy
9:52 AM	23.9 ^°C	18.9 ^°C	73 ^%	1014.6 hPa	16.1 ^km	WNW (300°)	11.1 ^km/h			Mostly Cloudy
10:52 AM	25 ^°C	18.3 ^°C	66 ^%	1014.6 hPa	16.1 ^km	NW (310°)	14.8 ^km/h			Mostly Cloudy
11:52 AM	27.2 ^°C	18.9 ^°C	60 ^%	1014.2 hPa	16.1 ^km	NNW (330°)	20.4 ^km/h	35.2 ^km/h		Scattered Clouds
12:52 PM	27.8 ^°C	18.9 ^°C	58 ^%	1013.9 hPa	16.1 ^km	WNW (290°)	5.6 ^km/h			Scattered Clouds
1:52 PM	28.9 ^°C	17.2 ^°C	49 ^%	1013.2 hPa	16.1 ^km	West (280°)	20.4 ^km/h			Scattered Clouds
2:52 PM	28.9 ^°C	16.7 ^°C	47 ^%	1012.9 hPa	16.1 ^km	WNW (290°)	18.5 ^km/h			Mostly Cloudy
3:52 PM	30 ^°C	17.2 ^°C	46 ^%	1011.5 hPa	16.1 ^km	NW (310°)	11.1 ^km/h			Mostly Cloudy
4:52 PM	29 ^°C	16 ^°C	45 ^%	1011.2 hPa	16.1 ^km	WNW (290°)	16.7 ^km/h			Mostly Cloudy
5:52 PM	30 ^°C	15.6 ^°C	41 ^%	1010.5 hPa	16.1 ^km	WNW (300°)	18.5 ^km/h			Scattered Clouds
6:52 PM	29.4 ^°C	13.9 ^°C	38 ^%	1010.2 hPa	16.1 ^km	NW (310°)	14.8 ^km/h			Scattered Clouds
7:52 PM	27.8 ^°C	13.9 ^°C	42 ^%	1010.8 hPa	16.1 ^km	NW (310°)	11.1 ^km/h			Scattered Clouds
8:52 PM	26.1 ^°C	13.9 ^°C	47 ^%	1011.5 hPa	16.1 ^km	NW (320°)	14.8 ^km/h			Scattered Clouds
9:52 PM	23.9 ^°C	13.9 ^°C	53 ^%	1011.9 hPa	16.1 ^km	WNW (300°)	13 ^km/h			Partly Cloudy
10:52 PM	23.9 ^°C	12.8 ^°C	50 ^%	1012.2 hPa	16.1 ^km	NW (310°)	18.5 ^km/h			Clear
11:52 PM	21.7 ^°C	12.2 ^°C	55 ^%	1012.5 hPa	16.1 ^km	WNW (300°)	16.7 ^km/h			Clear

Hourly data recorded from KIAD, located 0 kilometers away from Herndon, Virginia