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 - 21 MAY, 2015

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[ °F ] °C

Weather Element	Average	High	Low
Temperature	11.7 ^°C	14.4 ^°C (1:52 am)	10 ^°C (12:52 pm)
Dewpoint	8.6 ^°C	10 ^°C (10:21 am)	5 ^°C (1:52 am)
Humidity	82.2 ^%	94 ^% (10:52 am)	53 ^% (1:52 am)
Barometer	1015.2 ^hPa	1016.6 hPa (9:52 am)	1013.2 hPa (5:52 pm)
Wind Speed	6.4 ^km/h	16.7 ^km/h (11:52 am)

Weather Element	Average
Visibility	12.4 ^km
Wind Direction	ENE (82.1 °)

Weather Element	Total
Precipitation	13.72 ^mm
Heating Degree Days	6.2 (Base 18.3)
Growing Degree Days	2.2 (Base 10)

Averaged from 34 records on 21 May, 2015

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WIND DIRECTION BREAKOUT

WEATHER BY HOUR - 21 MAY, 2015

[ °F ] °C

Local Time	Temperature	Dewpoint	Humidity	Barometer	Visibility	Wind Direction	Wind Speed	Precipitation	Events	Conditions
12:52 AM	13.9 ^°C	6.1 ^°C	59 ^%	1016.3 hPa	16.1 ^km	NE (40°)	5.6 ^km/h			Overcast
1:52 AM	14.4 ^°C	5 ^°C	53 ^%	1015.9 hPa	16.1 ^km	Calm				Overcast
2:52 AM	13.3 ^°C	8.3 ^°C	72 ^%	1015.9 hPa	16.1 ^km	Calm				Overcast
3:52 AM	13.3 ^°C	8.3 ^°C	72 ^%	1015.9 hPa	16.1 ^km	Calm				Overcast
4:52 AM	13.3 ^°C	7.8 ^°C	69 ^%	1015.6 hPa	16.1 ^km	Calm				Overcast
5:52 AM	13.9 ^°C	6.1 ^°C	59 ^%	1015.2 hPa	16.1 ^km	ENE (60°)	7.4 ^km/h			Overcast
6:52 AM	13.9 ^°C	6.1 ^°C	59 ^%	1015.2 hPa	16.1 ^km	East (80°)	5.6 ^km/h	0 mm		Overcast
7:52 AM	13.9 ^°C	7.8 ^°C	67 ^%	1015.6 hPa	16.1 ^km	Calm		0 mm	Rain	Light Rain
8:52 AM	12.8 ^°C	9.4 ^°C	80 ^%	1015.9 hPa	6.4 ^km	Calm		0.25 mm	Rain	Rain
9:52 AM	11.7 ^°C	8.9 ^°C	83 ^%	1016.6 hPa	8 ^km	NE (40°)	5.6 ^km/h	0.76 mm	Rain	Light Rain
10:21 AM	12 ^°C	10 ^°C	88 ^%	1016.6 hPa	4 ^km	SW (230°)	9.3 ^km/h	0.25 mm	Rain	Rain
10:47 AM	11 ^°C	9 ^°C	88 ^%	1016.6 hPa	4.8 ^km	WNW (300°)	5.6 ^km/h	1.52 mm	Rain	Light Rain
10:50 AM	11 ^°C	9 ^°C	88 ^%	1016.6 hPa	4 ^km	Calm		1.78 mm	Rain	Rain
10:52 AM	11 ^°C	10 ^°C	94 ^%	1016.6 hPa	4 ^km	Calm			Rain	Rain
11:07 AM	11 ^°C	9 ^°C	88 ^%	1016.6 hPa	4 ^km	SSE (150°)	5.6 ^km/h	0.51 mm	Rain	Light Rain
11:25 AM	11 ^°C	10 ^°C	94 ^%	1016.6 hPa	4 ^km	Calm		1.52 mm	Rain	Rain
11:44 AM	11 ^°C	9 ^°C	88 ^%	1016.3 hPa	9.7 ^km	East (80°)	14.8 ^km/h	2.03 mm	Rain	Light Rain
11:52 AM	10.6 ^°C	8.3 ^°C	86 ^%	1016.3 hPa	9.7 ^km	East (80°)	16.7 ^km/h	2.03 mm	Rain	Light Rain
12:22 PM	11 ^°C	9 ^°C	88 ^%	1015.9 hPa	11.3 ^km	ENE (60°)	13 ^km/h	0 mm	Rain	Light Rain
12:38 PM	11 ^°C	9 ^°C	88 ^%	1015.6 hPa	11.3 ^km	ENE (70°)	16.7 ^km/h	0.25 mm	Rain	Light Rain
12:52 PM	10 ^°C	8.3 ^°C	89 ^%	1015.6 hPa	9.7 ^km	ENE (70°)	16.7 ^km/h	0.51 mm	Rain	Light Rain
1:28 PM	11 ^°C	9 ^°C	88 ^%	1014.9 hPa	11.3 ^km	East (90°)	13 ^km/h	1.02 mm	Rain	Light Rain
1:52 PM	10.6 ^°C	8.9 ^°C	89 ^%	1014.9 hPa	12.9 ^km	East (80°)	13 ^km/h	1.27 mm		Overcast
2:52 PM	10.6 ^°C	8.9 ^°C	89 ^%	1014.6 hPa	16.1 ^km	East (80°)	11.1 ^km/h	0 mm		Overcast
3:52 PM	11.1 ^°C	8.9 ^°C	86 ^%	1013.9 hPa	16.1 ^km	East (80°)	5.6 ^km/h			Overcast
4:52 PM	11.1 ^°C	8.9 ^°C	86 ^%	1013.5 hPa	16.1 ^km	East (90°)	5.6 ^km/h			Overcast
5:52 PM	11.7 ^°C	9.4 ^°C	86 ^%	1013.2 hPa	16.1 ^km	ENE (60°)	7.4 ^km/h			Overcast
6:13 PM	11 ^°C	9 ^°C	88 ^%	1013.5 hPa	16.1 ^km	NE (50°)	7.4 ^km/h			Overcast
6:52 PM	11.1 ^°C	9.4 ^°C	89 ^%	1013.9 hPa	16.1 ^km	East (90°)	5.6 ^km/h			Overcast
7:52 PM	11.1 ^°C	9.4 ^°C	89 ^%	1014.2 hPa	16.1 ^km	Calm				Overcast
8:52 PM	11.1 ^°C	9.4 ^°C	89 ^%	1014.2 hPa	16.1 ^km	Calm				Mostly Cloudy
9:52 PM	11.7 ^°C	8.9 ^°C	83 ^%	1014.6 hPa	16.1 ^km	NW (320°)	9.3 ^km/h			Mostly Cloudy
10:52 PM	11.1 ^°C	9.4 ^°C	89 ^%	1014.9 hPa	16.1 ^km	WNW (290°)	5.6 ^km/h			Mostly Cloudy
11:52 PM	10.6 ^°C	9.4 ^°C	92 ^%	1014.9 hPa	16.1 ^km	WNW (300°)	13 ^km/h			Scattered Clouds

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