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 - 18 DECEMBER, 2014

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[ °F ] °C

Weather Element	Average	High	Low
Temperature	1.2 ^°C	3.3 ^°C (1:52 pm)	0 ^°C (5:52 am)
Dewpoint	-6.2 ^°C	-5 ^°C (10:52 pm)	-7.2 ^°C (4:52 am)
Humidity	58.6 ^%	69 ^% (10:52 pm)	51 ^% (1:52 pm)
Barometer	1020.3 ^hPa	1022.7 hPa (9:52 am)	1019 hPa (12:52 am)
Wind Speed	19.5 ^km/h	29.6 ^km/h (12:52 am)
Wind Gust		40.7 ^km/h (12:52 am)

Weather Element	Average
Visibility	16.1 ^km
Wind Direction	WNW (303.3 °)

Weather Element	Total
Precipitation	---
Heating Degree Days	16.7 (Base 18.3)

Averaged from 24 records on 18 December, 2014

WEATHER CONDITIONS BREAKOUT

WIND DIRECTION BREAKOUT

WEATHER BY HOUR - 18 DECEMBER, 2014

[ °F ] °C

Local Time	Temperature	Dewpoint	Humidity	Barometer	Visibility	Wind Direction	Wind Speed	Gust Speed	Conditions
12:52 AM	2.2 ^°C	-6.1 ^°C	55 ^%	1019 hPa	16.1 ^km	NW (310°)	29.6 ^km/h	40.7 ^km/h	Mostly Cloudy
1:52 AM	1.7 ^°C	-5.6 ^°C	59 ^%	1019 hPa	16.1 ^km	WNW (290°)	25.9 ^km/h		Mostly Cloudy
2:52 AM	1.7 ^°C	-5.6 ^°C	59 ^%	1019.6 hPa	16.1 ^km	WNW (300°)	22.2 ^km/h		Mostly Cloudy
3:52 AM	1.7 ^°C	-6.1 ^°C	57 ^%	1020 hPa	16.1 ^km	NW (310°)	7.4 ^km/h		Mostly Cloudy
4:52 AM	0.6 ^°C	-7.2 ^°C	56 ^%	1019.3 hPa	16.1 ^km	NW (310°)	29.6 ^km/h	38.9 ^km/h	Scattered Clouds
5:52 AM	0 ^°C	-7.2 ^°C	59 ^%	1020.7 hPa	16.1 ^km	WNW (300°)	24.1 ^km/h		Partly Cloudy
6:52 AM	0 ^°C	-7 ^°C	60 ^%	1021 hPa	16.1 ^km	NNW (330°)	14.8 ^km/h		Partly Cloudy
7:52 AM	0 ^°C	-7.2 ^°C	59 ^%	1021.7 hPa	16.1 ^km	NW (320°)	14.8 ^km/h		Scattered Clouds
8:52 AM	0.6 ^°C	-7.2 ^°C	56 ^%	1021.7 hPa	16.1 ^km	NW (310°)	24.1 ^km/h	38.9 ^km/h	Scattered Clouds
9:52 AM	1.1 ^°C	-7.2 ^°C	54 ^%	1022.7 hPa	16.1 ^km	WNW (290°)	29.6 ^km/h	35.2 ^km/h	Mostly Cloudy
10:52 AM	1.7 ^°C	-6.7 ^°C	54 ^%	1022.4 hPa	16.1 ^km	WNW (300°)	20.4 ^km/h		Mostly Cloudy
11:52 AM	2.2 ^°C	-6.1 ^°C	55 ^%	1021.7 hPa	16.1 ^km	WNW (290°)	27.8 ^km/h		Mostly Cloudy
12:52 PM	2.2 ^°C	-6.1 ^°C	55 ^%	1020.3 hPa	16.1 ^km	NNW (330°)	25.9 ^km/h	35.2 ^km/h	Overcast
1:52 PM	3.3 ^°C	-6.1 ^°C	51 ^%	1019.6 hPa	16.1 ^km	NW (320°)	25.9 ^km/h		Mostly Cloudy
2:52 PM	2.8 ^°C	-6.1 ^°C	52 ^%	1019.3 hPa	16.1 ^km	NW (310°)	24.1 ^km/h	38.9 ^km/h	Mostly Cloudy
3:52 PM	1.7 ^°C	-5.6 ^°C	59 ^%	1019.6 hPa	16.1 ^km	WNW (300°)	20.4 ^km/h		Mostly Cloudy
4:52 PM	1.7 ^°C	-6.1 ^°C	57 ^%	1019.6 hPa	16.1 ^km	NW (310°)	13 ^km/h		Mostly Cloudy
5:52 PM	1.1 ^°C	-5.6 ^°C	61 ^%	1020 hPa	16.1 ^km	WNW (290°)	16.7 ^km/h		Mostly Cloudy
6:52 PM	1.1 ^°C	-5.6 ^°C	61 ^%	1020.7 hPa	16.1 ^km	WNW (300°)	14.8 ^km/h		Mostly Cloudy
7:52 PM	0.6 ^°C	-5.6 ^°C	64 ^%	1020.7 hPa	16.1 ^km	WNW (290°)	13 ^km/h		Mostly Cloudy
8:52 PM	1.1 ^°C	-5.6 ^°C	61 ^%	1020.3 hPa	16.1 ^km	West (280°)	11.1 ^km/h		Mostly Cloudy
9:52 PM	0.6 ^°C	-5.6 ^°C	64 ^%	1020 hPa	16.1 ^km	WNW (300°)	9.3 ^km/h		Mostly Cloudy
10:52 PM	0 ^°C	-5 ^°C	69 ^%	1020.3 hPa	16.1 ^km	WNW (300°)	13 ^km/h		Mostly Cloudy
11:52 PM	0 ^°C	-5 ^°C	69 ^%	1020 hPa	16.1 ^km	WNW (290°)	9.3 ^km/h		Mostly Cloudy

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