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 - 1 SEPTEMBER, 2015

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[ °F ] °C

Weather Element	Average	High	Low
Temperature	24.8 ^°C	33.3 ^°C (12:52 pm)	18 ^°C (7:09 am)
Dewpoint	19.1 ^°C	20 ^°C (12:52 am)	17.2 ^°C (4:52 pm)
Humidity	74.3 ^%	100 ^% (4:30 am)	39 ^% (3:52 pm)
Barometer	1017.6 ^hPa	1019 hPa (10:52 am)	1015.9 hPa (5:52 pm)
Wind Speed	5.5 ^km/h	14.8 ^km/h (11:52 am)

Weather Element	Average
Visibility	14.2 ^km
Wind Direction	ESE (129.3 °)

Weather Element	Total
Precipitation	---
Cooling Degree Days	7.3 (Base 18.3)
Growing Degree Days	15.7 (Base 10)

Averaged from 30 records on 1 September, 2015

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WIND DIRECTION BREAKOUT

WEATHER BY HOUR - 1 SEPTEMBER, 2015

[ °F ] °C

Local Time	Temperature	Dewpoint	Humidity	Barometer	Visibility	Wind Direction	Wind Speed	Events	Conditions
12:52 AM	22.2 ^°C	20 ^°C	87 ^%	1017.9 hPa	16.1 ^km	SSW (200°)	9.3 ^km/h		Clear
1:52 AM	21.7 ^°C	20 ^°C	90 ^%	1017.6 hPa	16.1 ^km	South (190°)	11.1 ^km/h		Clear
2:52 AM	21.1 ^°C	20 ^°C	93 ^%	1017.3 hPa	16.1 ^km	South (180°)	7.4 ^km/h		Clear
3:52 AM	20.6 ^°C	19.4 ^°C	93 ^%	1017.3 hPa	16.1 ^km	Calm			Clear
4:30 AM	19 ^°C	19 ^°C	100 ^%	1017.6 hPa	2.4 ^km	Calm			Clear
4:32 AM	19 ^°C	19 ^°C	100 ^%	1017.6 hPa	1.3 ^km	Calm			Clear
4:36 AM	19 ^°C	19 ^°C	100 ^%	1017.6 hPa	16.1 ^km	Calm			Clear
4:52 AM	19.4 ^°C	18.9 ^°C	97 ^%	1017.3 hPa	16.1 ^km	Calm			Clear
5:52 AM	18.9 ^°C	18.3 ^°C	96 ^%	1017.3 hPa	16.1 ^km	Calm			Clear
6:27 AM	19 ^°C	19 ^°C	100 ^%	1017.6 hPa	9.7 ^km	Calm		Fog	Patches of Fog
6:32 AM	19 ^°C	19 ^°C	100 ^%	1017.9 hPa	8 ^km	Calm		Fog	Shallow Fog
6:52 AM	18.3 ^°C	18.3 ^°C	100 ^%	1017.9 hPa	8 ^km	Calm			Clear
7:09 AM	18 ^°C	18 ^°C	100 ^%	1018.3 hPa	14.5 ^km	Calm			Clear
7:52 AM	21.7 ^°C	20 ^°C	90 ^%	1018.3 hPa	16.1 ^km	NW (310°)	5.6 ^km/h		Clear
8:52 AM	25 ^°C	19.4 ^°C	71 ^%	1018.6 hPa	16.1 ^km	NNW (330°)	9.3 ^km/h		Clear
9:52 AM	27.2 ^°C	19.4 ^°C	62 ^%	1018.6 hPa	16.1 ^km	NW (320°)	11.1 ^km/h		Partly Cloudy
10:52 AM	30 ^°C	19.4 ^°C	53 ^%	1019 hPa	16.1 ^km	North (350°)	13 ^km/h		Partly Cloudy
11:52 AM	31.1 ^°C	19.4 ^°C	49 ^%	1018.6 hPa	16.1 ^km	North (350°)	14.8 ^km/h		Partly Cloudy
12:52 PM	33.3 ^°C	19.4 ^°C	44 ^%	1017.9 hPa	16.1 ^km	NNW (330°)	9.3 ^km/h		Scattered Clouds
1:52 PM	31.7 ^°C	18.9 ^°C	46 ^%	1017.9 hPa	16.1 ^km	NNW (330°)	14.8 ^km/h		Scattered Clouds
2:52 PM	32.8 ^°C	18.9 ^°C	44 ^%	1017.3 hPa	16.1 ^km	NW (320°)	14.8 ^km/h		Scattered Clouds
3:52 PM	33.3 ^°C	17.8 ^°C	39 ^%	1016.6 hPa	16.1 ^km	Variable	9.3 ^km/h		Mostly Cloudy
4:52 PM	32.8 ^°C	17.2 ^°C	39 ^%	1016.3 hPa	16.1 ^km	WNW (300°)	11.1 ^km/h		Mostly Cloudy
5:52 PM	32.2 ^°C	17.8 ^°C	42 ^%	1015.9 hPa	16.1 ^km	Variable	5.6 ^km/h		Mostly Cloudy
6:52 PM	31.1 ^°C	18.3 ^°C	46 ^%	1016.3 hPa	16.1 ^km	NW (320°)	9.3 ^km/h		Mostly Cloudy
7:52 PM	28.3 ^°C	18.9 ^°C	56 ^%	1016.3 hPa	14.5 ^km	Calm			Mostly Cloudy
8:52 PM	25.6 ^°C	19.4 ^°C	68 ^%	1017.3 hPa	14.5 ^km	Calm			Mostly Cloudy
9:52 PM	24.4 ^°C	19.4 ^°C	74 ^%	1017.3 hPa	14.5 ^km	Calm			Scattered Clouds
10:52 PM	26.7 ^°C	20 ^°C	67 ^%	1017.6 hPa	16.1 ^km	NE (50°)	5.6 ^km/h		Mostly Cloudy
11:52 PM	23.3 ^°C	20 ^°C	82 ^%	1017.6 hPa	14.5 ^km	Calm			Mostly Cloudy

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