HERNDON, VIRGINIA

Home > North America > United States > Virginia
Elevation: 98 meters Latitude: 38 57N Longitude: 077 27W

WEATHER

Monthly - Summary

Hourly Data

SELECT A DAY

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

PRINT THIS DATA

[ ← Previous Day ]
WEATHER ALMANAC - 31 AUGUST, 2015

[ Next Day → ]

[ °F ] °C

Weather Element	Average	High	Low
Temperature	25.5 ^°C	30.6 ^°C (5:52 pm)	21.1 ^°C (6:52 am)
Dewpoint	18.7 ^°C	20 ^°C (9:52 am)	16.7 ^°C (11:52 am)
Humidity	67.4 ^%	87 ^% (6:52 am)	48 ^% (5:52 pm)
Barometer	1018.3 ^hPa	1019.6 hPa (10:52 am)	1016.9 hPa (4:52 pm)
Wind Speed	6.1 ^km/h	11.1 ^km/h (9:52 am)

Weather Element	Average
Visibility	16.1 ^km
Wind Direction	SSE (142.9 °)

Weather Element	Total
Precipitation	0.25 ^mm
Cooling Degree Days	7.6 (Base 18.3)
Growing Degree Days	15.9 (Base 10)

Averaged from 24 records on 31 August, 2015

WEATHER CONDITIONS BREAKOUT

WIND DIRECTION BREAKOUT

WEATHER BY HOUR - 31 AUGUST, 2015

[ °F ] °C

Local Time	Temperature	Dewpoint	Humidity	Barometer	Visibility	Wind Direction	Wind Speed	Precipitation	Events	Conditions
12:52 AM	23.9 ^°C	18.9 ^°C	73 ^%	1018.6 hPa	16.1 ^km	SSW (200°)	9.3 ^km/h			Overcast
1:52 AM	23.3 ^°C	18.9 ^°C	76 ^%	1018.6 hPa	16.1 ^km	South (190°)	5.6 ^km/h			Overcast
2:52 AM	23.3 ^°C	18.9 ^°C	76 ^%	1017.9 hPa	16.1 ^km	Calm				Overcast
3:52 AM	22.8 ^°C	18.9 ^°C	79 ^%	1017.9 hPa	16.1 ^km	South (180°)	5.6 ^km/h			Overcast
4:52 AM	22.8 ^°C	18.9 ^°C	79 ^%	1017.9 hPa	16.1 ^km	SSW (200°)	7.4 ^km/h			Overcast
5:52 AM	22.8 ^°C	18.9 ^°C	79 ^%	1017.9 hPa	16.1 ^km	Calm				Overcast
6:52 AM	21.1 ^°C	18.9 ^°C	87 ^%	1018.6 hPa	16.1 ^km	Calm				Overcast
7:52 AM	22.8 ^°C	19.4 ^°C	81 ^%	1019 hPa	16.1 ^km	South (190°)	9.3 ^km/h	0 mm	Rain	Light Rain
8:52 AM	23.3 ^°C	19.4 ^°C	79 ^%	1019 hPa	16.1 ^km	Calm		0.25 mm		Mostly Cloudy
9:52 AM	25.6 ^°C	20 ^°C	71 ^%	1019.3 hPa	16.1 ^km	NW (310°)	11.1 ^km/h	0 mm		Overcast
10:52 AM	26.1 ^°C	19.4 ^°C	66 ^%	1019.6 hPa	16.1 ^km	South (170°)	5.6 ^km/h			Overcast
11:52 AM	27.8 ^°C	16.7 ^°C	51 ^%	1019.3 hPa	16.1 ^km	Variable	5.6 ^km/h			Overcast
12:52 PM	28.3 ^°C	17.2 ^°C	51 ^%	1019 hPa	16.1 ^km	WSW (250°)	7.4 ^km/h			Mostly Cloudy
1:52 PM	28.3 ^°C	18.3 ^°C	54 ^%	1018.3 hPa	16.1 ^km	SSW (210°)	11.1 ^km/h			Mostly Cloudy
2:52 PM	28.3 ^°C	18.9 ^°C	56 ^%	1017.9 hPa	16.1 ^km	SW (220°)	11.1 ^km/h			Mostly Cloudy
3:52 PM	30 ^°C	18.9 ^°C	51 ^%	1017.6 hPa	16.1 ^km	Calm				Mostly Cloudy
4:52 PM	30 ^°C	18.3 ^°C	49 ^%	1016.9 hPa	16.1 ^km	Calm				Mostly Cloudy
5:52 PM	30.6 ^°C	18.3 ^°C	48 ^%	1016.9 hPa	16.1 ^km	SSW (210°)	11.1 ^km/h			Scattered Clouds
6:52 PM	28.9 ^°C	18.3 ^°C	53 ^%	1016.9 hPa	16.1 ^km	South (180°)	9.3 ^km/h			Clear
7:52 PM	26.7 ^°C	18.3 ^°C	60 ^%	1016.9 hPa	16.1 ^km	South (180°)	7.4 ^km/h			Scattered Clouds
8:52 PM	25.6 ^°C	18.9 ^°C	66 ^%	1017.3 hPa	16.1 ^km	South (170°)	7.4 ^km/h			Mostly Cloudy
9:52 PM	23.9 ^°C	18.9 ^°C	73 ^%	1017.6 hPa	16.1 ^km	South (190°)	7.4 ^km/h			Partly Cloudy
10:52 PM	22.8 ^°C	18.9 ^°C	79 ^%	1017.9 hPa	16.1 ^km	South (190°)	5.6 ^km/h			Partly Cloudy
11:52 PM	22.8 ^°C	19.4 ^°C	81 ^%	1017.9 hPa	16.1 ^km	South (190°)	9.3 ^km/h			Clear

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