McLean, VA Weather

McLean, VA climate is warm during summer when temperatures tend to be in the 70's and very cold during winter when temperatures tend to be in the 30's.

The warmest month of the year is July with an average maximum temperature of 89.10 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 23.90 degrees Fahrenheit.

Temperature variations between night and day tend to be moderate during summer with a difference that can reach 23 degrees Fahrenheit, and moderate during winter with an average difference of 21 degrees Fahrenheit.

The annual average precipitation at McLean is 45.11 Inches. Rainfall in is fairly evenly distributed throughout the year. The wettest month of the year is May with an average rainfall of 4.42 Inches.

Weather Data

Current Conditions

(Updated: 8:52 AM EST TUE NOV 24 2009)

Fog And Mist, 49°F	Humidity: 90%	Dewpoint: 46°F
	Wind Speed: N 6.9 MPH (6 KT)	Heat Index: 49°F
	Barometer: 30.21 in.	Wind Chill: 46°F

Weather Forecast

(Generated: 7:23 AM EST TUE NOV 24 2009)

	Hi: 51°F	Today: Cloudy. Areas of fog this morning. Occasional rain and drizzle this morning...Then areas of drizzle this afternoon. Highs in the lower 50s. North winds around 5 mph. Chance of rain 80 percent.
	Lo: 45°F
	Hi: 55°F	Wednesday: Cloudy. A chance of showers...Mainly in the afternoon. Highs in the mid 50s. Southeast winds around 5 mph. Chance of rain 40 percent.
	Lo: 41°F
	Hi: 59°F	Thanksgiving day: Mostly cloudy. A chance of showers in the afternoon. Highs in the upper 50s. North winds around 5 mph. Chance of rain 30 percent.
	Lo: 39°F
	Hi: 45°F	Friday: Mostly cloudy with a 40 percent chance of showers. Highs in the mid 40s.
	Lo: 35°F
	Hi: 55°F	Saturday: Mostly sunny. Highs in the mid 50s.
	Lo: 31°F
	Hi: 55°F	Sunday: Sunny. Highs in the mid 50s.
	Lo: 35°F

Moon, Sunrise and Sunset

	Moon Phase: Waxing Gibbous Moon	Civil Twilight: 6:31 AM EST	Sunrise: 7:00 AM EST
		Sunset: 4:50 PM EST	Civil Twilight: 5:19 PM EST

Normal Climate

Normal Temperatures

(DALECARLIA RESERVOIR Weather station, 3.12 miles from McLean)

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
Max °F	44.0	48.4	57.9	68.9	77.6	85.2	89.1	87.4	80.7	69.8	58.6	48.4	68.0
Mean °F	34.0	37.4	45.7	55.6	64.9	73.2	77.6	76.2	69.3	57.3	47.2	38.2	56.4
Min °F	23.9	26.3	33.4	42.3	52.2	61.1	66.1	64.9	57.9	44.7	35.7	28.0	44.7

Normal Precipitation