October weather forecastMcLean, VA
October
Weather in October
October, the same as September, is another enjoyable autumn month in McLean, Virginia, with an average temperature varying between 50.7°F (10.4°C) and 66.4°F (19.1°C).Temperature
McLean's progression into October includes a drop in the average high-temperature, from a moderately hot 78.6°F (25.9°C) in September to a refreshing 66.4°F (19.1°C). During the month of October, McLean anticipates a mean low-temperature of 50.7°F (10.4°C).Humidity
October and December, with an average relative humidity of 76%, are the most humid months.Rainfall
In McLean, in October, it is raining for 7.5 days, with typically 0.67" (17mm) of accumulated precipitation. Throughout the year, there are 109 rainfall days, and 9.29" (236mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In October, the average length of the day is 11h and 10min.On the first day of the month, sunrise is at 7:05 am and sunset at 6:50 pm. On the last day of October, sunrise is at 7:35 am and sunset at 6:08 pm EDT.
Sunshine
In McLean, the average sunshine in October is 5.7h.UV index
The average daily maximum UV index in October is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 4 during October leads to these advisories:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in October
McLean, VA
- Average high temperature in October: 66.4°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (40.1°F).
- Average low temperature in October: 50.7°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).
Average pressure in October
McLean, VA
- Average pressure in October: 30.04"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in October
McLean, VA
- Average wind speed in October: 6.5mph
The windiest month (with the highest average wind speed) is March (7.7mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in October
McLean, VA
- Average humidity in October: 76%
The months with the highest relative humidity are October and December (76%).
The month with the lowest relative humidity is July (70%).
Average rainfall in October
McLean, VA
- Average rainfall in October: 0.67"
The wettest month (with the highest rainfall) is August (1.5").
The driest months (with the least rainfall) are January and September (0.51").
Average rainfall days in October
McLean, VA
- Average rainfall days in October: 7.5 days
The month with the highest number of rainy days is July (13.5 days).
The month with the least rainy days is November (5.6 days).
Average snowfall in October
McLean, VA
- Average snowfall in October: 0"
The month with the highest snowfall is January (0.98").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in October
McLean, VA
- Average snowfall days in October: 0 days
The month with the highest number of snowfall days is February (3.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in October /
Average sunshine in October
McLean, VA
- Average daylight in October: 11h and 12min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in October: 5h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are February and December (Average sunshine: 5h and 6min).
Average sunshine days in October
McLean, VA
- Average sunshine days in October: 21.4 days
The month with the most sunshine days is November (23 days).
The month with the least sunshine days is July (14.3 days).
Average UV index in October
McLean, VA
- Average UV index in October: 4
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, November and December (UV index 2).
Average cloud cover in October
McLean, VA
- Average cloud cover in October: 39
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in October
McLean, VA
- Average visibility in October: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
