January weather forecastWest McLean, VA
January
Weather in January
January, like December, in West McLean, Virginia, is an icy winter month, with an average temperature varying between 26.8°F (-2.9°C) and 40.1°F (4.5°C).Temperature
January is the month when West McLean experiences its coldest temperatures, averaging a high of 40.1°F (4.5°C) and a low of 26.8°F (-2.9°C).Humidity
In January, the average relative humidity in West McLean is 72%.Rainfall
January and September are months with the least rain when the rain falls for 6 days and typically aggregates up to 0.51" (13mm) of rain.Snowfall
January through April, November and December are months with snowfall. The month with the most snowfall is January, when snow falls for 2.7 days and typically aggregates up to 0.98" (25mm) of snow.Daylight
The average length of the day in January is 9h and 49min.On the first day of the month, sunrise is at 7:27 am and sunset at 4:57 pm. On the last day of January, sunrise is at 7:15 am and sunset at 5:28 pm EST.
Sunshine
In West McLean, the average sunshine in January is 5.2h.UV index
The months with the lowest UV index are January, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 2 during January leads to these instructions:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
West McLean, VA
- Average high temperature in January: 40.1°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 January: 26.8°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 January
West McLean, VA
- Average pressure in January: 30.11"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 January
West McLean, VA
- Average wind speed in January: 7.4mph
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 January
West McLean, VA
- Average humidity in January: 72%
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 January
West McLean, VA
- Average rainfall in January: 0.51"
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 January
West McLean, VA
- Average rainfall days in January: 6 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 January
West McLean, VA
- Average snowfall in January: 0.98"
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 January
West McLean, VA
- Average snowfall days in January: 2.7 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 January /
Average sunshine in January
West McLean, VA
- Average daylight in January: 9h and 48min
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 January: 5h and 12min
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 January
West McLean, VA
- Average sunshine days in January: 22.1 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 January
West McLean, VA
- Average UV index in January: 2
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 January
West McLean, VA
- Average cloud cover in January: 44
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 January
West McLean, VA
- Average visibility in January: 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).
