January weather forecastAnnandale, VA
January
Weather in January
January, the same as December, is another cold winter month in Annandale, Virginia, with an average temperature ranging between min 27.1°F (-2.7°C) and max 40.5°F (4.7°C).Temperature
January, on average, is the coldest month, registering a high temperature of 40.5°F (4.7°C) and a low of 27.1°F (-2.7°C).Humidity
In Annandale, the average relative humidity in January is 72%.Rainfall
The month with the least rainfall in Annandale is January, when the rain falls for 9.8 days and typically collects 2.05" (52mm) of precipitation.Snowfall
Months with snowfall in Annandale are January through April, November and December. The month with the most snowfall is January, when snow falls for 4.9 days and typically aggregates up to 3.31" (84mm) of snow.Daylight
The average length of the day in January in Annandale, Virginia, 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
January, February and December, with an average of 5.2h of sunshine, are months with the least sunshine in Annandale, Virginia.UV index
The months with the lowest UV index in Annandale are January, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: During January, 2 as the daily maximum UV index converts into the following advice:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Annandale, VA
- Average high temperature in January: 40.5°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (40.5°F).
- Average low temperature in January: 27.1°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 (27.1°F).
Average pressure in January
Annandale, 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
Annandale, VA
- Average wind speed in January: 7.2mph
The windiest month (with the highest average wind speed) is March (7.6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in January
Annandale, VA
- Average humidity in January: 72%
The month with the highest relative humidity is October (77%).
The months with the lowest relative humidity are April and July (71%).
Average rainfall in January
Annandale, VA
- Average rainfall in January: 2.05"
The wettest month (with the highest rainfall) is August (3.78").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in January
Annandale, VA
- Average rainfall days in January: 9.8 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is November (8.9 days).
Average snowfall in January
Annandale, VA
- Average snowfall in January: 3.31"
The month with the highest snowfall is January (3.31").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Annandale, VA
- Average snowfall days in January: 4.9 days
The month with the highest number of snowfall days is January (4.9 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
Annandale, VA
- Average daylight in January: 9h and 48min
The month with the longest days is June (Average daylight: 14h and 48min).
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 January, February and December (Average sunshine: 5h and 12min).
Average sunshine days in January
Annandale, VA
- Average sunshine days in January: 17.9 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in January
Annandale, 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
Annandale, VA
- Average cloud cover in January: 43
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
Annandale, 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).
