January weather forecastManassas, VA
January
Weather in January
Entering the year with January, Manassas weather grapples with notable cold temperatures. The daily thermometers indicate a typical swing from 40.6°F (4.8°C) to 26.4°F (-3.1°C). Sunlight remains scarce with significantly short days and a cloud cover that seems to persistently hang over the city. While some light snowfall often graces the city, rainfall remains a more common occurrence. On the few clear days, locals take advantage of the break from overcast weather, bundling up to brave the wintry chill.Temperature
January is the coldest month, with the temperature often reaching an average high of 40.6°F (4.8°C) and an average low of 26.4°F (-3.1°C).Humidity
In Manassas, the average relative humidity in January is 74%.Rainfall
In Manassas, in January, during 9.5 rainfall days, 1.97" (50mm) of precipitation is typically accumulated. Throughout the year, there are 157.5 rainfall days, and 30.35" (771mm) of precipitation is accumulated.Snowfall
Months with snowfall in Manassas are January through April, November and December. The month with the most snowfall in Manassas is January, when snow falls for 4.9 days and typically aggregates up to 3.7" (94mm) of snow.Daylight
In January, the average length of the day is 9h and 49min.On the first day of January in Manassas, sunrise is at 7:27 am and sunset at 4:58 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 5:29 pm EST.
Sunshine
The months with the least sunshine are January, February and December, with an average of 5.2h of sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.Note: In January, the maximum UV index of 2 translates into these guidelines:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Manassas, VA
- Average high temperature in January: 40.6°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (40.6°F).
- Average low temperature in January: 26.4°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure in January
Manassas, 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
Manassas, VA
- Average wind speed in January: 6.5mph
The windiest months (with the highest average wind speed) are March and April (7mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity in January
Manassas, VA
- Average humidity in January: 74%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (72%).
Average rainfall in January
Manassas, VA
- Average rainfall in January: 1.97"
The wettest month (with the highest rainfall) is August (3.43").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days in January
Manassas, VA
- Average rainfall days in January: 9.5 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is November (9.3 days).
Average snowfall in January
Manassas, VA
- Average snowfall in January: 3.7"
The month with the highest snowfall is January (3.7").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Manassas, VA
- Average snowfall days in January: 4.9 days
The month with the highest number of snowfall days is February (5.2 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
Manassas, 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 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 12min).
Average sunshine days in January
Manassas, VA
- Average sunshine days in January: 17.8 days
The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is May (11.7 days).
Average UV index in January
Manassas, 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, February, November and December (UV index 2).
Average cloud cover in January
Manassas, VA
- Average cloud cover in January: 44
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in January
Manassas, VA
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, June, July, August and November (6mi).
The months with the lowest visibility are May, September, October and December (5mi).
