Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
The coldest time of the year is January, with temperatures averaging a high of 39.7°F (4.3°C) and a low of 25.7°F (-3.5°C).Humidity
In Chantilly, the average relative humidity in January is 74%.Rainfall
In Chantilly, in January, during 9.5 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. Throughout the year, there are 156 rainfall days, and 31.18" (792mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. The month with the most snowfall is January, when snow falls for 5.2 days and typically aggregates up to 3.58" (91mm) of snow.Daylight
In Chantilly, the average length of the day in January is 9h and 49min.On the first day of the month, sunrise is at 7:28 am and sunset at 4:58 pm. On the last day of January, sunrise is at 7:16 am and sunset at 5:29 pm EST.
Sunshine
January, February and December, with an average of 5.1h of sunshine, are months with the least 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 reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.Note: The daily maximum UV index of 2 in January interprets into the following advice:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. 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. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
How cold is it in January?
What is the average humidity in January?
How much does it rain in January?
When does it snow the most in Chantilly?
How much does it snow in January?
How many hours of daylight does Chantilly have in January?
What time are sunrise and sunset in January?
What is the month with the least sunshine?
How many hours of sunshine does Chantilly have in January?
What are the months with the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Chantilly, VA
- Average high temperature in January: 39.7°F
The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (39.7°F).
- Average low temperature in January: 25.7°F
The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in January
Chantilly, 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
Chantilly, VA
- Average wind speed in January: 7.1mph
The windiest months (with the highest average wind speed) are March and April (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in January
Chantilly, VA
- Average humidity in January: 74%
The months with the highest relative humidity are October and December (77%).
The month with the lowest relative humidity is July (71%).
Average rainfall in January
Chantilly, VA
- Average rainfall in January: 2.09"
The wettest month (with the highest rainfall) is August (3.74").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in January
Chantilly, VA
- Average rainfall days in January: 9.5 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is November (9.3 days).
Average snowfall in January
Chantilly, VA
- Average snowfall in January: 3.58"
The month with the highest snowfall is January (3.58").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Chantilly, VA
- Average snowfall days in January: 5.2 days
The month with the highest number of snowfall days is February (5.3 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
Chantilly, VA
- Average daylight in January: 9h and 5min
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 1min
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 6min).
Average sunshine days in January
Chantilly, VA
- Average sunshine days in January: 17.2 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (12.1 days).
Average UV index in January
Chantilly, 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
Chantilly, VA
- Average cloud cover in January: 45
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
Chantilly, VA
- Average visibility in January: 5mi
The months with the highest visibility are February, March, April, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and May (5mi).
Chantilly, Virginia, USA
Weather forecast for your location
2. Allow the app to use your location