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
In Reston, January is the coldest month, with temperatures averaging a high of 39.7°F (4.3°C) and a low of 26.4°F (-3.1°C).Humidity
The average relative humidity in January is 73%.Rainfall
The month with the least rainfall in Reston is January, when the rain falls for 9.4 days and typically collects 1.77" (45mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. January is the month with the most snowfall. Snow falls for 4.6 days and accumulates 2.28" (58mm) of snow.Daylight
The average length of the day in January is 9h and 48min.On the first day of January, sunrise is at 7:28 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 5:28 pm EST.
Sunshine
January, February and December, with an average of 5h 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 value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 2 during January translates into the following directions:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. It's recommended to limit sun exposure when its radiation is at its peak during midday. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Frequently asked questions
What are the coldest months in Reston?
Is it cold in Reston during January?
What is the average humidity in January in Reston?
What is the driest month in Reston?
How many days does it rain in January in Reston?
What is the snowiest month in Reston?
How much does it snow in Reston in January?
How many hours of daylight does Reston have in January?
What time are sunrise and sunset in January in Reston?
What is the month with the least sunshine in Reston?
How many hours of sunshine does Reston have in January?
What are the months with the lowest UV index in Reston?
What is the UV index reading in January in Reston?
Average temperature in January
Reston, VA
- Average high temperature in January: 39.7°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 (39.7°F).
- Average low temperature in January: 26.4°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure in January
Reston, 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
Reston, 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
Reston, VA
- Average humidity in January: 73%
The months with the highest relative humidity are October and December (76%).
The month with the lowest relative humidity is July (69%).
Average rainfall in January
Reston, VA
- Average rainfall in January: 1.77"
The wettest month (with the highest rainfall) is August (3.39").
The driest month (with the least rainfall) is January (1.77").
Average rainfall days in January
Reston, VA
- Average rainfall days in January: 9.4 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is November (9.3 days).
Average snowfall in January
Reston, VA
- Average snowfall in January: 2.28"
The month with the highest snowfall is January (2.28").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Reston, VA
- Average snowfall days in January: 4.6 days
The month with the highest number of snowfall days is January (4.6 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
Reston, 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 0min
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 0min).
Average sunshine days in January
Reston, VA
- Average sunshine days in January: 17.8 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (12.8 days).
Average UV index in January
Reston, 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
Reston, 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
Reston, 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).
Reston, Virginia, USA
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