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 26.4°F (-3.1°C).Humidity
In Great Falls, the average relative humidity in January is 73%.Rainfall
The month with the least rainfall in Great Falls 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 in Great Falls, Virginia. January is the month with the most snowfall. Snow falls for 4.6 days and accumulates 2.28" (58mm) of snow.Daylight
In January, the average length of the day in Great Falls is 9h and 48min.On the first day of January in Great Falls, sunrise is at 7:27 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
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: In January, a regular UV index of 2 translates into these guidelines:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Frequently asked questions
What month is the coldest in Great Falls?
How cold is it in Great Falls in January?
What is the average humidity in January in Great Falls?
What is the driest month in Great Falls?
How many days does it rain in January in Great Falls?
What is the snowiest month in Great Falls?
How many days does it snow in January in Great Falls?
How many hours of daylight does Great Falls have in January?
When is the sunrise / sunset in January in Great Falls?
What are the months with the least sunshine in Great Falls?
How long on average sun shines in January in Great Falls?
What is the month with the lowest UV index in Great Falls?
How high is the UV index in January in Great Falls?
Average temperature in January
Great Falls, 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
Great Falls, 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
Great Falls, 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
Great Falls, 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
Great Falls, 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
Great Falls, 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
Great Falls, 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
Great Falls, 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
Great Falls, 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
Great Falls, 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
Great Falls, 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
Great Falls, 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
Great Falls, 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).
Great Falls, Virginia, USA
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