Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December indicates a minor shift in the average high-temperature, from November's cool 53.4°F (11.9°C) to a chilly 45.3°F (7.4°C). An average low-temperature of 32.7°F (0.4°C) is observed during December nights in Great Falls.Humidity
October and December, with an average relative humidity of 76%, are the most humid months.Rainfall
In December, in Great Falls, the rain falls for 9.8 days. Throughout December, 2.17" (55mm) of precipitation is accumulated. Throughout the year, in Great Falls, there are 152.8 rainfall days, and 27.64" (702mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Great Falls, during December, snow falls for 2.2 days and regularly aggregates up to 1.22" (31mm) of snow. In Great Falls, during the entire year, snow falls for 13.9 days and aggregates up to 7.2" (183mm) of snow.Daylight
The month with the shortest days in Great Falls, Virginia, is December, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:09 am and sunset at 4:47 pm. On the last day of December, in Great Falls, sunrise is at 7:27 am and sunset at 4:57 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 value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: The average daily UV index of 2 in December transforms into the following instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
What are the temperatures in Great Falls in December?
What is the most humid month in Great Falls?
What is the average humidity in December in Great Falls?
How much does it rain in Great Falls in December?
How many days does it snow in December in Great Falls?
What is the month with the shortest days in Great Falls?
How many hours of daylight does Great Falls have in December?
When are sunrise and sunset in December in Great Falls?
What are the months with the least sunshine in Great Falls?
How long on average sun shines in December in Great Falls?
What are the months with the lowest UV index in Great Falls?
How high is the UV index in December in Great Falls?
Average temperature in December
Great Falls, VA
- Average high temperature in December: 45.3°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 December: 32.7°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 December
Great Falls, VA
- Average pressure in December: 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 December
Great Falls, VA
- Average wind speed in December: 6.8mph
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 December
Great Falls, VA
- Average humidity in December: 76%
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 December
Great Falls, VA
- Average rainfall in December: 2.17"
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 December
Great Falls, VA
- Average rainfall days in December: 9.8 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 December
Great Falls, VA
- Average snowfall in December: 1.22"
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 December
Great Falls, VA
- Average snowfall days in December: 2.2 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 December /
Average sunshine in December
Great Falls, VA
- Average daylight in December: 9h and 3min
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 December: 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 December
Great Falls, VA
- Average sunshine days in December: 17.9 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 December
Great Falls, VA
- Average UV index in December: 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 December
Great Falls, VA
- Average cloud cover in December: 46
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 December
Great Falls, VA
- Average visibility in December: 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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