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
During the shift to December, a minor reduction in average high-temperature is observed, shifting from a mild 56.7°F (13.7°C) in November to a frosty 49.1°F (9.5°C). In Roslyn Hills, the average temperature during the nights of December drops to an icy 34.9°F (1.6°C).Humidity
December is the most humid month in Roslyn Hills, with an average relative humidity of 78%.Rainfall
In Roslyn Hills, Virginia, in December, during 10.1 rainfall days, 1.93" (49mm) of precipitation is typically accumulated. Throughout the year, in Roslyn Hills, there are 151.1 rainfall days, and 26.22" (666mm) of precipitation is accumulated.Snowfall
Months with snowfall in Roslyn Hills are January through April, November and December. In Roslyn Hills, during December, snow falls for 1.5 days and regularly aggregates up to 1.5" (38mm) of snow. In Roslyn Hills, during the entire year, snow falls for 10.5 days and aggregates up to 6.42" (163mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 36min of daylight.On the first day of December, sunrise is at 7:06 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:02 pm EST.
Sunshine
The month with the least sunshine is December, with an average of 5.2h of sunshine.UV index
The months with the lowest UV index in Roslyn Hills, Virginia, are January, February and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: An average UV index of 2 in December transforms into this advice:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Frequently asked questions
What is the temperature in December in Roslyn Hills?
What is the most humid month in Roslyn Hills?
What is the average humidity in December in Roslyn Hills?
How much does it rain in Roslyn Hills in December?
How much does it snow in Roslyn Hills in December?
What is the month with the shortest days in Roslyn Hills?
What is the average length of the day in December in Roslyn Hills?
What time are sunrise and sunset in December in Roslyn Hills?
What is the month with the least sunshine in Roslyn Hills?
How long on average sun shines in December in Roslyn Hills?
When is the lowest UV index in Roslyn Hills?
What is the UV index intensity in December in Roslyn Hills?
Average temperature in December
Roslyn Hills, VA
- Average high temperature in December: 49.1°F
The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (44.2°F).
- Average low temperature in December: 34.9°F
The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (29.5°F).
Average pressure in December
Roslyn Hills, VA
- Average pressure in December: 30.12"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
Roslyn Hills, VA
- Average wind speed in December: 6mph
The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Roslyn Hills, VA
- Average humidity in December: 78%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (68%).
Average rainfall in December
Roslyn Hills, VA
- Average rainfall in December: 1.93"
The wettest month (with the highest rainfall) is August (2.72").
The driest month (with the least rainfall) is September (1.65").
Average rainfall days in December
Roslyn Hills, VA
- Average rainfall days in December: 10.1 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is November (8.8 days).
Average snowfall in December
Roslyn Hills, VA
- Average snowfall in December: 1.5"
The month with the highest snowfall is February (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Roslyn Hills, VA
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is February (3.5 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
Roslyn Hills, VA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in December
Roslyn Hills, VA
- Average sunshine days in December: 19.2 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (11.9 days).
Average UV index in December
Roslyn Hills, VA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in December
Roslyn Hills, VA
- Average cloud cover in December: 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 December
Roslyn Hills, 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).
Roslyn Hills, Virginia, USA
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