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
The beginning of December brings a minor change in the average high-temperature, shifting from a cool 53.4°F (11.9°C) in November to a frosty 45.3°F (7.4°C). Throughout the month of December, the average temperature dips to a cold 32.9°F (0.5°C) at night.Humidity
The most humid month is December, with an average relative humidity of 77%.Rainfall
In December, the rain falls for 9.9 days. Throughout December, 2.44" (62mm) of precipitation is accumulated. Throughout the year, there are 156.8 rainfall days, and 30.98" (787mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Twin Brook Forest, in December, snow falls for 3.2 days, with typically accumulated 1.42" (36mm) of snow. Throughout the year, there are 17.7 snowfall days, and 9.92" (252mm) of snow is accumulated.Daylight
December has the shortest days of the year in Twin Brook Forest, 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 4:46 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:56 pm EST.
Sunshine
With an average of 5h of sunshine, December has the least sunshine of the year.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 reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Experience reduced UV exposure by about half when donning a wide-brim hat. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December?
What is the most humid month in Twin Brook Forest?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine in Twin Brook Forest?
How long on average sun shines in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Twin Brook Forest, MD
- Average high temperature in December: 45.3°F
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in December: 32.9°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 (26.2°F).
Average pressure in December
Twin Brook Forest, MD
- 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
Twin Brook Forest, MD
- Average wind speed in December: 7mph
The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Twin Brook Forest, MD
- Average humidity in December: 77%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is July (70%).
Average rainfall in December
Twin Brook Forest, MD
- Average rainfall in December: 2.44"
The wettest month (with the highest rainfall) is August (3.9").
The driest month (with the least rainfall) is January (1.97").
Average rainfall days in December
Twin Brook Forest, MD
- Average rainfall days in December: 9.9 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is November (9.2 days).
Average snowfall in December
Twin Brook Forest, MD
- Average snowfall in December: 1.42"
The month with the highest snowfall is March (3.03").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Twin Brook Forest, MD
- Average snowfall days in December: 3.2 days
The months with the highest number of snowfall days are January and February (5.3 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
Twin Brook Forest, MD
- 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 48min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in December
Twin Brook Forest, MD
- Average sunshine days in December: 17.7 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (12 days).
Average UV index in December
Twin Brook Forest, MD
- 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
Twin Brook Forest, MD
- Average cloud cover in December: 45
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Twin Brook Forest, MD
- 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).
Twin Brook Forest, Maryland, USA
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