December weather forecast
Twin Brook, MD

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Weather in December

December, the first month of the winter in Twin Brook, is also a frosty month, with temperature in the range of an average high of 45.3°F (7.4°C) and an average low of 32.9°F (0.5°C).

Temperature

As November makes way for December, Twin Brook's average high-temperature eases from a cool 53.4°F (11.9°C) to a frosty 45.3°F (7.4°C). During December, the nighttime temperature averages to a wintry 32.9°F (0.5°C).

Humidity

December is the most humid month in Twin Brook, Maryland, with an average relative humidity of 77%.

Rainfall

In Twin Brook, during December, the rain falls for 9.9 days and regularly aggregates up to 2.44" (62mm) of precipitation. In Twin Brook, during the entire year, the rain falls for 156.8 days and collects up to 30.98" (787mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Twin Brook, in December, during 3.2 snowfall days, 1.42" (36mm) of snow is typically accumulated. Throughout the year, there are 17.7 snowfall days, and 9.92" (252mm) of snow is accumulated.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:09 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:56 pm EST.

Sunshine

The month with the least sunshine is December, with an average of 5h of 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 estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 2 in December converts into the following recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.

Frequently asked questions

What is the temperature in December?

In Twin Brook, 45.3°F (7.4°C) is the average high-temperature and 32.9°F (0.5°C) is the average low-temperature during December. In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, is calculated to be 95°F (35°C).

What is the most humid month?

The most humid month is December, with an average relative humidity of 77%.

What is the average humidity in December?

In December, the average relative humidity is 77%.

How much does it rain in December?

In Twin Brook, in December, during 9.9 rainfall days, 2.44" (62mm) of precipitation is typically accumulated.

How much does it snow in December?

In December, it is snowing for 3.2 days. Throughout December, 1.42" (36mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 30min of daylight.

What is the average length of the day in December?

The average day length in December in Twin Brook is 9h and 29min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:09 am and sunset at 4:46 pm. On the last day of the month, in Twin Brook, sunrise is at 7:27 am and sunset at 4:56 pm EST.

What is the month with the least sunshine?

With an average of 5h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December?

In Twin Brook, the average sunshine duration in December is 5h.

When is the lowest UV index?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Twin Brook, MD

Average temperature in December - Twin Brook, 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, MD

Average pressure in December - Twin Brook, 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, MD

Average wind speed in December - Twin Brook, 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, MD

Average humidity in December - Twin Brook, 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, MD

Average rainfall in December - Twin Brook, 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, MD

Average rainfall days in December - Twin Brook, 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, MD

Average snowfall in December - Twin Brook, 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, MD

Average snowfall days in December - Twin Brook, 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, MD

Average daylight in December / Average sunshine in December - Twin Brook, 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, MD

Average sunshine days in December - Twin Brook, 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, MD

Average UV index in December - Twin Brook, 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, MD

Average cloud cover in December - Twin Brook, 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, MD

Average visibility in December - Twin Brook, 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, Maryland, USA

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