December weather forecast
Glenn Dale, MD

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Weather in December

The first month of the winter, December, is still a chilly month in Glenn Dale, Maryland, with an average temperature varying between 34.5°F (1.4°C) and 45.5°F (7.5°C).

Temperature

The shift from November to December includes a minor decrease in the average high-temperature, lightly dropping from a fresh 54°F (12.2°C) to a chilly 45.5°F (7.5°C). Throughout December, the nighttime temperature averages to an icy 34.5°F (1.4°C).

Humidity

In Glenn Dale, Maryland, the average relative humidity in December is 76%.

Rainfall

In Glenn Dale, in December, it is raining for 9.8 days, with typically 2.68" (68mm) of accumulated precipitation. In Glenn Dale, during the entire year, the rain falls for 156.7 days and collects up to 31.81" (808mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Glenn Dale, in December, during 2.4 snowfall days, 0.63" (16mm) of snow is typically accumulated. Throughout the year, there are 13.6 snowfall days, and 6.73" (171mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of December, sunrise is at 7:07 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:55 pm EST.

Sunshine

In December, the average sunshine is 5.1h.

UV index

January 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 low health risk from exposure to the Sun's UV rays for average individuals.
Note: In December, a regular UV index of 2 translates into these guidelines:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Always opt for UVA and UVB-resistant sunglasses on radiant days. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.

Frequently asked questions

What is the average December temperature?

During December, Glenn Dale experiences an average high-temperature of 45.5°F (7.5°C) and a low-temperature of 34.5°F (1.4°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, in August is appraised at 93.2°F (34°C).

What is the average humidity in December?

In Glenn Dale, the average relative humidity in December is 76%.

How much does it rain in December?

In Glenn Dale, in December, it is raining for 9.8 days, with typically 2.68" (68mm) of accumulated precipitation.

How much does it snow in December?

In Glenn Dale, Maryland, in December, during 2.4 snowfall days, 0.63" (16mm) of snow is typically accumulated.

What is the month with the shortest days?

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

What is the average length of the day in December?

In Glenn Dale, the average day length in December is 9h and 29min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:07 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:55 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 5.1h.

What is the month with the lowest UV index?

January 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?

In Glenn Dale, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to UV radiation.
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
Glenn Dale, MD

Average temperature in December - Glenn Dale, MD
  • Average high temperature in December: 45.5°F

The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (39.7°F).

  • Average low temperature in December: 34.5°F

The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (28°F).

Average pressure in December
Glenn Dale, MD

Average pressure in December - Glenn Dale, 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 (29.94"Hg).

Average wind speed in December
Glenn Dale, MD

Average wind speed in December - Glenn Dale, MD
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).

Average humidity in December
Glenn Dale, MD

Average humidity in December - Glenn Dale, MD
  • Average humidity in December: 76%

The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is April (71%).

Average rainfall in December
Glenn Dale, MD

Average rainfall in December - Glenn Dale, MD
  • Average rainfall in December: 2.68"

The wettest month (with the highest rainfall) is August (3.62").
The driest month (with the least rainfall) is January (2.05").

Average rainfall days in December
Glenn Dale, MD

Average rainfall days in December - Glenn Dale, MD
  • Average rainfall days in December: 9.8 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (8.9 days).

Average snowfall in December
Glenn Dale, MD

Average snowfall in December - Glenn Dale, MD
  • Average snowfall in December: 0.63"

The month with the highest snowfall is January (2.36").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Glenn Dale, MD

Average snowfall days in December - Glenn Dale, MD
  • Average snowfall days in December: 2.4 days

The month with the highest number of snowfall days is January (4.3 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
Glenn Dale, MD

Average daylight in December / Average sunshine in December - Glenn Dale, 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 1min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in December
Glenn Dale, MD

Average sunshine days in December - Glenn Dale, MD
  • Average sunshine days in December: 18.2 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (11.5 days).

Average UV index in December
Glenn Dale, MD

Average UV index in December - Glenn Dale, 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 and December (UV index 2).

Average cloud cover in December
Glenn Dale, MD

Average cloud cover in December - Glenn Dale, 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 29).

Average visibility in December
Glenn Dale, MD

Average visibility in December - Glenn Dale, MD
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Glenn Dale, Maryland, USA

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