December weather forecast
Germantown, MD

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Weather in December

The thin layer of snow common in December underscores the arrival of winter in Germantown. The frigid temperatures persist, bringing an end to the year on a cold note. Rainfall remains adequate, contributing to the dampness in the air. The sun shines with a weak intensity, offering little relief from the chill. The hardened gusts of wind that reach up to 11.5mph (18.5km/h) consolidate the winter feel, making December a month of frosts and fireplaces.

Temperature

The shift from November to December includes a small decrease in the average high-temperature, from a fresh 53.1°F (11.7°C) to a frosty 44.2°F (6.8°C). During December, Germantown records an average temperature of 31.8°F (-0.1°C) at night.

Humidity

The months with the highest humidity are October and December, with an average relative humidity of 78%.

Rainfall

In Germantown, Maryland, in December, during 10.5 rainfall days, 2.36" (60mm) of precipitation is typically accumulated. In Germantown, during the entire year, the rain falls for 159.4 days and collects up to 30.71" (780mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In Germantown, in December, during 3 snowfall days, 1.57" (40mm) of snow is typically accumulated. In Germantown, during the entire year, snow falls for 19.1 days and aggregates up to 10.04" (255mm) of snow.

Daylight

December has the shortest days of the year in Germantown, with an average of 9h and 30min of daylight.
On the first day of December in Germantown, sunrise is at 7:10 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:56 pm EST.

Sunshine

In Germantown, the average sunshine in December is 5.2h.

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 low threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the maximum UV index of 2 suggests these recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Updated: Aug 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

In December, the average high-temperature and low-temperature are 44.2°F (6.8°C) and 31.8°F (-0.1°C) respectively. In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 93.2°F (34°C).

What is the most humid month?

The months with the highest humidity are October and December, with an average relative humidity of 78%.

What is the average humidity in December in Germantown?

In Germantown, the average relative humidity in December is 78%.

How much does it rain in December?

In December, the rain falls for 10.5 days. Throughout December, 2.36" (60mm) of precipitation is accumulated.

How many days does it snow in December?

In December, it is snowing for 3 days. Throughout December, 1.57" (40mm) 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.

How many hours of daylight does Germantown have in December?

In December, the average day length is 9h and 28min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:10 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:56 pm EST.

How many hours of sunshine does Germantown have in December?

The average sunshine duration in December is 5.2h.

What is the month with 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?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's 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
Germantown, MD

Average temperature in December - Germantown, MD
  • Average high temperature in December: 44.2°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in December: 31.8°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).

Average pressure in December
Germantown, MD

Average pressure in December - Germantown, 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
Germantown, MD

Average wind speed in December - Germantown, MD
  • Average wind speed in December: 7mph

The windiest month (with the highest average wind speed) is March (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

Average humidity in December
Germantown, MD

Average humidity in December - Germantown, MD
  • Average humidity in December: 78%

The months with the highest relative humidity are October and December (78%).
The month with the lowest relative humidity is July (72%).

Average rainfall in December
Germantown, MD

Average rainfall in December - Germantown, MD
  • Average rainfall in December: 2.36"

The wettest month (with the highest rainfall) is August (3.78").
The driest months (with the least rainfall) are January and February (1.97").

Average rainfall days in December
Germantown, MD

Average rainfall days in December - Germantown, MD
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (17.5 days).
The months with the least rainy days are January and November (9.5 days).

Average snowfall in December
Germantown, MD

Average snowfall in December - Germantown, MD
  • Average snowfall in December: 1.57"

The month with the highest snowfall is March (2.83").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Germantown, MD

Average snowfall days in December - Germantown, MD
  • Average snowfall days in December: 3 days

The months with the highest number of snowfall days are January and February (5.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Germantown, MD

Average daylight in December / Average sunshine in December - Germantown, 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 January (Average sunshine: 5h and 0min).

Average sunshine days in December
Germantown, MD

Average sunshine days in December - Germantown, 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 July (11.3 days).

Average UV index in December
Germantown, MD

Average UV index in December - Germantown, 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
Germantown, MD

Average cloud cover in December - Germantown, 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
Germantown, MD

Average visibility in December - Germantown, 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).

Germantown, Maryland, USA

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