December weather forecast
Old Germantown, MD

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Weather in December

December, the first month of the winter in Old Germantown, is also a frosty month, with an average temperature ranging between min 31.8°F (-0.1°C) and max 44.2°F (6.8°C).

Temperature

December ushers in a minute temperature change, with average high-temperatures reducing from November's fresh 53.1°F (11.7°C) to a frosty 44.2°F (6.8°C). Old Germantown experiences a mean temperature of 31.8°F (-0.1°C) during December nights.

Humidity

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

Rainfall

In Old Germantown, in December, during 10.5 rainfall days, 2.36" (60mm) of precipitation is typically accumulated. Throughout the year, there are 159.4 rainfall days, and 30.71" (780mm) of precipitation is accumulated.

Snowfall

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

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 7:10 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

The average sunshine in December is 5.2h.

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 threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 2 in December translates into these instructions:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. The solar radiation around mid-day is intense; avoid the Sun and stay safe. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

Frequently asked questions

Is December cold?

The high-temperature, in December, in Old Germantown, is 44.2°F (6.8°C), while the low-temperature averages to 31.8°F (-0.1°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is estimated at 93.2°F (34°C).

What are the most humid months?

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 Old Germantown?

In December, the average relative humidity 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 much 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 in Old Germantown, Maryland, with an average of 9h and 30min of daylight.

How many hours of daylight does Old Germantown have in December?

The average day length in December is 9h and 28min.

When are sunrise and sunset in December?

On the first day of December, 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 Old Germantown have in December?

The average sunshine duration in December is 5.2h.

What are the months 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.

What is the UV index reading in December?

In Old Germantown, the average daily maximum UV index in December 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
Old Germantown, MD

Average temperature in December - Old 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
Old Germantown, MD

Average pressure in December - Old 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
Old Germantown, MD

Average wind speed in December - Old 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
Old Germantown, MD

Average humidity in December - Old 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
Old Germantown, MD

Average rainfall in December - Old 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
Old Germantown, MD

Average rainfall days in December - Old 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
Old Germantown, MD

Average snowfall in December - Old 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
Old Germantown, MD

Average snowfall days in December - Old 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
Old Germantown, MD

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

Average sunshine days in December - Old 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
Old Germantown, MD

Average UV index in December - Old 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
Old Germantown, MD

Average cloud cover in December - Old 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
Old Germantown, MD

Average visibility in December - Old 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).

Old Germantown, Maryland, USA

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