December weather forecast
North Potomac, MD

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Weather in December

The first month of the winter, December, is still a chilly month in North Potomac, Maryland, with temperature in the range of an average high of 45.5°F (7.5°C) and an average low of 32.9°F (0.5°C).

Temperature

December brings a slight decrease in the average high-temperature, shifting from a fresh 53.4°F (11.9°C) in November to a chilly 45.5°F (7.5°C). In the month of December, North Potomac witnesses a consistent average low-temperature of 32.9°F (0.5°C).

Humidity

October and December, with an average relative humidity of 76%, are the most humid months.

Rainfall

In North Potomac, Maryland, in December, it is raining for 9.8 days, with typically 2.36" (60mm) of accumulated precipitation. Throughout the year, there are 156.5 rainfall days, and 30.71" (780mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In North Potomac, in December, during 2.5 snowfall days, 1.57" (40mm) of snow is typically accumulated. In North Potomac, during the entire year, snow falls for 15.5 days and aggregates up to 10.24" (260mm) 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 7:09 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 average sunshine in December in North Potomac is 5.1h.

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 reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: During December, 2 as the daily maximum UV index converts into the following advice:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.

Frequently asked questions

What is the usual temperature for North Potomac in December?

In North Potomac, 45.5°F (7.5°C) is the average high-temperature and 32.9°F (0.5°C) is the average low-temperature during December. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is evaluated at 95°F (35°C).

What is the most humid month in North Potomac?

The months with the highest humidity are October and December, with an average relative humidity of 76%.

What is the average humidity in December?

In December, the average relative humidity in North Potomac, Maryland, is 76%.

How many days does it rain in December?

In North Potomac, in December, during 9.8 rainfall days, 2.36" (60mm) of precipitation is typically accumulated.

How much does it snow in December?

In North Potomac, during December, snow falls for 2.5 days and regularly aggregates up to 1.57" (40mm) of snow.

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 North Potomac have in December?

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

When is the sunrise / sunset in December in North Potomac?

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.

How long on average sun shines in December?

In December, the average sunshine duration is 5.1h.

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 intensity in December?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health threat 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
North Potomac, MD

Average temperature in December - North Potomac, MD
  • Average high temperature in December: 45.5°F

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.4°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 (26.4°F).

Average pressure in December
North Potomac, MD

Average pressure in December - North Potomac, 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
North Potomac, MD

Average wind speed in December - North Potomac, MD
  • Average wind speed in December: 6.9mph

The windiest month (with the highest average wind speed) is March (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

Average humidity in December
North Potomac, MD

Average humidity in December - North Potomac, MD
  • Average humidity in December: 76%

The months with the highest relative humidity are October and December (76%).
The month with the lowest relative humidity is July (69%).

Average rainfall in December
North Potomac, MD

Average rainfall in December - North Potomac, MD
  • Average rainfall in December: 2.36"

The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is February (1.93").

Average rainfall days in December
North Potomac, MD

Average rainfall days in December - North Potomac, MD
  • Average rainfall days in December: 9.8 days

The month with the highest number of rainy days is August (17.3 days).
The month with the least rainy days is January (8.1 days).

Average snowfall in December
North Potomac, MD

Average snowfall in December - North Potomac, MD
  • Average snowfall in December: 1.57"

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
North Potomac, MD

Average snowfall days in December - North Potomac, MD
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is February (4.8 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
North Potomac, MD

Average daylight in December / Average sunshine in December - North Potomac, 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 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in December
North Potomac, MD

Average sunshine days in December - North Potomac, MD
  • Average sunshine days in December: 18.4 days

The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is May (11.7 days).

Average UV index in December
North Potomac, MD

Average UV index in December - North Potomac, 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
North Potomac, MD

Average cloud cover in December - North Potomac, MD
  • Average cloud cover in December: 46

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
North Potomac, MD

Average visibility in December - North Potomac, 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).

North Potomac, Maryland, USA

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