December weather forecast and climate
Charlestown, MD

Weather in December

The first month of the winter, December, is still a chilly month in Charlestown, Maryland, with average temperature ranging between min 33.1°F (0.6°C) and max 44.1°F (6.7°C).

Temperature

In December, the average high-temperature slightly decreases, from a fresh 53.1°F (11.7°C) in November, to a chilly 44.1°F (6.7°C). In Charlestown, the average low-temperature is 33.1°F (0.6°C).

Humidity

In Charlestown, the average relative humidity in December is 77%.

Rainfall

In Charlestown, Maryland,, during 9.8 rainfall days, 2.4" (61mm) of precipitation is typically accumulated. Throughout the year, there are 150.3 rainfall days, and 29.25" (743mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through March, May, November and December. In December, it is snowing for 1.7 days. Throughout December, 0.83" (21mm) of snow is accumulated. Throughout the year, in Charlestown, there are 13.1 snowfall days, and 6.89" (175mm) of snow is accumulated.

Ocean temperature

In December, the average ocean temperature in Charlestown is 48.6°F (9.2°C).
Note: Swimming in 48.6°F (9.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

December has the shortest days of the year, with an average of 9.4h of daylight.

Sunshine

The average sunshine in Charlestown, Maryland, is 5.1h.

UV index

Months with the lowest UV index in Charlestown are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Charlestown?

The average relative humidity in December in Charlestown, Maryland, is 77%.

How many days does it rain in December in Charlestown?

In Charlestown, in December, during 9.8 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

How much does it snow in Charlestown in December?

In Charlestown, Maryland, in December, snow falls for 1.7 days, with typically accumulated 0.83" (21mm) of snow.

What is the ocean temperature in December in Charlestown?

In Charlestown, Maryland, the average seawater temperature in December is 48.6°F (9.2°C). Swimming in 48.6°F (9.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Charlestown?

With an average of 9.4h of daylight, December has the shortest days of the year in Charlestown.

How many hours of daylight does Charlestown have in December?

In Charlestown, Maryland, the average length of the day in December is 9.4h.

How many hours of sunshine does Charlestown have in December?

The average sunshine in December in Charlestown, Maryland, is 5.1h.

What is the month with the lowest UV index in Charlestown?

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

What is the UV index reading in December in Charlestown?

The average daily maximum UV index in December in Charlestown is 2. A UV Index value of 2, and less, symbolizes a low health threat from unsafe exposure to the Sun's UV rays.

Average temperature in December
Charlestown, MD

Average temperature in December - Charlestown, MD
  • Average high temperature in December: 44.1°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in December: 33.1°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

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Average pressure in December
Charlestown, MD

Average pressure in December - Charlestown, MD
  • Average pressure in December: 30.1"

The month with the highest atmospheric pressure is November (30.13").
The month with the lowest atmospheric pressure is June (29.94").

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Average wind speed in December
Charlestown, MD

Average wind speed in December - Charlestown, MD
  • Average wind speed in December: 8.1mph

The windiest months (with the highest average wind speed) are February and March (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

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Average humidity in December
Charlestown, MD

Average humidity in December - Charlestown, MD
  • Average humidity in December: 77%

Months with the highest relative humidity are May and June (79%).
The month with the lowest relative humidity is April (74%).

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Average rainfall in December
Charlestown, MD

Average rainfall in December - Charlestown, MD
  • Average rainfall in December: 2.4"

The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (1.85").

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Average rainfall days in December
Charlestown, MD

Average rainfall days in December - Charlestown, MD
  • Average rainfall days in December: 9.8 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall in December
Charlestown, MD

Average snowfall in December - Charlestown, MD
  • Average snowfall in December: 0.83"

The month with the highest snowfall is January (2.24").
Months with the least snowfall are April, June, July, August, September and October (0").

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Average snowfall days in December
Charlestown, MD

Average snowfall days in December - Charlestown, MD
  • Average snowfall days in December: 1.7 days

The month with the highest number of snowfall days is January (4.4 days).
Months with the least snowfall days are April, June, July, August, September and October (0 days).

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Average sea temperature in December
Charlestown, MD

Average sea temperature in December - Charlestown, MD
  • Average sea temperature in December: 48.5°F

The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (40.9°F).

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

Average daylight in December / Average sunshine in December - Charlestown, MD
  • Average daylight in December: 9.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in December: 5.1h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is February (Average sunshine: 4.9h).

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Average sunshine days in December
Charlestown, MD

Average sunshine days in December - Charlestown, MD
  • Average sunshine days in December: 18.9 days

The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (11.6 days).

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Average UV index in December
Charlestown, MD

Average UV index in December - Charlestown, MD
  • Average UV index in December: 2

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Charlestown, MD

Average cloud cover in December - Charlestown, MD
  • Average cloud cover in December: 45

Months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in December
Charlestown, MD

Average visibility in December - Charlestown, MD
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
Months with the lowest visibility are May and September (5mi).

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