December weather forecast
Charlestown, MD

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Weather in December

December, the first month of the winter in Charlestown, is still a chilly month, with temperature in the range of an average high of 44.1°F (6.7°C) and an average low of 33.1°F (0.6°C).

Temperature

December witnesses a gentle descent in average high-temperature, descending from November's cool 53.1°F (11.7°C) to a chilly 44.1°F (6.7°C). December nights are marked by an average low-temperature of 33.1°F (0.6°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

In December, in Charlestown, the rain falls for 9.8 days. Throughout December, 2.4" (61mm) of precipitation is accumulated. Throughout the year, there are 150.3 rainfall days, and 29.25" (743mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

In December, the average ocean temperature in Charlestown, Maryland, is 48.6°F (9.2°C).
Note: Diving into 48.6°F (9.2°C) is practical below 50°F (10°C), given you're wearing protective swim gear; without it, expect a quick onset of cold shock and a struggle to breathe. Merely touching waters at 55.4°F (13°C) feels ice-cold.

Daylight

The month with the shortest days in Charlestown is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:40 pm. On the last day of December, in Charlestown, Maryland, sunrise is at 7:24 am and sunset at 4:50 pm EST.

Sunshine

In December, the average sunshine is 5.1h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Charlestown. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: A daily maximum UV index of 2 in December translates into the following instructions:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
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Frequently asked questions

How cold does it get in Charlestown in December?

In Charlestown, 44.1°F (6.7°C) is the average high-temperature and 33.1°F (0.6°C) is the average low-temperature during December. In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is evaluated at 89.6°F (32°C).

What is the average humidity in December in Charlestown?

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

How many days does it rain in December in Charlestown?

In December, in Charlestown, the rain falls for 9.8 days. Throughout December, 2.4" (61mm) of precipitation is accumulated.

How many days does it snow in December in Charlestown?

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

How cold is the water 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?

December has the shortest days of the year in Charlestown, with an average of 9h and 24min of daylight.

What is the average length of the day in December in Charlestown?

The average day length in December in Charlestown is 9h and 26min.

When are sunrise and sunset in December in Charlestown?

On the first day of December, sunrise is at 7:05 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:50 pm EST.

How long on average sun shines in December in Charlestown?

In Charlestown, the average sunshine duration in December is 5.1h.

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

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

What is the UV index intensity in December in Charlestown?

In Charlestown, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
53.1°F 11.7°C
44.1°F 6.7°C
37.9°F 3.3°C
Average low temperature
39.2°F 4°C
33.1°F 0.6°C
26.1°F -3.3°C
Average pressure
30.13" 765mmHg
30.1" 765mmHg
30.09" 764mmHg
Average wind speed
7.7mph 12.4km/h
8.1mph 13km/h
8.8mph 14.2km/h
Average max. wind speed
8.4mph 13.5km/h
8.8mph 14.2km/h
9.6mph 15.4km/h
Average wind speed gusts
12.8mph 20.6km/h
13.2mph 21.2km/h
14.2mph 22.9km/h
Average humidity
75%
77%
75%
Average rainfall
2.01" 51mm
2.4" 61mm
1.85" 47mm
Average rainfall days
8.1
9.8
7.8
Average snowfall
0.31" 8mm
0.83" 21mm
2.24" 57mm
Average snowfall days
0.2
1.7
4.4
Average sea temperature
55.5°F 13.1°C
48.5°F 9.2°C
42.4°F 5.8°C
Average daylight
10h 0min
9h 2min
9h 5min
Average sunshine
5h 5min
5h 1min
5h 1min
Average sunshine days
20.4
18.9
19.3
Average UV index
2
2
2
Average cloud cover
36%
45%
44%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

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"Hg

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

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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%

The 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").
The 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).
The 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: 9h and 2min

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 24min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

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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

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).

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Average cloud cover in December
Charlestown, MD

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

The 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

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

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Charlestown, Maryland, USA

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