Annapolis
Maryland, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Annapolis, MD

A view of Chesapeake Bay at dusk, in Annapolis, Maryland, with a distant view of the US Naval Academy chapel dome
A view of Chesapeake Bay at dusk, in Annapolis, Maryland, with a distant view of the US Naval Academy chapel dome
The first month of the winter, December, is also a frosty month in Annapolis, Maryland, with temperature in the range of an average low of 36.5°F (2.5°C) and an average high of 46°F (7.8°C).

Temperature

In Annapolis, the average high-temperature in December slightly decreases, from a cool 54.5°F (12.5°C) in November, to a frosty 46°F (7.8°C). The average low-temperature, in Annapolis, is 36.5°F (2.5°C).

Humidity

The average relative humidity in Annapolis is 75%.

Rainfall

In Annapolis, it is raining for 7.4 days, with typically 0.67" (17mm) of accumulated precipitation. Throughout the year, in Annapolis, there are 120.4 rainfall days, and 10.47" (266mm) of precipitation is accumulated.

Snowfall

January through March, November and December are months with snowfall. In Annapolis, Maryland, during December, snow falls for 1.5 days and regularly aggregates up to 0.12" (3mm) of snow. Throughout the year, there are 8.3 snowfall days, and 1.22" (31mm) of snow is accumulated.

Ocean temperature

In December, the average ocean temperature in Annapolis, Maryland, is 51.6°F (10.9°C).
Note: Swimming in 51.6°F (10.9°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

December has the shortest days of the year, with an average of 9.5h of daylight.

Sunshine

In December, the average sunshine is 5.2h.

UV index

Months with the lowest UV index in Annapolis are January, February 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 the average person.
Note: The daily maximum UV index of 2 interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Annapolis?

In December, in Annapolis, Maryland, the average high-temperature is 46°F (7.8°C), and the average low-temperature is 36.5°F (2.5°C).

What is the average humidity in December in Annapolis?

In December, the average relative humidity in Annapolis, Maryland, is 75%.

How many days does it rain in December in Annapolis?

In Annapolis, in December, during 7.4 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.

How much does it snow in Annapolis in December?

In Annapolis, in December, during 1.5 snowfall days, 0.12" (3mm) of snow is typically accumulated.

How cold is the water in December in Annapolis?

In December, the average ocean temperature in Annapolis, Maryland, is 51.6°F (10.9°C). Swimming in 51.6°F (10.9°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 Annapolis?

With an average of 9.5h of daylight, December has the shortest days of the year in Annapolis, Maryland.

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

In Annapolis, Maryland, the average length of the day in December is 9.5h.

How many hours of sunshine does Annapolis have in December?

In Annapolis, Maryland, the average sunshine in December is 5.2h.

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

January, February 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 Annapolis?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health threat from unprotected exposure to the UV radiation.
Average temperature in December - Annapolis, MD
  • Average high temperature in December: 7.8°C

The warmest month (with the highest average high temperature) is July (29.3°C).
The month with the lowest average high temperature is January (4.6°C).

  • Average low temperature in December: 2.5°C

The month with the highest average low temperature is July (22.2°C).
The coldest month (with the lowest average low temperature) is January (-1.2°C).

Average humidity in December - Annapolis, MD
  • Average humidity in December: 75%

The month with the highest relative humidity is May (78%).
Months with the lowest relative humidity are January, March, April and November (72%).

Average rainfall in December - Annapolis, MD
  • Average rainfall in December: 17mm

The wettest month (with the highest rainfall) is August (43mm).
The driest month (with the lowest rainfall) is January (12mm).

Average rainfall days in December - Annapolis, MD
  • Average rainfall days in December: 7.4 days

Months with the highest number of rainy days are July and August (14.3 days).
The month with the lowest number of rainy days is November (5.3 days).

Average snowfall in December - Annapolis, MD
  • Average snowfall in December: 3mm

The month with the highest snowfall is January (17mm).
Months with the lowest snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days in December - Annapolis, MD
  • Average snowfall days in December: 1.5 days

The month with the highest number of snowfall days is February (2.5 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in December - Annapolis, MD
  • Average sea temperature in December: 10.9°C

The best month for swimming (with the highest average sea temperature) is August (25.4°C).
The coldest month (with the lowest average sea temperature) is February (7.3°C).

Average daylight in December / Average sunshine in December - Annapolis, MD
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 5.2h

The month with most sunshine is July (Average sunshine: 10.8h).
The month with least sunshine is February (Average sunshine: 5h).

Average UV index in December - Annapolis, 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 and December (UV index 2).