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 average temperature ranging between min 31.8°F (-0.1°C) and max 46.8°F (8.2°C).

Temperature

In Annapolis, the average high-temperature drops, from a moderate 56.8°F (13.8°C) in November, to a frosty 46.8°F (8.2°C). In Annapolis, in December, the average low-temperature is 31.8°F (-0.1°C).

Rainfall

In Annapolis, during December, the rain falls for 9.8 days and regularly aggregates up to 3.6" (90.4mm) of precipitation. In Annapolis, during the entire year, the rain falls for 115.1 days and collects up to 47.3" (1200.7mm) of precipitation.

Ocean temperature

In Annapolis, Maryland, the average seawater temperature is 51.6°F (10.9°C).
Note: 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.

Daylight

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

Sunshine

January, November and December, with an average of 5h of sunshine, are months with the least sunshine in Annapolis.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Annapolis. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in December in Annapolis?

In Annapolis, in December, the average high-temperature is 46.8°F (8.2°C), and the average low-temperature is 31.8°F (-0.1°C).

How much does it rain in Annapolis in December?

In Annapolis, in December, during 9.8 rainfall days, 3.6" (90.4mm) of precipitation is typically accumulated.

What is the ocean temperature in December in Annapolis?

In Annapolis, Maryland, in December, the average water temperature is 51.6°F (10.9°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in Annapolis?

The month with the shortest days is December, with an average of 9.5h of daylight.

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

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

What is the month with the least sunshine in Annapolis?

Months with the least sunshine in Annapolis, Maryland, are January, November and December, with an average of 5h of sunshine.

How long on average sun shines in December in Annapolis?

In December, the average sunshine in Annapolis, Maryland, is 5h.

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

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

How high is the UV index in December in Annapolis?

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health threat from unprotected exposure to the UV radiation.
Average temperature in December - Annapolis, MD
  • Average high temperature in December: 46.8°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (42.7°F).

  • Average low temperature in December: 31.9°F

The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (29.1°F).

Average rainfall in December - Annapolis, MD
  • Average rainfall in December: 3.6"

The wettest month (with the highest rainfall) is September (4.8").
The driest month (with the lowest rainfall) is February (2.9").

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

Months with the highest number of rainy days are March and April (11.2 days).
Months with the lowest number of rainy days are September and October (7.8 days).

Average sea temperature in December - Annapolis, MD
  • Average sea temperature in December: 51.7°F

The best month for swimming (with the highest average sea temperature) is August (77.8°F).
The coldest month (with the lowest average sea temperature) is February (45.1°F).

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: 5h

Months with most sunshine are June, July and August (Average sunshine: 9h).
Months with least sunshine are January, November and December (Average sunshine: 5).

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

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 2).