December weather forecast
Annapolis, MD

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The Chesapeake Bay at dusk, in Annapolis, Maryland, with a distant view of the US Naval Academy chapel dome
The Chesapeake Bay at dusk, in Annapolis, Maryland, with a distant view of the US Naval Academy chapel dome

Weather in December

December brings the full arrival of winter, with colder days and longer nights. The temperature drops further with the noticeable chill in the air signaling the arrival of the holiday season. A notable feature of December in Annapolis is its first snowfall, with an average thickness of 0.12" (3mm). Despite the lower temperatures, the city's atmosphere becomes more festive. Annapolis in December is a frosted beauty garnished with sparkling lights.

Temperature

The onset of December in Annapolis results in a small decrease in the average high-temperature, moderately receding from a cool 54.5°F (12.5°C) in November to a frosty 46°F (7.8°C). The average temperature during December nights in Annapolis is registered at a wintry 36.5°F (2.5°C).

Humidity

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

Rainfall

In December, the rain falls for 7.4 days. Throughout December, 0.67" (17mm) of precipitation is accumulated. In Annapolis, during the entire year, the rain falls for 120.4 days and collects up to 10.47" (266mm) of precipitation.

Snowfall

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

Ocean temperature

In Annapolis, Maryland, in December, the average water temperature is 51.6°F (10.9°C).
Note: It is life-risking to swim in 51.6°F (10.9°C). Briefly staying in 55.4°F (13°C) waters feels unsettling, and temperatures below 50°F (10°C) might result in cold shock and loss of breath control, hinging on personal endurance.

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 7:06 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:53 pm EST.

Sunshine

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

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In December, the maximum UV index of 2 translates into these guidelines:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. During bright days, sunglasses that offer UVA and UVB defense are recommended. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
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Frequently asked questions

What are the temperatures in Annapolis in December?

December temperatures vary between a high-temperature of 46°F (7.8°C) and a low-temperature of 36.5°F (2.5°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 89.6°F (32°C).

What is the average humidity in December in Annapolis?

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

How much does it rain in Annapolis in December?

In December, in Annapolis, the rain falls for 7.4 days. Throughout December, 0.67" (17mm) of precipitation is 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.

What is the water temperature in December in Annapolis?

In Annapolis, Maryland, the average seawater temperature in December 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?

The month with the shortest days in Annapolis, Maryland, is December, with an average of 9h and 30min of daylight.

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

In Annapolis, the average day length in December is 9h and 29min.

When is the sunrise / sunset in December in Annapolis?

In December, on the first day of the month, sunrise is at 7:06 am and sunset at 4:44 pm. On the last day of the month, in Annapolis, Maryland, sunrise is at 7:24 am and sunset at 4:53 pm EST.

How long on average sun shines in December in Annapolis?

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

When is the lowest UV index in Annapolis?

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

What is the UV index reading in December in Annapolis?

In Annapolis, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
54.5°F 12.5°C
46°F 7.8°C
40.3°F 4.6°C
Average low temperature
43.2°F 6.2°C
36.5°F 2.5°C
29.8°F -1.2°C
Average pressure
30.13" 765mmHg
30.11" 765mmHg
30.1" 765mmHg
Average wind speed
9.3mph 15km/h
9.3mph 15km/h
10mph 16.1km/h
Average max. wind speed
9.9mph 15.9km/h
9.9mph 15.9km/h
10.7mph 17.2km/h
Average wind speed gusts
15.2mph 24.5km/h
15.1mph 24.3km/h
16mph 25.7km/h
Average humidity
72%
75%
72%
Average rainfall
0.51" 13mm
0.67" 17mm
0.47" 12mm
Average rainfall days
5.3
7.4
6
Average snowfall
0.04" 1mm
0.12" 3mm
0.67" 17mm
Average snowfall days
0.4
1.5
2.3
Average sea temperature
57.9°F 14.4°C
51.7°F 10.9°C
46.7°F 8.2°C
Average daylight
10h 1min
9h 3min
9h 5min
Average sunshine
5h 5min
5h 1min
5h 2min
Average sunshine days
23.4
21.5
23
Average UV index
3
2
2
Average cloud cover
36%
44%
43%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in December
Annapolis, MD

Average temperature in December - Annapolis, MD
  • Average high temperature in December: 46°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 (40.3°F).

  • Average low temperature in December: 36.5°F

The month with the highest average low temperature is July (72°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).

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Average pressure in December
Annapolis, MD

Average pressure in December - Annapolis, MD
  • Average pressure in December: 30.11"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
Annapolis, MD

Average wind speed in December - Annapolis, MD
  • Average wind speed in December: 9.3mph

The windiest month (with the highest average wind speed) is January (10mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

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Average humidity in December
Annapolis, MD

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

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

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Average rainfall in December
Annapolis, MD

Average rainfall in December - Annapolis, MD
  • Average rainfall in December: 0.67"

The wettest month (with the highest rainfall) is August (1.69").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in December
Annapolis, MD

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

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

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Average snowfall in December
Annapolis, MD

Average snowfall in December - Annapolis, MD
  • Average snowfall in December: 0.12"

The month with the highest snowfall is January (0.67").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Annapolis, MD

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).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in December
Annapolis, MD

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).

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

Average daylight in December / Average sunshine in December - Annapolis, 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).

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Average sunshine days in December
Annapolis, MD

Average sunshine days in December - Annapolis, MD
  • Average sunshine days in December: 21.5 days

The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is August (13.8 days).

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Average UV index in December
Annapolis, MD

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

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Average cloud cover in December
Annapolis, MD

Average cloud cover in December - Annapolis, MD
  • Average cloud cover in December: 44

The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).

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Average visibility in December
Annapolis, MD

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

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

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Annapolis, Maryland, USA

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