January weather forecastAnnapolis, MD

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

January

Weather in January

The year kicks off with typical winter weather in Annapolis. The chilly sensation is in part due to a maximum daytime temperature barely exceeding 40.3°F (4.6°C), along with nighttime lows often dipping just below freezing. This month is marked by an almost constant cloud cover and robust winds. The conditions in January can create slippery roads and necessitate heavier clothing.

Temperature

Annapolis witnesses the coldest weather in January, with temperatures averaging a high of 40.3°F (4.6°C) and a low of 29.8°F (-1.2°C).

Humidity

January, March, April and November, with an average relative humidity of 72%, are the least humid months.

Rainfall

The month with the least rainfall is January, when the rain falls for 6 days and typically collects 0.47" (12mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall. January is the month with the most snowfall in Annapolis. Snow falls for 2.3 days and accumulates 0.67" (17mm) of snow.

Ocean temperature

In Annapolis, in January, the average water temperature is 46.8°F (8.2°C).
Note: Unprotected swimming in 46.8°F (8.2°C) is dangerous due to potential cold shock. Especially when temperatures go below 50°F (10°C), leading to hyperventilation.

Daylight

In January, the average length of the day is 9h and 48min.
On the first day of January, sunrise is at 7:24 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 5:25 pm EST.

Sunshine

The average sunshine in January is 5.3h.

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 hazard from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index of 2 during January translates into these guidelines:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Enhance your sun protection with tightly woven, yet airy clothing. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.

Updated: Jun 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

January is the coldest month of the year, registering average temperatures as high as 40.3°F (4.6°C) and as low as 29.8°F (-1.2°C).

Annapolis in January has an average high-temperature of 40.3°F (4.6°C) and an average low-temperature of 29.8°F (-1.2°C).

The months with the lowest humidity are January, March, April and November, with an average relative humidity of 72%.

The average relative humidity in January is 72%.

The month with the least rainfall is January, when the rain falls for 6 days and typically collects 0.47" (12mm) of precipitation.

In Annapolis, in January, it is raining for 6 days, with typically 0.47" (12mm) of accumulated precipitation.

January is the month with the most snowfall. Snow falls for 2.3 days and accumulates 0.67" (17mm) of snow.

In Annapolis, Maryland, in January, during 2.3 snowfall days, 0.67" (17mm) of snow is typically accumulated.

In Annapolis, in January, the average water temperature is 46.8°F (8.2°C). Swimming in 46.8°F (8.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

The average day length in January is 9h and 48min.

On the first day of January, sunrise is at 7:24 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 5:25 pm EST.

In Annapolis, the average sunshine duration in January is 5.3h.

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

In January, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

46°F

40.3°F

43°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

9.9mph

10.7mph

10.6mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

1.5

2.3

2.5

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

21.5

19.2

Average UV index

Average cloud cover

Average visibility

Average temperature in January
Annapolis, MD

Average high temperature in January: 40.3°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 January: 29.8°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).

Average pressure in January
Annapolis, MD

Average pressure in January: 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).

Average wind speed in January
Annapolis, MD

Average wind speed in January: 10mph

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).

Average humidity in January
Annapolis, MD

Average humidity in January: 72%

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

Average rainfall in January
Annapolis, MD

Average rainfall in January: 0.47"

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

Average rainfall days in January
Annapolis, MD

Average rainfall days in January: 6 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).

Average snowfall in January
Annapolis, MD

Average snowfall in January: 0.67"

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").

Average snowfall days in January
Annapolis, MD

Average snowfall days in January: 2.3 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).

Average sea temperature in January
Annapolis, MD

Average sea temperature in January: 46.7°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 January /
Average sunshine in January
Annapolis, MD

Average daylight in January: 9h and 48min

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 January: 5h and 18min

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).

Average sunshine days in January
Annapolis, MD

Average sunshine days in January: 23 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).

Average UV index in January
Annapolis, MD

Average UV index in January: 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).

Average cloud cover in January
Annapolis, MD

Average cloud cover in January: 43

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).

Average visibility in January
Annapolis, MD

Average visibility in January: 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).