January weather forecast
Charlestown, MD

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Weather in January

January, the same as December, is a wintry winter month in Charlestown, Maryland, with an average temperature ranging between min 26.1°F (-3.3°C) and max 37.9°F (3.3°C).

Temperature

January, having an average high-temperature of 37.9°F (3.3°C) and an average low-temperature of 26.1°F (-3.3°C), is the coldest month.

Humidity

In Charlestown, the average relative humidity in January is 75%.

Rainfall

The month with the least rainfall is January, when the rain falls for 7.8 days and typically collects 1.85" (47mm) of precipitation.

Snowfall

Months with snowfall are January through March, May, November and December. The month with the most snowfall in Charlestown, Maryland, is January, when snow falls for 4.4 days and typically aggregates up to 2.24" (57mm) of snow.

Ocean temperature

In Charlestown, the average seawater temperature in January is 42.4°F (5.8°C).
Note: Immersing oneself in 42.4°F (5.8°C) at sub14°F (-10°C) temperatures is a recipe for harsh cold shock and quickened breathing unless adequately equipped.

Daylight

The average length of the day in January in Charlestown is 9h and 45min.
On the first day of January in Charlestown, sunrise is at 7:24 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 5:22 pm EST.

Sunshine

In January, the average sunshine in Charlestown 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, Maryland. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.
Note: The daily high UV index of 2 in January translates into this advice:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
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Frequently asked questions

What is the coldest time of year in Charlestown?

The coldest time of the year in Charlestown, Maryland, is January, with temperatures averaging a high of 37.9°F (3.3°C) and a low of 26.1°F (-3.3°C).

How cold is January in Charlestown?

January temperatures vary between a high-temperature of 37.9°F (3.3°C) and a low-temperature of 26.1°F (-3.3°C).

What is the average humidity in January in Charlestown?

In January, the average relative humidity in Charlestown is 75%.

What is the driest month in Charlestown?

The month with the least rainfall in Charlestown is January, when the rain falls for 7.8 days and typically collects 1.85" (47mm) of precipitation.

How much does it rain in Charlestown in January?

In Charlestown, in January, it is raining for 7.8 days, with typically 1.85" (47mm) of accumulated precipitation.

When does it snow the most in Charlestown?

The month with the most snowfall is January, when snow falls for 4.4 days and typically aggregates up to 2.24" (57mm) of snow.

How many days does it snow in January in Charlestown?

In Charlestown, Maryland, during January, snow falls for 4.4 days and regularly aggregates up to 2.24" (57mm) of snow.

What is the ocean temperature in January in Charlestown?

In Charlestown, in January, the average water temperature is 42.4°F (5.8°C). Swimming in 42.4°F (5.8°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.

How many hours of daylight does Charlestown have in January?

In Charlestown, Maryland, the average day length in January is 9h and 45min.

When is the sunrise / sunset in January in Charlestown?

In January, on the first day of the month, sunrise is at 7:24 am and sunset at 4:50 pm. On the last day of the month, in Charlestown, Maryland, sunrise is at 7:12 am and sunset at 5:22 pm EST.

How long on average sun shines in January in Charlestown?

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

When is the lowest UV index in Charlestown?

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

What is the UV index reading in January in Charlestown?

In Charlestown, Maryland, the average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
44.1°F 6.7°C
37.9°F 3.3°C
41.7°F 5.4°C
Average low temperature
33.1°F 0.6°C
26.1°F -3.3°C
28.6°F -1.9°C
Average pressure
30.1" 765mmHg
30.09" 764mmHg
30.06" 764mmHg
Average wind speed
8.1mph 13km/h
8.8mph 14.2km/h
8.9mph 14.3km/h
Average max. wind speed
8.8mph 14.2km/h
9.6mph 15.4km/h
9.6mph 15.4km/h
Average wind speed gusts
13.2mph 21.2km/h
14.2mph 22.9km/h
14.5mph 23.3km/h
Average humidity
77%
75%
77%
Average rainfall
2.4" 61mm
1.85" 47mm
1.89" 48mm
Average rainfall days
9.8
7.8
8.8
Average snowfall
0.83" 21mm
2.24" 57mm
1.65" 42mm
Average snowfall days
1.7
4.4
3.9
Average sea temperature
48.5°F 9.2°C
42.4°F 5.8°C
40.9°F 4.9°C
Average daylight
9h 2min
9h 5min
10h 4min
Average sunshine
5h 1min
5h 1min
4h 5min
Average sunshine days
18.9
19.3
15.9
Average UV index
2
2
2
Average cloud cover
45%
44%
46%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
Charlestown, MD

Average temperature in January - Charlestown, MD
  • Average high temperature in January: 37.9°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 January: 26.1°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 January
Charlestown, MD

Average pressure in January - Charlestown, MD
  • Average pressure in January: 30.09"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 January
Charlestown, MD

Average wind speed in January - Charlestown, MD
  • Average wind speed in January: 8.8mph

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 January
Charlestown, MD

Average humidity in January - Charlestown, MD
  • Average humidity in January: 75%

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 January
Charlestown, MD

Average rainfall in January - Charlestown, MD
  • Average rainfall in January: 1.85"

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 January
Charlestown, MD

Average rainfall days in January - Charlestown, MD
  • Average rainfall days in January: 7.8 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 January
Charlestown, MD

Average snowfall in January - Charlestown, MD
  • Average snowfall in January: 2.24"

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 January
Charlestown, MD

Average snowfall days in January - Charlestown, MD
  • Average snowfall days in January: 4.4 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 January
Charlestown, MD

Average sea temperature in January - Charlestown, MD
  • Average sea temperature in January: 42.4°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 January /
Average sunshine in January
Charlestown, MD

Average daylight in January / Average sunshine in January - Charlestown, MD
  • Average daylight in January: 9h and 5min

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 January: 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 January
Charlestown, MD

Average sunshine days in January - Charlestown, MD
  • Average sunshine days in January: 19.3 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 January
Charlestown, MD

Average UV index in January - Charlestown, 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, November and December (UV index 2).

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Average cloud cover in January
Charlestown, MD

Average cloud cover in January - Charlestown, MD
  • Average cloud cover in January: 44

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 January
Charlestown, MD

Average visibility in January - Charlestown, MD
  • Average visibility in January: 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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