January weather forecast
Washington, DC

Rows of jacaranda trees in spring in the tidal basin of the Washington Monument in Washington city, DC, USA
Rows of jacaranda trees in spring in the tidal basin of the Washington Monument in Washington city, DC, USA

Weather in January

January, the same as December, is a wintry winter month in Washington, District of Columbia, with an average temperature varying between 27.5°F (-2.5°C) and 40.6°F (4.8°C).

Temperature

With an average high-temperature of 40.6°F (4.8°C) and an average low-temperature of 27.5°F (-2.5°C), January is the coldest month.

Humidity

The average relative humidity in January is 72%.

Rainfall

January is the month with the least rainfall in Washington. Rain falls for 9.3 days and accumulates 1.57" (40mm) of precipitation.

Snowfall

Months with snowfall in Washington are January through March and December. The month with the most snowfall is January, when snow falls for 3.8 days and typically aggregates up to 2.17" (55mm) of snow.

Daylight

The average length of the day in January in Washington is 9h and 49min.
On the first day of January in Washington, sunrise is at 7:26 am and sunset at 4:56 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 5:28 pm EST.

Sunshine

January, February and December, with an average of 5.1h of sunshine, are months with the least sunshine.

UV index

January 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 exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. 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 the 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.
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FAQ

What is the coldest month in Washington?

With an average high-temperature of 40.6°F (4.8°C) and an average low-temperature of 27.5°F (-2.5°C), January is the coldest month in Washington, District of Columbia.

What is the average humidity in January in Washington?

The average relative humidity in January in Washington is 72%.

What is the driest month in Washington?

January is the month with the least rainfall in Washington, District of Columbia. Rain falls for 9.3 days and accumulates 1.57" (40mm) of precipitation.

How much does it rain in Washington in January?

In January, in Washington, District of Columbia, the rain falls for 9.3 days. Throughout January, 1.57" (40mm) of precipitation is accumulated.

What is the snowiest month in Washington?

January is the month with the most snowfall in Washington. Snow falls for 3.8 days and accumulates 2.17" (55mm) of snow.

How much does it snow in Washington in January?

In Washington, District of Columbia, during January, snow falls for 3.8 days and regularly aggregates up to 2.17" (55mm) of snow.

How many hours of daylight does Washington have in January?

In Washington, the average day length in January is 9h and 49min.

What time are sunrise and sunset in January in Washington?

In January, on the first day of the month, sunrise is at 7:26 am and sunset at 4:56 pm. On the last day of the month, in Washington, sunrise is at 7:14 am and sunset at 5:28 pm EST.

What is the month with the least sunshine in Washington?

The months with the least sunshine in Washington, District of Columbia, are January, February and December, with an average of 5.1h of sunshine.

How many hours of sunshine does Washington have in January?

The average sunshine duration in January in Washington, District of Columbia, is 5.1h.

When is the lowest UV index in Washington?

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

What is the UV index reading in January in Washington?

In Washington, the average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Washington, DC

Average temperature in January - Washington, DC
  • Average high temperature in January: 40.6°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.6°F).

  • Average low temperature in January: 27.5°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (27.5°F).

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Average pressure in January
Washington, DC

Average pressure in January - Washington, DC
  • Average pressure in January: 30.11"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

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Average wind speed in January
Washington, DC

Average wind speed in January - Washington, DC
  • Average wind speed in January: 7.6mph

The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in January
Washington, DC

Average humidity in January - Washington, DC
  • Average humidity in January: 72%

The month with the highest relative humidity is May (76%).
The months with the lowest relative humidity are April and July (71%).

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Average rainfall in January
Washington, DC

Average rainfall in January - Washington, DC
  • Average rainfall in January: 1.57"

The wettest month (with the highest rainfall) is August (3.46").
The driest month (with the least rainfall) is January (1.57").

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Average rainfall days in January
Washington, DC

Average rainfall days in January - Washington, DC
  • Average rainfall days in January: 9.3 days

The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is November (8.1 days).

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Average snowfall in January
Washington, DC

Average snowfall in January - Washington, DC
  • Average snowfall in January: 2.17"

The month with the highest snowfall is January (2.17").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in January
Washington, DC

Average snowfall days in January - Washington, DC
  • Average snowfall days in January: 3.8 days

The months with the highest number of snowfall days are January and February (3.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in January /
Average sunshine in January
Washington, DC

Average daylight in January / Average sunshine in January - Washington, DC
  • Average daylight in January: 9h and 49min

The month with the longest days is June (Average daylight: 14h and 51min).
The month with the shortest days is December (Average daylight: 9h and 29min).

  • Average sunshine in January: 5h and 6min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).

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Average sunshine days in January
Washington, DC

Average sunshine days in January - Washington, DC
  • Average sunshine days in January: 18.2 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (12.8 days).

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Average UV index in January
Washington, DC

Average UV index in January - Washington, DC
  • Average UV index in January: 2

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in January
Washington, DC

Average cloud cover in January - Washington, DC
  • Average cloud cover in January: 43

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in January
Washington, DC

Average visibility in January - Washington, DC
  • Average visibility in January: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

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