January weather forecast and climate
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, like December, in Washington, District of Columbia, is a wintry winter month, with temperature in the range of an average high of 40.6°F (4.8°C) and an average low of 27.5°F (-2.5°C).

Temperature

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

Humidity

The average relative humidity in Washington is 72%.

Rainfall

The month with the least rainfall in Washington is January when the rain falls for 9.3 days and typically collects 1.57" (40mm) of precipitation.

Snowfall

January through March and December are months with snowfall 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.

Daylight

The average length of the day in January is 9.8h.

Sunshine

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

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 2 in January transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Washington?

January 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).

What is the average humidity in January in Washington?

In January, the average relative humidity is 72%.

What is the driest month in Washington?

The month with the least rainfall is January when the rain falls for 9.3 days and typically collects 1.57" (40mm) of precipitation.

How many days does it rain in January in Washington?

In Washington, District of Columbia, in January, during 9.3 rainfall days, 1.57" (40mm) of precipitation is typically accumulated.

What is the snowiest month in Washington?

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

How many days does it snow in January in Washington?

In January, in Washington, it is snowing for 3.8 days. Throughout January, 2.17" (55mm) of snow is accumulated.

How many hours of daylight does Washington have in January?

The average length of the day in January in Washington, District of Columbia, is 9.8h.

What is the month with the least sunshine in Washington?

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

How long on average sun shines in January in Washington?

In Washington, District of Columbia, the average sunshine in January is 5.1h.

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

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

What is the UV index intensity in January in Washington?

In January, the average daily maximum UV index in Washington, District of Columbia, is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to the UV radiation.

Average temperature in January
Washington, DC

Average temperature in January - Washington, DC
  • Average high temperature in January: 4.8°C

The warmest month (with the highest average high temperature) is July (31.1°C).
The month with the lowest average high temperature is January (4.8°C).

  • Average low temperature in January: -2.5°C

The month with the highest average low temperature is July (20.6°C).
The coldest month (with the lowest average low temperature) is January (-2.5°C).

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Average pressure in January
Washington, DC

Average pressure in January - Washington, DC
  • Average pressure in January: 1019.5mbar

The month with the highest atmospheric pressure is November (1020.6mbar).
The month with the lowest atmospheric pressure is June (1014.1mbar).

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Average wind speed in January
Washington, DC

Average wind speed in January - Washington, DC
  • Average wind speed in January: 12.3km/h

The windiest month (with the highest average wind speed) is March (12.7km/h).
The calmest month (with the lowest average wind speed) is August (8.1km/h).

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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%).
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: 40mm

The wettest month (with the highest rainfall) is August (88mm).
The driest month (with the least rainfall) is January (40mm).

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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: 55mm

The month with the highest snowfall is January (55mm).
Months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

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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

Months with the highest number of snowfall days are January and February (3.8 days).
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: 9.8h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in January: 5.1h

The month with the most sunshine is July (Average sunshine: 10.7h).
Months with the least sunshine are January, February and December (Average sunshine: 5.1).

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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).
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: 9km

Months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (9km).
The month with the lowest visibility is May (8km).

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