Washington
District of Columbia, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Washington, DC

Stunning reflective view of rows of jacaranda trees in spring in the tidal basin of the Washington Monument in DC
Stunning reflective view of rows of jacaranda trees in spring in the tidal basin of the Washington Monument in DC
January, the same as December, is another cold winter month in Washington, District of Columbia, with average temperature ranging between min 27.5°F (-2.5°C) and max 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

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

Snowfall

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

Daylight

In Washington, District of Columbia, 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

Months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. 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 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.

What is the coldest month in Washington?

January is the coldest month, 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 temperature in January in Washington?

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

What is the average humidity in January in Washington?

In Washington, the average relative humidity in January is 72%.

How much does it rain in Washington in January?

In Washington, in January, it is raining for 9.3 days, with typically 1.57" (40mm) of accumulated precipitation.

What is the driest month in Washington?

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

How much does it snow in Washington in January?

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

When does it snow the most in Washington?

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

What is the average length of the day in January in Washington?

In January, the average length of the day 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 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, 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 Washington, District of Columbia, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to the UV radiation.
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).

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%).

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 lowest rainfall) is January (40mm).

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 lowest number of rainy days is November (8.1 days).

Average snowfall in January - Washington, DC
  • Average snowfall in January: 55mm

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

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 lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

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 shortest days is December (Average daylight: 9.5h).

  • Average sunshine in January: 5.1h

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

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).