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

December 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, USA
Stunning reflective view of rows of jacaranda trees in spring in the tidal basin of the Washington monument in DC, USA
December is a cold winter month with average lows dropping to 32°F (0°C). The weather is unpredictable, with sunny days interspersed between intense cold days.
Daily average high is cold 46°F (7.8°C), but sometimes cold waves and winds resemble glacially chilly conditions.
Many art and theater establishments entertain enthusiastic souls inside their premises, and Washington, D.C. is home to more than a hundred historical sites and museums that may keep a tight budget visitor occupied in winter.
  • Average high temperature in December: 46.8°F

The warmest month (with the highest average high temperature) is July (88.4°F).
The month with the lowest average high temperature is January (43.4°F).

  • Average low temperature in December: 32.5°F

The month with the highest average low temperature is July (71.1°F).
The coldest month (with the lowest average low temperature) is January (28.6°F).

  • Average humidity in December: 64.1%

The month with the highest relative humidity is September (69.7%).
The month with the lowest relative humidity is April (58%).

  • Average rainfall in December: 3.1"

The wettest month (with the highest rainfall) is May (4").
The driest month (with the lowest rainfall) is February (2.6").

  • Average rainfall days in December: 9.7 days

The month with the highest number of rainy days is May (11.1 days).
The month with the lowest number of rainy days is October (7.7 days).

  • Average snowfall in December: 2.3"

The month with the highest snowfall is February (5.7").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

  • Average snowfall days in December: 1.5 days

The month with the highest number of snowfall days is January (3 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

  • Average daylight in December: 9.5h

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 December: 4.3h

The month with most sunshine is June (Average sunshine: 9.4h).
The month with least sunshine is December (Average sunshine: 4.3h).

  • Average UV index in December: 2

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 2).

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