Weather in December in Washington, District Of Columbia

• The average sea tempeature is 5 °C (41 °F).
• The average temperature in Washington, District Of Columbia in December is cool at 4.1 °C (39.38 °F).
• Afternoons can be a little cool with average high temperatures reaching 8.3 °C (46.9 °F).
• Overnight temperatures are generally slightly cold with an average low of -0.2 °C (31.6 °F).
• In December there is a range/ variation of diurnal average temperatures of 8.5 °C (15.3 °F).
• Precipitation averages for December are moderate with 79.2mm (3.1 in) recorded across 10 days.
• The heavens above Washington, District Of Columbia are slightly fair with on balance a modest 4h 38' of blazing sunlight daily.
• The shortest day is 9h 25' long and the longest day is 9h 37' long with an average length of 9h 29'.
• There are approximately 4h 40' per day when the sun is occluded by cloud, haze, fog etc.
• It is sunny approximately 49.8% of daylight hours and cloudy 50.2% of daylight hours.

Weather Trend Graph for December in Washington, District Of Columbia, Usa