Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The onset of December introduces a moderate change in Washington's weather, with average high-temperatures falling from November's chilly 49.8°F (9.9°C) to an icy 40.1°F (4.5°C). During the nights in December, an average low-temperature of 28.4°F (-2°C) is observed in Washington.Humidity
In December, the average relative humidity is 80%.Rainfall
In Washington, during December, the rain falls for 11.7 days and regularly aggregates up to 2.8" (71mm) of precipitation. In Washington, New Jersey, during the entire year, the rain falls for 157.6 days and collects up to 28.7" (729mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In December, in Washington, New Jersey, it is snowing for 4.9 days. Throughout December, 2.4" (61mm) of snow is accumulated. Throughout the year, there are 30.4 snowfall days, and 14.76" (375mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:05 am and sunset at 4:33 pm. On the last day of December, in Washington, New Jersey, sunrise is at 7:23 am and sunset at 4:42 pm EST.
Sunshine
In December, the average sunshine in Washington is 4.7h.UV index
The months with the lowest UV index in Washington are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In December, a regular UV index of 2 translates into these guidelines:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Frequently asked questions
How cold is it in Washington in December?
What is the average humidity in December in Washington?
How much does it rain in Washington in December?
How many days does it snow in December in Washington?
What is the month with the shortest days in Washington?
What is the average length of the day in December in Washington?
When are sunrise and sunset in December in Washington?
How many hours of sunshine does Washington have in December?
What is the month with the lowest UV index in Washington?
How high is the UV index in December in Washington?
Average temperature in December
Washington, NJ
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in December: 28.4°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in December
Washington, NJ
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Washington, NJ
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Washington, NJ
- Average humidity in December: 80%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Washington, NJ
- Average rainfall in December: 2.8"
The wettest month (with the highest rainfall) is July (2.87").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in December
Washington, NJ
- Average rainfall days in December: 11.7 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is January (8.1 days).
Average snowfall in December
Washington, NJ
- Average snowfall in December: 2.4"
The month with the highest snowfall is February (3.82").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Washington, NJ
- Average snowfall days in December: 4.9 days
The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Washington, NJ
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Washington, NJ
- Average sunshine days in December: 16 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is April (11.8 days).
Average UV index in December
Washington, NJ
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Washington, NJ
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Washington, NJ
- Average visibility in December: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
Washington, New Jersey, USA
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