December weather forecast
Harrison, NJ

Weather in December

The first month of the winter, December, is still a cold month in Harrison, New Jersey, with temperature in the range of an average low of 32.9°F (0.5°C) and an average high of 41.9°F (5.5°C).

Temperature

In December, the average high-temperature decreases from a cool 50.9°F (10.5°C) in November to a cold 41.9°F (5.5°C). In Harrison, the average low-temperature is 32.9°F (0.5°C).

Humidity

February and December, with an average relative humidity of 75%, are the most humid months.

Rainfall

In Harrison, New Jersey, during December, the rain falls for 11.6 days and regularly aggregates up to 2.95" (75mm) of precipitation. Throughout the year, in Harrison, there are 150.3 rainfall days, and 27.72" (704mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Harrison are January through April, November and December. In Harrison, New Jersey, in December, during 2.5 snowfall days, 1.5" (38mm) of snow is typically accumulated. In Harrison, during the entire year, snow falls for 18.1 days and aggregates up to 8.46" (215mm) of snow.

Daylight

The month with the shortest days in Harrison is December, with an average of 9h and 19min of daylight.
On the first day of December in Harrison, sunrise is at 7:01 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:38 pm EST.

Sunshine

The average sunshine in December is 4.9h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The average daily UV index of 2 in December 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 the 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 temperature in December in Harrison?

The average high-temperature, in December, is 41.9°F (5.5°C), while the average low-temperature is 32.9°F (0.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in August is evaluated at 86°F (30°C).

What are the most humid months in Harrison?

The months with the highest humidity in Harrison, New Jersey, are February and December, with an average relative humidity of 75%.

What is the average humidity in December in Harrison?

In Harrison, New Jersey, the average relative humidity in December is 75%.

How many days does it rain in December in Harrison?

In Harrison, New Jersey, in December, during 11.6 rainfall days, 2.95" (75mm) of precipitation is typically accumulated.

How much does it snow in Harrison in December?

In December, in Harrison, it is snowing for 2.5 days. Throughout December, 1.5" (38mm) of snow is accumulated.

What is the month with the shortest days in Harrison?

With an average of 9h and 19min of daylight, December has the shortest days of the year.

What is the average length of the day in December in Harrison?

The average day length in December in Harrison is 9h and 19min.

When are sunrise and sunset in December in Harrison?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 4:30 pm. On the last day of the month, in Harrison, sunrise is at 7:20 am and sunset at 4:38 pm EST.

How long on average sun shines in December in Harrison?

In Harrison, New Jersey, the average sunshine duration in December is 4.9h.

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

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Harrison, New Jersey.

How high is the UV index in December in Harrison?

The average daily maximum UV index in December in Harrison, New Jersey, is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Harrison, NJ

Average temperature in December - Harrison, NJ
  • Average high temperature in December: 41.9°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (36.3°F).

  • Average low temperature in December: 32.9°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).

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Average pressure in December
Harrison, NJ

Average pressure in December - Harrison, NJ
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
Harrison, NJ

Average wind speed in December - Harrison, NJ
  • Average wind speed in December: 9.4mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

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Average humidity in December
Harrison, NJ

Average humidity in December - Harrison, NJ
  • Average humidity in December: 75%

The months with the highest relative humidity are February and December (75%).
The month with the lowest relative humidity is August (70%).

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Average rainfall in December
Harrison, NJ

Average rainfall in December - Harrison, NJ
  • Average rainfall in December: 2.95"

The wettest month (with the highest rainfall) is July (3.23").
The driest months (with the least rainfall) are January and February (1.69").

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Average rainfall days in December
Harrison, NJ

Average rainfall days in December - Harrison, NJ
  • Average rainfall days in December: 11.6 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (7.3 days).

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Average snowfall in December
Harrison, NJ

Average snowfall in December - Harrison, NJ
  • Average snowfall in December: 1.5"

The month with the highest snowfall is March (2.8").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Harrison, NJ

Average snowfall days in December - Harrison, NJ
  • Average snowfall days in December: 2.5 days

The months with the highest number of snowfall days are January and February (5.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Harrison, NJ

Average daylight in December / Average sunshine in December - Harrison, 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 5min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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Average sunshine days in December
Harrison, NJ

Average sunshine days in December - Harrison, NJ
  • Average sunshine days in December: 17.5 days

The month with the most sunshine days is January (19.6 days).
The month with the least sunshine days is July (12 days).

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Average UV index in December
Harrison, NJ

Average UV index in December - Harrison, NJ
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in December
Harrison, NJ

Average cloud cover in December - Harrison, NJ
  • Average cloud cover in December: 47

The months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in December
Harrison, NJ

Average visibility in December - Harrison, NJ
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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