December weather forecast
Hopatcong, NJ

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Weather in December

December, the first month of the winter in Hopatcong, is also a wintry month, with temperature in the range of an average high of 39.6°F (4.2°C) and an average low of 27.9°F (-2.3°C).

Temperature

The onset of December introduces a moderate change in Hopatcong's weather, with average high-temperatures falling from November's chilly 49.1°F (9.5°C) to a wintry 39.6°F (4.2°C). December nights are marked by an average temperature drop to a freezing cold 27.9°F (-2.3°C).

Humidity

February, October and December, with an average relative humidity of 81%, are the most humid months.

Rainfall

In Hopatcong, in December, it is raining for 11.5 days, with typically 2.95" (75mm) of accumulated precipitation. Throughout the year, there are 162.3 rainfall days, and 31.54" (801mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Hopatcong, during December, snow falls for 6 days and regularly aggregates up to 3.27" (83mm) of snow. Throughout the year, there are 36.2 snowfall days, and 19.61" (498mm) of snow is accumulated.

Daylight

The month with the shortest days in Hopatcong is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:40 pm EST.

Sunshine

The average sunshine in December is 4.7h.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum high daily UV index of 1 during December translates into the following directions:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Opt for tightly woven and loose clothing to enhance protection from the Sun. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

The average high-temperature and low-temperature during December are 39.6°F (4.2°C) and 27.9°F (-2.3°C) respectively. The average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is appraised at 86°F (30°C).

What is the most humid month?

February, October and December, with an average relative humidity of 81%, are most humid months in Hopatcong.

What is the average humidity in December?

In Hopatcong, the average relative humidity in December is 81%.

How many days does it rain in December?

In Hopatcong, in December, during 11.5 rainfall days, 2.95" (75mm) of precipitation is typically accumulated.

How much does it snow in December?

In December, it is snowing for 6 days. Throughout December, 3.27" (83mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 18min of daylight.

How many hours of daylight does Hopatcong have in December?

In December, the average day length is 9h and 17min.

When is the sunrise / sunset in December?

On the first day of December in Hopatcong, sunrise is at 7:04 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:40 pm EST.

How many hours of sunshine does Hopatcong have in December?

The average sunshine duration in December is 4.7h.

What is the month with the lowest UV index?

The month with the lowest UV index is December, with an average maximum UV index of 1.

What is the UV index reading in December?

The average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a low health threat from exposure to the Sun's UV radiation.
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
Hopatcong, NJ

Average temperature in December - Hopatcong, NJ
  • Average high temperature in December: 39.6°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 (33.4°F).

  • Average low temperature in December: 27.9°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

Average pressure in December
Hopatcong, NJ

Average pressure in December - Hopatcong, NJ
  • Average pressure in December: 30.08"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
Hopatcong, NJ

Average wind speed in December - Hopatcong, NJ
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).

Average humidity in December
Hopatcong, NJ

Average humidity in December - Hopatcong, NJ
  • Average humidity in December: 81%

The months with the highest relative humidity are February, October and December (81%).
The month with the lowest relative humidity is April (76%).

Average rainfall in December
Hopatcong, NJ

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

The wettest month (with the highest rainfall) is July (3.35").
The driest month (with the least rainfall) is September (1.65").

Average rainfall days in December
Hopatcong, NJ

Average rainfall days in December - Hopatcong, NJ
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.5 days).

Average snowfall in December
Hopatcong, NJ

Average snowfall in December - Hopatcong, NJ
  • Average snowfall in December: 3.27"

The month with the highest snowfall is February (4.61").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Hopatcong, NJ

Average snowfall days in December - Hopatcong, NJ
  • Average snowfall days in December: 6 days

The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Hopatcong, NJ
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 6min).
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 12min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).

Average sunshine days in December
Hopatcong, NJ

Average sunshine days in December - Hopatcong, NJ
  • Average sunshine days in December: 14.9 days

The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is June (10.9 days).

Average UV index in December
Hopatcong, NJ

Average UV index in December - Hopatcong, NJ
  • Average UV index in December: 1

The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Hopatcong, NJ

Average cloud cover in December - Hopatcong, NJ
  • Average cloud cover in December: 50

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).

Average visibility in December
Hopatcong, NJ

Average visibility in December - Hopatcong, NJ
  • Average visibility in December: 5mi

The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).

Hopatcong, New Jersey, USA

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