December weather forecast and climate
West Orange, NJ

The first month of the winter, December, is still a cold month in West Orange, New Jersey, with average temperature varying between 41.7°F (5.4°C) and 31.1°F (-0.5°C).

Temperature

In West Orange, the average high-temperature drops, from a cool 50.7°F (10.4°C) in November, to a wintry 41.7°F (5.4°C). In West Orange, in December, the average low-temperature is 31.1°F (-0.5°C).

Humidity

February and December, with an average relative humidity of 78%, are most humid months in West Orange.

Rainfall

In West Orange, during December, the rain falls for 9.5 days and regularly aggregates up to 1.26" (32mm) of precipitation. Throughout the year, in West Orange, there are 127.3 rainfall days, and 12.68" (322mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. In West Orange, in December, snow falls for 3.3 days, with typically accumulated 0.55" (14mm) of snow. Throughout the year, there are 19 snowfall days, and 3.7" (94mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9.3h of daylight.

Sunshine

In West Orange, the average sunshine is 4.9h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 2 in December transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in West Orange?

In December, in West Orange, New Jersey, the average high-temperature is 41.7°F (5.4°C), and the average low-temperature is 31.1°F (-0.5°C).

What are the most humid months in West Orange?

Months with the highest humidity in West Orange, New Jersey, are February and December, with an average relative humidity of 78%.

What is the average humidity in December in West Orange?

The average relative humidity in December is 78%.

How many days does it rain in December in West Orange?

In December, the rain falls for 9.5 days. Throughout December, 1.26" (32mm) of precipitation is accumulated.

How much does it snow in West Orange in December?

In West Orange, in December, during 3.3 snowfall days, 0.55" (14mm) of snow is typically accumulated.

What is the month with the shortest days in West Orange?

The month with the shortest days is December, with an average of 9.3h of daylight.

What is the average length of the day in December in West Orange?

In December, the average length of the day in West Orange is 9.3h.

How long on average sun shines in December in West Orange?

In December, the average sunshine in West Orange is 4.9h.

What are the months with the lowest UV index in West Orange?

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

What is the UV index reading in December in West Orange?

The average daily maximum UV index in December in West Orange is 2. A UV Index value of 2, and less, symbolizes a low health threat from unsafe exposure to the Sun's UV rays.
Average temperature in December - West Orange, NJ
  • Average high temperature in December: 5.4°C

The warmest month (with the highest average high temperature) is July (28.7°C).
The month with the lowest average high temperature is January (1.8°C).

  • Average low temperature in December: -0.5°C

The month with the highest average low temperature is July (19.8°C).
The coldest month (with the lowest average low temperature) is January (-4.6°C).

Average pressure in December - West Orange, NJ
  • Average pressure in December: 1018.5mbar

The month with the highest atmospheric pressure is November (1019.5mbar).
The month with the lowest atmospheric pressure is June (1013.6mbar).

Average wind speed in December - West Orange, NJ
  • Average wind speed in December: 13.3km/h

The windiest month (with the highest average wind speed) is January (14.3km/h).
The calmest months (with the lowest average wind speed) are July and August (9.3km/h).

Average humidity in December - West Orange, NJ
  • Average humidity in December: 78%

Months with the highest relative humidity are February and December (78%).
Months with the lowest relative humidity are April and August (72%).

Average rainfall in December - West Orange, NJ
  • Average rainfall in December: 32mm

The wettest month (with the highest rainfall) is July (41mm).
The driest month (with the least rainfall) is January (17mm).

Average rainfall days in December - West Orange, NJ
  • Average rainfall days in December: 9.5 days

The month with the highest number of rainy days is July (15.5 days).
The month with the least rainy days is January (6.1 days).

Average snowfall in December - West Orange, NJ
  • Average snowfall in December: 14mm

The month with the highest snowfall is March (31mm).
Months with the least snowfall are May, June, July, August and September (0mm).

Average snowfall days in December - West Orange, NJ
  • Average snowfall days in December: 3.3 days

The month with the highest number of snowfall days is February (5.5 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - West Orange, NJ
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 4.9h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.7h).

Average sunshine days in December - West Orange, NJ
  • Average sunshine days in December: 18.5 days

The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is July (12.5 days).

Average UV index in December - West Orange, NJ
  • Average UV index in December: 2

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

Average cloud cover in December - West Orange, NJ
  • Average cloud cover in December: 47

Months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 31).

Average visibility in December - West Orange, NJ
  • Average visibility in December: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).