December weather forecast
Upper Saddle River, NJ

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Weather in December

The first month of the winter, December, is also a wintry month in Upper Saddle River, New Jersey, with an average temperature varying between 30.4°F (-0.9°C) and 40.8°F (4.9°C).

Temperature

With the onset of December, Upper Saddle River's average high-temperature adjusts, receding from November's cool 50.7°F (10.4°C) to an icy 40.8°F (4.9°C). Throughout December, Upper Saddle River's nights cool down to an average of 30.4°F (-0.9°C).

Humidity

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

Rainfall

The month with the most rainfall is December, when the rain falls for 10.6 days and typically aggregates up to 3.58" (91mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. In December, it is snowing for 4.5 days. Throughout December, 2.05" (52mm) of snow is accumulated. In Upper Saddle River, during the entire year, snow falls for 28 days and aggregates up to 13.82" (351mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:02 am and sunset at 4:28 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:38 pm EST.

Sunshine

The average sunshine in December is 4.7h.

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 of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 2 in December converts into the following recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.

Frequently asked questions

Is December cold in Upper Saddle River?

The high-temperature, in December, in Upper Saddle River, is 40.8°F (4.9°C), while the low-temperature averages to 30.4°F (-0.9°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 87.8°F (31°C).

What are the most humid months?

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

What is the average humidity in December?

In December, the average relative humidity is 78%.

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 10.6 days and accumulates 3.58" (91mm) of precipitation.

How much does it rain in Upper Saddle River in December?

In Upper Saddle River, in December, during 10.6 rainfall days, 3.58" (91mm) of precipitation is typically accumulated.

How much does it snow in Upper Saddle River in December?

In Upper Saddle River, in December, during 4.5 snowfall days, 2.05" (52mm) of snow is typically accumulated.

What is the month with the shortest days in Upper Saddle River?

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

How many hours of daylight does Upper Saddle River have in December?

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

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:28 pm. On the last day of the month, in Upper Saddle River, sunrise is at 7:21 am and sunset at 4:38 pm EST.

How many hours of sunshine does Upper Saddle River have in December?

The average sunshine duration in December is 4.7h.

What are the months with the lowest UV index?

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

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to 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
Upper Saddle River, NJ

Average temperature in December - Upper Saddle River, NJ
  • Average high temperature in December: 40.8°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in December: 30.4°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).

Average pressure in December
Upper Saddle River, NJ

Average pressure in December - Upper Saddle River, 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).

Average wind speed in December
Upper Saddle River, NJ

Average wind speed in December - Upper Saddle River, NJ
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Upper Saddle River, NJ

Average humidity in December - Upper Saddle River, NJ
  • Average humidity in December: 78%

The months with the highest relative humidity are February and December (78%).
The month with the lowest relative humidity is August (70%).

Average rainfall in December
Upper Saddle River, NJ

Average rainfall in December - Upper Saddle River, NJ
  • Average rainfall in December: 3.58"

The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is September (1.89").

Average rainfall days in December
Upper Saddle River, NJ

Average rainfall days in December - Upper Saddle River, NJ
  • Average rainfall days in December: 10.6 days

The months with the highest number of rainy days are May and July (16.8 days).
The month with the least rainy days is January (8.4 days).

Average snowfall in December
Upper Saddle River, NJ

Average snowfall in December - Upper Saddle River, NJ
  • Average snowfall in December: 2.05"

The month with the highest snowfall is February (4.09").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Upper Saddle River, NJ

Average snowfall days in December - Upper Saddle River, NJ
  • Average snowfall days in December: 4.5 days

The month with the highest number of snowfall days is February (7.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Upper Saddle River, NJ

Average daylight in December / Average sunshine in December - Upper Saddle River, 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 30min).

Average sunshine days in December
Upper Saddle River, NJ

Average sunshine days in December - Upper Saddle River, NJ
  • Average sunshine days in December: 16.7 days

The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is June (11.5 days).

Average UV index in December
Upper Saddle River, NJ

Average UV index in December - Upper Saddle River, 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).

Average cloud cover in December
Upper Saddle River, NJ

Average cloud cover in December - Upper Saddle River, NJ
  • Average cloud cover in December: 49

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).

Average visibility in December
Upper Saddle River, NJ

Average visibility in December - Upper Saddle River, NJ
  • Average visibility in December: 6mi

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

Upper Saddle River, New Jersey, USA

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