December weather forecast and climate
Cedar Grove, NJ

December, the first month of the winter, in Cedar Grove, is still a cold month, with average temperature ranging between max 41.5°F (5.3°C) and min 31.1°F (-0.5°C).

Temperature

In Cedar Grove, New Jersey, the average high-temperature decreases, from a fresh 50.7°F (10.4°C) in November, to a cold 41.5°F (5.3°C). The average low-temperature, in Cedar Grove, is 31.1°F (-0.5°C).

Humidity

The average relative humidity in Cedar Grove is 77%.

Rainfall

In Cedar Grove, during December, the rain falls for 10.6 days and regularly aggregates up to 2.24" (57mm) of precipitation. Throughout the year, there are 153.3 rainfall days, and 24.92" (633mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall in Cedar Grove. In December, it is snowing for 3.6 days. Throughout December, 1.18" (30mm) of snow is accumulated. Throughout the year, there are 22.1 snowfall days, and 8.9" (226mm) of snow is accumulated.

Daylight

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

Sunshine

In December, 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 in Cedar Grove, New Jersey. A UV Index estimate of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Cedar Grove?

The average high-temperature, in December, in Cedar Grove, New Jersey, is 41.5°F (5.3°C), while the average low-temperature is 31.1°F (-0.5°C).

What is the average humidity in December in Cedar Grove?

The average relative humidity in December in Cedar Grove, New Jersey, is 77%.

How many days does it rain in December in Cedar Grove?

In December, in Cedar Grove, the rain falls for 10.6 days. Throughout December, 2.24" (57mm) of precipitation is accumulated.

How much does it snow in Cedar Grove in December?

In December, it is snowing for 3.6 days. Throughout December, 1.18" (30mm) of snow is accumulated.

What is the month with the shortest days in Cedar Grove?

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

How many hours of daylight does Cedar Grove have in December?

In Cedar Grove, New Jersey, the average length of the day in December is 9.3h.

How many hours of sunshine does Cedar Grove have in December?

In Cedar Grove, the average sunshine in December is 4.9h.

When is the lowest UV index in Cedar Grove?

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

What is the UV index intensity in December in Cedar Grove?

In Cedar Grove, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in December - Cedar Grove, NJ
  • Average high temperature in December: 5.3°C

The warmest month (with the highest average high temperature) is July (29°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 (-4.5°C).

Average pressure in December - Cedar Grove, 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 - Cedar Grove, NJ
  • Average wind speed in December: 13.1km/h

The windiest months (with the highest average wind speed) are January and March (14.1km/h).
The calmest month (with the lowest average wind speed) is July (9.2km/h).

Average humidity in December - Cedar Grove, NJ
  • Average humidity in December: 77%

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

Average rainfall in December - Cedar Grove, NJ
  • Average rainfall in December: 57mm

The wettest month (with the highest rainfall) is July (78mm).
The driest month (with the least rainfall) is January (35mm).

Average rainfall days in December - Cedar Grove, NJ
  • Average rainfall days in December: 10.6 days

The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (7.6 days).

Average snowfall in December - Cedar Grove, NJ
  • Average snowfall in December: 30mm

The month with the highest snowfall is March (83mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in December - Cedar Grove, NJ
  • Average snowfall days in December: 3.6 days

The month with the highest number of snowfall days is February (6.8 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December / Average sunshine in December - Cedar Grove, 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: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.7h).

Average sunshine days in December - Cedar Grove, NJ
  • Average sunshine days in December: 17.3 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (10.7 days).

Average UV index in December - Cedar Grove, 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 - Cedar Grove, 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 - Cedar Grove, NJ
  • Average visibility in December: 9km

Months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (9km).
The month with the lowest visibility is May (8km).