December weather forecast
Cologne, NJ

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Weather in December

The first month of the winter, December, is also a frosty month in Cologne, New Jersey, with an average temperature fluctuating between 36.5°F (2.5°C) and 46°F (7.8°C).

Temperature

With the onset of December, the average high-temperature subtly recedes from November's cool 54.1°F (12.3°C) to a frosty 46°F (7.8°C). The nighttime temperature, during December, averages of 36.5°F (2.5°C).

Humidity

In Cologne, the average relative humidity in December is 76%.

Rainfall

In December, the rain falls for 10.1 days. Throughout December, 2.8" (71mm) of precipitation is accumulated. In Cologne, during the entire year, the rain falls for 144.2 days and collects up to 27.48" (698mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Cologne, during December, snow falls for 2.1 days and regularly aggregates up to 0.94" (24mm) of snow. Throughout the year, in Cologne, there are 12.6 snowfall days, and 5.79" (147mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of December, sunrise is at 7:00 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:44 pm EST.

Sunshine

The average sunshine in December is 5.1h.

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In December, the UV index of 2 transforms into the following advice:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in December?

The high-temperature in Cologne during December is 46°F (7.8°C) and the low-temperature is 36.5°F (2.5°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines air temperature and relative humidity, in August is calculated to be 86°F (30°C).

What is the average humidity in December?

In Cologne, the average relative humidity in December is 76%.

How many days does it rain in December?

In Cologne, in December, during 10.1 rainfall days, 2.8" (71mm) of precipitation is typically accumulated.

How much does it snow in December?

In Cologne, during December, snow falls for 2.1 days and regularly aggregates up to 0.94" (24mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 26min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:00 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:44 pm EST.

How long on average sun shines in December?

In Cologne, New Jersey, the average sunshine duration in December is 5.1h.

What is the month with the lowest UV index?

The months with the lowest UV index are January, February and December, with an average maximum UV index of 2.

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health 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
Cologne, NJ

Average temperature in December - Cologne, NJ
  • Average high temperature in December: 46°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (39.7°F).

  • Average low temperature in December: 36.5°F

The month with the highest average low temperature is July (70.5°F).
The coldest month (with the lowest average low temperature) is January (29.7°F).

Average pressure in December
Cologne, NJ

Average pressure in December - Cologne, NJ
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Cologne, NJ

Average wind speed in December - Cologne, NJ
  • Average wind speed in December: 10.1mph

The windiest months (with the highest average wind speed) are January and February (10.6mph).
The calmest month (with the lowest average wind speed) is August (7.2mph).

Average humidity in December
Cologne, NJ

Average humidity in December - Cologne, NJ
  • Average humidity in December: 76%

The months with the highest relative humidity are May and June (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall in December
Cologne, NJ

Average rainfall in December - Cologne, NJ
  • Average rainfall in December: 2.8"

The wettest month (with the highest rainfall) is August (2.91").
The driest month (with the least rainfall) is January (1.61").

Average rainfall days in December
Cologne, NJ

Average rainfall days in December - Cologne, NJ
  • Average rainfall days in December: 10.1 days

The month with the highest number of rainy days is July (16.1 days).
The months with the least rainy days are January and November (8.3 days).

Average snowfall in December
Cologne, NJ

Average snowfall in December - Cologne, NJ
  • Average snowfall in December: 0.94"

The month with the highest snowfall is March (1.97").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Cologne, NJ

Average snowfall days in December - Cologne, NJ
  • Average snowfall days in December: 2.1 days

The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

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

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 5h and 1min

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 54min).

Average sunshine days in December
Cologne, NJ

Average sunshine days in December - Cologne, NJ
  • Average sunshine days in December: 19.2 days

The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is July (12.3 days).

Average UV index in December
Cologne, NJ

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

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

Average cloud cover in December
Cologne, NJ

Average cloud cover in December - Cologne, NJ
  • Average cloud cover in December: 45

The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 27).

Average visibility in December
Cologne, NJ

Average visibility in December - Cologne, 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).

Cologne, New Jersey, USA

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