December weather forecast
Jamesburg, NJ

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Weather in December

The first month of the winter, December, is also a frosty month in Jamesburg, New Jersey, with temperature in the range of an average high of 43.2°F (6.2°C) and an average low of 32.7°F (0.4°C).

Temperature

With the arrival of December, Jamesburg experiences a modest decline in average high-temperatures, transitioning from a fresh 52°F (11.1°C) in November to a frosty 43.2°F (6.2°C). The nights of December anticipate an average low-temperature of 32.7°F (0.4°C).

Humidity

February, May, October and December, with an average relative humidity of 77%, are the most humid months.

Rainfall

In Jamesburg, during December, the rain falls for 6.5 days and regularly aggregates up to 0.79" (20mm) of precipitation. In Jamesburg, during the entire year, the rain falls for 92.9 days and collects up to 7.32" (186mm) of precipitation.

Snowfall

Months with snowfall are January through March, November and December. In December, it is snowing for 2.2 days. Throughout December, 0.35" (9mm) of snow is accumulated. In Jamesburg, New Jersey, during the entire year, snow falls for 12.7 days and aggregates up to 1.5" (38mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:02 am and sunset at 4:32 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:41 pm EST.

Sunshine

The average sunshine in December in Jamesburg 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 Jamesburg. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for average individuals.
Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.

Frequently asked questions

Is it cold during December?

The high-temperature, in December, in Jamesburg, is 43.2°F (6.2°C), while the low-temperature averages to 32.7°F (0.4°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is appraised at 87.8°F (31°C).

What is the most humid month?

February, May, October and December, with an average relative humidity of 77%, are most humid months.

What is the average humidity in December?

In December, the average relative humidity is 77%.

How much does it rain in Jamesburg in December?

In Jamesburg, in December, it is raining for 6.5 days, with typically 0.79" (20mm) of accumulated precipitation.

How many days does it snow in December?

In Jamesburg, during December, snow falls for 2.2 days and regularly aggregates up to 0.35" (9mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

In December, the average day length is 9h and 21min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:02 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:41 pm EST.

How long on average sun shines in December?

In Jamesburg, the average sunshine duration in December is 4.9h.

What are the months with the lowest UV index in Jamesburg?

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

What is the UV index reading in December?

In Jamesburg, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.
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
Jamesburg, NJ

Average temperature in December - Jamesburg, NJ
  • Average high temperature in December: 43.2°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in December: 32.7°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (25°F).

Average pressure in December
Jamesburg, NJ

Average pressure in December - Jamesburg, 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
Jamesburg, NJ

Average wind speed in December - Jamesburg, NJ
  • Average wind speed in December: 8.5mph

The windiest month (with the highest average wind speed) is March (9.3mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

Average humidity in December
Jamesburg, NJ

Average humidity in December - Jamesburg, NJ
  • Average humidity in December: 77%

The months with the highest relative humidity are February, May, October and December (77%).
The months with the lowest relative humidity are April and August (73%).

Average rainfall in December
Jamesburg, NJ

Average rainfall in December - Jamesburg, NJ
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is July (0.94").
The driest month (with the least rainfall) is September (0.28").

Average rainfall days in December
Jamesburg, NJ

Average rainfall days in December - Jamesburg, NJ
  • Average rainfall days in December: 6.5 days

The month with the highest number of rainy days is July (10.7 days).
The months with the least rainy days are January and November (4.8 days).

Average snowfall in December
Jamesburg, NJ

Average snowfall in December - Jamesburg, NJ
  • Average snowfall in December: 0.35"

The month with the highest snowfall is March (0.51").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Jamesburg, NJ

Average snowfall days in December - Jamesburg, NJ
  • Average snowfall days in December: 2.2 days

The month with the highest number of snowfall days is February (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
Jamesburg, NJ

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

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in December
Jamesburg, NJ

Average sunshine days in December - Jamesburg, NJ
  • Average sunshine days in December: 23 days

The month with the most sunshine days is January (24.2 days).
The month with the least sunshine days is July (15.7 days).

Average UV index in December
Jamesburg, NJ

Average UV index in December - Jamesburg, 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, March, November and December (UV index 2).

Average cloud cover in December
Jamesburg, NJ

Average cloud cover in December - Jamesburg, NJ
  • Average cloud cover in December: 48

The months with the most cloud cover are February, March and December (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 32).

Average visibility in December
Jamesburg, NJ

Average visibility in December - Jamesburg, 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).

Jamesburg, New Jersey, USA

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