December weather forecast and climate
Edison, NJ

December, the first month of the winter, in Edison, is still a cold month, with temperature in the range of an average low of 32.5°F (0.3°C) and an average high of 42.6°F (5.9°C).

Temperature

In Edison, the average high-temperature in December decreases, from a cool 52°F (11.1°C) in November, to a wintry 42.6°F (5.9°C). In Edison, in December, the average low-temperature is 32.5°F (0.3°C).

Humidity

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

Rainfall

In Edison, during December, the rain falls for 10.2 days and regularly aggregates up to 2.64" (67mm) of precipitation. In Edison, during the entire year, the rain falls for 149.9 days and collects up to 26.93" (684mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Edison, snow falls for 3.2 days, with typically accumulated 0.94" (24mm) of snow. In Edison, during the entire year, snow falls for 18.6 days, and aggregates up to 7.64" (194mm) of snow.

Daylight

With an average of 9.3h of daylight, December has the shortest days of the year in Edison, New Jersey.

Sunshine

The average sunshine in Edison is 4.8h.

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 estimate of 2, and below, represents a low threat to health from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 2 in December transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to 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. 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 Edison?

In December, the average high-temperature is 42.6°F (5.9°C), and the average low-temperature is 32.5°F (0.3°C).

What are the most humid months in Edison?

Months with the highest humidity in Edison, New Jersey, are February, October and December, with an average relative humidity of 77%.

What is the average humidity in December in Edison?

In Edison, New Jersey, the average relative humidity in December is 77%.

How much does it rain in Edison in December?

In December, in Edison, New Jersey, the rain falls for 10.2 days. Throughout December, 2.64" (67mm) of precipitation is accumulated.

How many days does it snow in December in Edison?

In December, in Edison, it is snowing for 3.2 days. Throughout December, 0.94" (24mm) of snow is accumulated.

What is the month with the shortest days in Edison?

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

How many hours of daylight does Edison have in December?

The average length of the day in December is 9.3h.

How long on average sun shines in December in Edison?

The average sunshine in December is 4.8h.

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

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 Edison?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in December - Edison, NJ
  • Average high temperature in December: 5.9°C

The warmest month (with the highest average high temperature) is July (28.9°C).
The month with the lowest average high temperature is January (2.6°C).

  • Average low temperature in December: 0.3°C

The month with the highest average low temperature is July (20.1°C).
The coldest month (with the lowest average low temperature) is January (-3.9°C).

Average pressure in December - Edison, NJ
  • Average pressure in December: 1018.6mbar

The month with the highest atmospheric pressure is November (1019.6mbar).
The month with the lowest atmospheric pressure is June (1013.7mbar).

Average wind speed in December - Edison, NJ
  • Average wind speed in December: 13.7km/h

The windiest month (with the highest average wind speed) is March (14.9km/h).
The calmest months (with the lowest average wind speed) are July and August (9.7km/h).

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

Months with the highest relative humidity are February, October and December (77%).
The month with the lowest relative humidity is August (72%).

Average rainfall in December - Edison, NJ
  • Average rainfall in December: 67mm

The wettest month (with the highest rainfall) is July (78mm).
The driest month (with the least rainfall) is September (39mm).

Average rainfall days in December - Edison, NJ
  • Average rainfall days in December: 10.2 days

The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in December - Edison, NJ
  • Average snowfall in December: 24mm

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 - Edison, NJ
  • Average snowfall days in December: 3.2 days

The month with the highest number of snowfall days is January (5.6 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 - Edison, NJ
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 4.8h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is February (Average sunshine: 4.6h).

Average sunshine days in December - Edison, NJ
  • Average sunshine days in December: 18.2 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.3 days).

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

Months with the highest UV index are May, 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 - Edison, NJ
  • Average cloud cover in December: 49

Months with the most cloud cover are February and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December - Edison, 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).