December weather forecast
New Haven, CT

The greeny New Haven Green in Connecticut, with the rest of the city and a far away dramatic landscape
The greeny New Haven Green in Connecticut, with the rest of the city and a far away dramatic landscape

Weather in December

December, the first month of the winter in New Haven, is still a cold month, with an average temperature fluctuating between 41.7°F (5.4°C) and 32.5°F (0.3°C).

Temperature

In December, the average high-temperature drops from a cool 50.7°F (10.4°C) in November to a cold 41.7°F (5.4°C). In December, in New Haven, the average low-temperature is 32.5°F (0.3°C).

Humidity

In New Haven, the average relative humidity in December is 75%.

Rainfall

The month with the most rainfall in New Haven is December, when the rain falls for 12.5 days and typically aggregates up to 3.86" (98mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In New Haven, during December, snow falls for 3.5 days and regularly aggregates up to 1.34" (34mm) of snow. Throughout the year, there are 23.1 snowfall days, and 9.21" (234mm) of snow is accumulated.

Ocean temperature

In New Haven, the average water temperature is 48.7°F (9.3°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

The month with the shortest days in New Haven is December, with an average of 9h and 15min of daylight.
On the first day of the month, sunrise is at 6:57 am and sunset at 4:23 pm. On the last day of December, in New Haven, sunrise is at 7:17 am and sunset at 4:32 pm EST.

Sunshine

In December, the average sunshine 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 in New Haven. 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: The daily maximum UV index of 2 in December interpret into the following advice:
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 the 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in New Haven?

In New Haven, in December, the average high-temperature is 41.7°F (5.4°C), and the average low-temperature is 32.5°F (0.3°C).

What is the average humidity in December in New Haven?

In December, the average relative humidity in New Haven, Connecticut, is 75%.

What is the wettest month in New Haven?

The month with the most rainfall in New Haven is December, when the rain falls for 12.5 days and typically aggregates up to 3.86" (98mm) of precipitation.

How many days does it rain in December in New Haven?

In New Haven, Connecticut, in December, during 12.5 rainfall days, 3.86" (98mm) of precipitation is typically accumulated.

How much does it snow in New Haven in December?

In New Haven, Connecticut, during December, snow falls for 3.5 days and regularly aggregates up to 1.34" (34mm) of snow.

How cold is the water in December in New Haven?

In New Haven, in December, the average water temperature is 48.7°F (9.3°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in New Haven?

December has the shortest days of the year, with an average of 9h and 15min of daylight.

What is the average length of the day in December in New Haven?

The average day length in December is 9h and 15min.

When is the sunrise / sunset in December in New Haven?

In December, on the first day of the month, sunrise is at 6:57 am and sunset at 4:23 pm. On the last day of the month, in New Haven, sunrise is at 7:17 am and sunset at 4:32 pm EST.

How long on average sun shines in December in New Haven?

The average sunshine duration in December is 4.8h.

When is the lowest UV index in New Haven?

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 New Haven?

In New Haven, Connecticut, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents 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
New Haven, CT

Average temperature in December - New Haven, CT
  • Average high temperature in December: 41.7°F

The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in December: 32.5°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25.5°F).

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Average pressure in December
New Haven, CT

Average pressure in December - New Haven, CT
  • Average pressure in December: 30.06"Hg

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
New Haven, CT

Average wind speed in December - New Haven, CT
  • Average wind speed in December: 10.2mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

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Average humidity in December
New Haven, CT

Average humidity in December - New Haven, CT
  • Average humidity in December: 75%

The months with the highest relative humidity are February, May and June (76%).
The months with the lowest relative humidity are April and November (72%).

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Average rainfall in December
New Haven, CT

Average rainfall in December - New Haven, CT
  • Average rainfall in December: 3.86"

The wettest month (with the highest rainfall) is December (3.86").
The driest month (with the least rainfall) is September (2.24").

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Average rainfall days in December
New Haven, CT

Average rainfall days in December - New Haven, CT
  • Average rainfall days in December: 12.5 days

The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is January (9.4 days).

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Average snowfall in December
New Haven, CT

Average snowfall in December - New Haven, CT
  • Average snowfall in December: 1.34"

The month with the highest snowfall is March (2.8").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
New Haven, CT

Average snowfall days in December - New Haven, CT
  • Average snowfall days in December: 3.5 days

The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in December
New Haven, CT

Average sea temperature in December - New Haven, CT
  • Average sea temperature in December: 48.7°F

The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is February (38.5°F).

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Average daylight in December /
Average sunshine in December
New Haven, CT

Average daylight in December / Average sunshine in December - New Haven, CT
  • Average daylight in December: 9h and 15min

The month with the longest days is June (Average daylight: 15h and 7min).
The month with the shortest days is December (Average daylight: 9h and 15min).

  • Average sunshine in December: 4h and 48min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in December
New Haven, CT

Average sunshine days in December - New Haven, CT
  • Average sunshine days in December: 15.4 days

The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is August (11.3 days).

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Average UV index in December
New Haven, CT

Average UV index in December - New Haven, CT
  • 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).

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Average cloud cover in December
New Haven, CT

Average cloud cover in December - New Haven, CT
  • Average cloud cover in December: 48

The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in December
New Haven, CT

Average visibility in December - New Haven, CT
  • 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).

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