Nantucket
Massachusetts, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Nantucket, MA

Beautiful homes built on the water overlooking the boats on the water below, in Nantucket, Massachusetts, with stunning pink, sun rays
Beautiful homes built on the water overlooking the boats on the water below, in Nantucket, Massachusetts, with stunning pink, sun rays
December, the first month of the winter, in Nantucket, is also a frosty month, with average temperature varying between 30.9°F (-0.6°C) and 43.7°F (6.5°C).

Temperature

In Nantucket, Massachusetts, the average high-temperature in December marginally drops, from a cool 52°F (11.1°C) in November, to a chilly 43.7°F (6.5°C). In December, in Nantucket, the average low-temperature is 30.9°F (-0.6°C).

Rainfall

In December, the rain falls for 13 days. Throughout December, 3.8" (96.5mm) of precipitation is accumulated. Throughout the year, there are 120 rainfall days, and 44.4" (1128.3mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December.

Ocean temperature

In December, the average ocean temperature is 46°F (7.8°C). Swimming in 46°F (7.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

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

Sunshine

Months with the least sunshine in Nantucket are January, November and December, with an average of 5h of sunshine.

UV index

The month with the lowest UV index in Nantucket is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
In December, the average maximum UV index of 1 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Nantucket?

In Nantucket, in December, the average high-temperature is 43.7°F (6.5°C), and the average low-temperature is 30.9°F (-0.6°C).

How much does it rain in Nantucket in December?

In Nantucket, in December, during 13 rainfall days, 3.8" (96.5mm) of precipitation is typically accumulated.

How much does it snow in Nantucket in December?

During December, Nantucket regularly aggregates up to 5.8" (147.3mm) of snow.

What is the water temperature in December in Nantucket?

In Nantucket, the average seawater temperature in December is 46°F (7.8°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 Nantucket?

With an average of 9.3h of daylight, December has the shortest days of the year in Nantucket, Massachusetts.

What is the average length of the day in December in Nantucket?

In Nantucket, the average length of the day in December is 9.3h.

What is the month with the least sunshine in Nantucket?

January, November and December, with an average of 5h of sunshine, are months with the least sunshine in Nantucket.

How many hours of sunshine does Nantucket have in December?

The average sunshine in December is 5h.

What is the month with the lowest UV index in Nantucket?

December is the month with the lowest UV index in Nantucket, with an average maximum UV index of 1.

How high is the UV index in December in Nantucket?

The average daily maximum UV index in December in Nantucket, Massachusetts, is 1. A UV Index reading of 2, and below, represents a low health threat from unprotected exposure to the UV radiation.
Average temperature in December - Nantucket, MA
  • Average high temperature in December: 43.7°F

The warmest month (with the highest average high temperature) is July (75.1°F).
The month with the lowest average high temperature is January (38.1°F).

  • Average low temperature in December: 30.9°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (25.1°F).

Average rainfall in December - Nantucket, MA
  • Average rainfall in December: 3.8"

The wettest month (with the highest rainfall) is November (4.4").
The driest month (with the lowest rainfall) is February (2.7").

Average rainfall days in December - Nantucket, MA
  • Average rainfall days in December: 13 days

The month with the highest number of rainy days is December (13 days).
The month with the lowest number of rainy days is July (7 days).

Average snowfall in December - Nantucket, MA
  • Average snowfall in December: 5.8"

The month with the highest snowfall is February (8.5").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average sea temperature in December - Nantucket, MA
  • Average sea temperature in December: 46°F

The best month for swimming (with the highest average sea temperature) is August (67.6°F).
The coldest month (with the lowest average sea temperature) is February (37.9°F).

Average daylight in December / Average sunshine in December - Nantucket, MA
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 5h

The month with most sunshine is June (Average sunshine: 9h).
Months with least sunshine are January, November and December (Average sunshine: 5).

Average UV index in December - Nantucket, MA
  • Average UV index in December: 1

Months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 1).