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

December weather forecast and climate
Gloucester, MA

December, the first month of the winter, in Gloucester, is still a cold month, with average temperature ranging between max 40.5°F (4.7°C) and min 32.5°F (0.3°C).

Temperature

In Gloucester, the average high-temperature in December slightly decreases, from a frosty 48.7°F (9.3°C) in November, to a cold 40.5°F (4.7°C). In December, in Gloucester, the average low-temperature is 32.5°F (0.3°C).

Humidity

In December, the average relative humidity is 75%.

Rainfall

The month with the most rainfall is December when the rain falls for 11.4 days and typically aggregates up to 3.23" (82mm) of precipitation.

Snowfall

Months with snowfall in Gloucester are January through April, November and December. In Gloucester, during December, snow falls for 4.9 days and regularly aggregates up to 2.01" (51mm) of snow. In Gloucester, Massachusetts, during the entire year, snow falls for 27.4 days, and aggregates up to 9.17" (233mm) of snow.

Ocean temperature

In Gloucester, in December, the average water temperature is 46°F (7.8°C).
Note: Swimming in 46°F (7.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

December has the shortest days of the year, with an average of 9.1h of daylight.

Sunshine

Months with the least sunshine in Gloucester are February and December, with an average of 4.8h of sunshine.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Gloucester. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 2 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 Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 Gloucester?

The average high-temperature, in December, is 40.5°F (4.7°C), while the average low-temperature is 32.5°F (0.3°C).

What is the average humidity in December in Gloucester?

The average relative humidity in December in Gloucester is 75%.

How many days does it rain in December in Gloucester?

In Gloucester, Massachusetts, during December, the rain falls for 11.4 days and regularly aggregates up to 3.23" (82mm) of precipitation.

What is the wettest month in Gloucester?

The month with the most rainfall in Gloucester is December when the rain falls for 11.4 days and typically aggregates up to 3.23" (82mm) of precipitation.

How much does it snow in Gloucester in December?

In Gloucester, Massachusetts, during December, snow falls for 4.9 days and regularly aggregates up to 2.01" (51mm) of snow.

How cold is the water in December in Gloucester?

In December, the average ocean temperature in Gloucester, Massachusetts, 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 Gloucester?

The month with the shortest days in Gloucester is December, with an average of 9.1h of daylight.

How many hours of daylight does Gloucester have in December?

In December, the average length of the day in Gloucester, Massachusetts, is 9.1h.

What is the month with the least sunshine in Gloucester?

February and December, with an average of 4.8h of sunshine, are months with the least sunshine.

How many hours of sunshine does Gloucester have in December?

In December, the average sunshine in Gloucester is 4.8h.

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

Months with the lowest UV index in Gloucester, Massachusetts, are January through March, November and December, with an average maximum UV index of 2.

What is the UV index reading in December in Gloucester?

In December, the average daily maximum UV index in Gloucester is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to the UV radiation.
Average temperature in December - Gloucester, MA
  • Average high temperature in December: 40.5°F

The warmest month (with the highest average high temperature) is August (73°F).
The month with the lowest average high temperature is January (34.9°F).

  • Average low temperature in December: 32.5°F

The month with the highest average low temperature is August (65.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

Average humidity in December - Gloucester, MA
  • Average humidity in December: 75%

The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is November (73%).

Average rainfall in December - Gloucester, MA
  • Average rainfall in December: 3.23"

The wettest month (with the highest rainfall) is December (3.23").
The driest month (with the least rainfall) is September (1.73").

Average rainfall days in December - Gloucester, MA
  • Average rainfall days in December: 11.4 days

The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (8.2 days).

Average snowfall in December - Gloucester, MA
  • Average snowfall in December: 2.01"

The month with the highest snowfall is February (2.6").
Months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December - Gloucester, MA
  • Average snowfall days in December: 4.9 days

The month with the highest number of snowfall days is January (7.8 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

Average sea temperature in December - Gloucester, MA
  • Average sea temperature in December: 45.9°F

The best month for swimming (with the highest average sea temperature) is August (66.4°F).
The coldest month (with the lowest average sea temperature) is March (38.8°F).

Average daylight in December / Average sunshine in December - Gloucester, MA
  • Average daylight in December: 9.1h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in December: 4.8h

The month with the most sunshine is August (Average sunshine: 10.8h).
Months with the least sunshine are February and December (Average sunshine: 4.8).

Average UV index in December - Gloucester, MA
  • Average UV index in December: 2

Months with the highest UV index are July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).