December weather forecast and climate
Swampscott, MA

Weather in December

The first month of the winter, December, is still a cold month in Swampscott, Massachusetts, with average temperature varying between 39.9°F (4.4°C) and 30.2°F (-1°C).

Temperature

In December, the average high-temperature decreases, from a frosty 49.5°F (9.7°C) in November, to a cold 39.9°F (4.4°C). In December, the average low-temperature is 30.2°F (-1°C).

Humidity

In December, the average relative humidity in Swampscott is 76%.

Rainfall

The month with the most rainfall is December when the rain falls for 10.3 days and typically aggregates up to 2.99" (76mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall in Swampscott. In Swampscott, during December, snow falls for 5.3 days and regularly aggregates up to 3.43" (87mm) of snow. In Swampscott, during the entire year, snow falls for 29.9 days, and aggregates up to 15.59" (396mm) of snow.

Ocean temperature

In December, the average ocean temperature in Swampscott is 46.2°F (7.9°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

With an average of 9.1h of daylight, December has the shortest days of the year in Swampscott.

Sunshine

Months with the least sunshine are February and December, with an average of 4.6h of sunshine.

UV index

Months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 2 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 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in December in Swampscott?

In December, the average relative humidity is 76%.

What is the wettest month in Swampscott?

The month with the most rainfall in Swampscott, Massachusetts, is December when the rain falls for 10.3 days and typically aggregates up to 2.99" (76mm) of precipitation.

How many days does it rain in December in Swampscott?

In Swampscott, Massachusetts, in December, it is raining for 10.3 days, with typically 2.99" (76mm) of accumulated precipitation.

How many days does it snow in December in Swampscott?

In December, in Swampscott, it is snowing for 5.3 days. Throughout December, 3.43" (87mm) of snow is accumulated.

What is the water temperature in December in Swampscott?

In Swampscott, Massachusetts, in December, the average water temperature is 46.2°F (7.9°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 Swampscott?

With an average of 9.1h of daylight, December has the shortest days of the year in Swampscott, Massachusetts.

How many hours of daylight does Swampscott have in December?

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

What is the month with the least sunshine in Swampscott?

Months with the least sunshine are February and December, with an average of 4.6h of sunshine.

How long on average sun shines in December in Swampscott?

In December, the average sunshine is 4.6h.

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

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

How high is the UV index in December in Swampscott?

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

Average temperature in December
Swampscott, MA

Average temperature in December - Swampscott, MA
  • Average high temperature in December: 39.9°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 (34.2°F).

  • Average low temperature in December: 30.2°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).

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Average pressure in December
Swampscott, MA

Average pressure in December - Swampscott, MA
  • Average pressure in December: 30.03"

The month with the highest atmospheric pressure is November (30.06").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in December
Swampscott, MA

Average wind speed in December - Swampscott, MA
  • Average wind speed in December: 10.3mph

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

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Average humidity in December
Swampscott, MA

Average humidity in December - Swampscott, MA
  • Average humidity in December: 76%

The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is April (70%).

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Average rainfall in December
Swampscott, MA

Average rainfall in December - Swampscott, MA
  • Average rainfall in December: 2.99"

The wettest month (with the highest rainfall) is December (2.99").
The driest month (with the least rainfall) is September (1.42").

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Average rainfall days in December
Swampscott, MA

Average rainfall days in December - Swampscott, MA
  • Average rainfall days in December: 10.3 days

The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (7.1 days).

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Average snowfall in December
Swampscott, MA

Average snowfall in December - Swampscott, MA
  • Average snowfall in December: 3.43"

The month with the highest snowfall is February (4.61").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Swampscott, MA

Average snowfall days in December - Swampscott, MA
  • Average snowfall days in December: 5.3 days

Months with the highest number of snowfall days are January and February (7.7 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in December
Swampscott, MA

Average sea temperature in December - Swampscott, MA
  • Average sea temperature in December: 46.3°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 March (38.8°F).

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Average daylight in December /
Average sunshine in December
Swampscott, MA

Average daylight in December / Average sunshine in December - Swampscott, 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: 4.6h

The month with the most sunshine is August (Average sunshine: 10.4h).
Months with the least sunshine are February and December (Average sunshine: 4.6).

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Average sunshine days in December
Swampscott, MA

Average sunshine days in December - Swampscott, MA
  • Average sunshine days in December: 16.1 days

The month with the most sunshine days is January (17.8 days).
The month with the least sunshine days is April (13.2 days).

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Average UV index in December
Swampscott, MA

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

Months with the highest UV index are June, July and August (UV index 6).
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
Swampscott, MA

Average cloud cover in December - Swampscott, MA
  • Average cloud cover in December: 49

The month with the most cloud cover is March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in December
Swampscott, MA

Average visibility in December - Swampscott, MA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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