December weather forecast
East Boston, MA

Weather in December

The first month of the winter, December, is also a wintry month in East Boston, Massachusetts, with temperature in the range of an average high of 39.9°F (4.4°C) and an average low of 29.7°F (-1.3°C).

Temperature

In East Boston, the average high-temperature in December drops from a frosty 49.5°F (9.7°C) in November to a wintry 39.9°F (4.4°C). In East Boston, in December, the average low-temperature is 29.7°F (-1.3°C).

Humidity

The average relative humidity in December in East Boston is 76%.

Rainfall

The months with the most rainfall in East Boston are March, April and December, with an average 2.91" (74mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In East Boston, Massachusetts, during December, snow falls for 5.2 days and regularly aggregates up to 2.83" (72mm) of snow. In East Boston, during the entire year, snow falls for 29.8 days and aggregates up to 15.75" (400mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 8min of daylight.
On the first day of December in East Boston, sunrise is at 6:53 am and sunset at 4:12 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 4:21 pm EST.

Sunshine

In December, the average sunshine in East Boston is 4.7h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in East Boston. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. 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 temperature in December in East Boston?

The average high-temperature, in December, in East Boston, is 39.9°F (4.4°C), while the average low-temperature is 29.7°F (-1.3°C). in July, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines air temperature and relative humidity, is computed to be 86°F (30°C).

What is the average humidity in December in East Boston?

The average relative humidity in December in East Boston is 76%.

What is the rainiest month in East Boston?

The months with the most rainfall in East Boston, Massachusetts, are March, April and December, with an average 2.91" (74mm) of precipitation.

How much does it rain in East Boston in December?

In East Boston, Massachusetts, in December, it is raining for 10.1 days, with typically 2.91" (74mm) of accumulated precipitation.

How many days does it snow in December in East Boston?

In December, it is snowing for 5.2 days. Throughout December, 2.83" (72mm) of snow is accumulated.

What is the month with the shortest days in East Boston?

With an average of 9h and 8min of daylight, December has the shortest days of the year.

How many hours of daylight does East Boston have in December?

In East Boston, Massachusetts, the average day length in December is 9h and 8min.

When are sunrise and sunset in December in East Boston?

On the first day of December in East Boston, Massachusetts, sunrise is at 6:53 am and sunset at 4:12 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 4:21 pm EST.

How many hours of sunshine does East Boston have in December?

In East Boston, the average sunshine duration in December is 4.7h.

What are the months with the lowest UV index in East Boston?

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

What is the UV index intensity in December in East Boston?

The average daily maximum UV index in December in East Boston, Massachusetts, is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.
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
East Boston, MA

Average temperature in December - East Boston, MA
  • Average high temperature in December: 39.9°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (34.2°F).

  • Average low temperature in December: 29.7°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

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Average pressure in December
East Boston, MA

Average pressure in December - East Boston, MA
  • Average pressure in December: 30.03"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
East Boston, MA

Average wind speed in December - East Boston, MA
  • Average wind speed in December: 9.4mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average humidity in December
East Boston, MA

Average humidity in December - East Boston, 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 (69%).

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Average rainfall in December
East Boston, MA

Average rainfall in December - East Boston, MA
  • Average rainfall in December: 2.91"

The wettest months (with the highest rainfall) are March, April and December (2.91").
The driest month (with the least rainfall) is September (1.26").

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Average rainfall days in December
East Boston, MA

Average rainfall days in December - East Boston, MA
  • Average rainfall days in December: 10.1 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (7.9 days).

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Average snowfall in December
East Boston, MA

Average snowfall in December - East Boston, MA
  • Average snowfall in December: 2.83"

The month with the highest snowfall is February (4.72").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
East Boston, MA

Average snowfall days in December - East Boston, MA
  • Average snowfall days in December: 5.2 days

The months with the highest number of snowfall days are January and February (7.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
East Boston, MA

Average daylight in December / Average sunshine in December - East Boston, MA
  • Average daylight in December: 9h and 8min

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

  • Average sunshine in December: 4h and 42min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in December
East Boston, MA

Average sunshine days in December - East Boston, MA
  • Average sunshine days in December: 16.5 days

The month with the most sunshine days is September (17.7 days).
The month with the least sunshine days is April (13 days).

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Average UV index in December
East Boston, MA

Average UV index in December - East Boston, MA
  • 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
East Boston, MA

Average cloud cover in December - East Boston, MA
  • Average cloud cover in December: 48

The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in December
East Boston, MA

Average visibility in December - East Boston, MA
  • 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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