December weather forecast
Boston, NY

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Weather in December

December, the first month of the winter in Boston, is also an icy month, with an average temperature fluctuating between 34.3°F (1.3°C) and 25.7°F (-3.5°C).

Temperature

The arrival of December corresponds with a shift in temperature, down from a chilly 43.9°F (6.6°C) in November to a wintry 34.3°F (1.3°C). Nighttime temperatures hover around an average low of 25.7°F (-3.5°C) in December, a slight descent from daytime highs.

Humidity

In Boston, New York, the average relative humidity in December is 87%.

Rainfall

In Boston, during December, the rain falls for 8.9 days and regularly aggregates up to 1.46" (37mm) of precipitation. Throughout the year, in Boston, there are 151.9 rainfall days, and 19.21" (488mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Boston, New York, are January through May, October through December. In Boston, during December, snow falls for 14.4 days and regularly aggregates up to 3.7" (94mm) of snow. Throughout the year, in Boston, there are 71.6 snowfall days, and 19.21" (488mm) of snow is accumulated.

Daylight

With an average of 9h and 6min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:25 am and sunset at 4:42 pm. On the last day of December, in Boston, sunrise is at 7:44 am and sunset at 4:51 pm EST.

Sunshine

In Boston, New York, the average sunshine in December is 2.6h.

UV index

January, February and December, with an average maximum UV index of 1, are months with the lowest UV index in Boston, New York. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index, 1 in December, converts into the following recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
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Frequently asked questions

How cold is December in Boston?

The high-temperature, in December, in Boston, records 34.3°F (1.3°C), while the low-temperature is 25.7°F (-3.5°C).

What is the average humidity in December in Boston?

The average relative humidity in December in Boston, New York, is 87%.

How much does it rain in Boston in December?

In Boston, New York, in December, it is raining for 8.9 days, with typically 1.46" (37mm) of accumulated precipitation.

How many days does it snow in December in Boston?

In December, it is snowing for 14.4 days. Throughout December, 3.7" (94mm) of snow is accumulated.

What is the month with the shortest days in Boston?

With an average of 9h and 6min of daylight, December has the shortest days of the year in Boston, New York.

How many hours of daylight does Boston have in December?

The average day length in December in Boston is 9h and 7min.

What time are sunrise and sunset in December in Boston?

On the first day of December in Boston, sunrise is at 7:25 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 4:51 pm EST.

How many hours of sunshine does Boston have in December?

The average sunshine duration in December in Boston, New York, is 2.6h.

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

The months with the lowest UV index in Boston are January, February and December, with an average maximum UV index of 1.

What is the UV index reading in December in Boston?

In Boston, the average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a low health risk 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
Boston, NY

Average temperature in December - Boston, NY
  • Average high temperature in December: 34.3°F

The warmest month (with the highest average high temperature) is July (77.2°F).
The month with the lowest average high temperature is January (27.9°F).

  • Average low temperature in December: 25.7°F

The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

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Average pressure in December
Boston, NY

Average pressure in December - Boston, NY
  • Average pressure in December: 30.07"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
Boston, NY

Average wind speed in December - Boston, NY
  • Average wind speed in December: 10.2mph

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

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Average humidity in December
Boston, NY

Average humidity in December - Boston, NY
  • Average humidity in December: 87%

The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is May (79%).

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Average rainfall in December
Boston, NY

Average rainfall in December - Boston, NY
  • Average rainfall in December: 1.46"

The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is September (1.22").

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Average rainfall days in December
Boston, NY

Average rainfall days in December - Boston, NY
  • Average rainfall days in December: 8.9 days

The month with the highest number of rainy days is October (17.2 days).
The month with the least rainy days is February (5.8 days).

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Average snowfall in December
Boston, NY

Average snowfall in December - Boston, NY
  • Average snowfall in December: 3.7"

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

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Average snowfall days in December
Boston, NY

Average snowfall days in December - Boston, NY
  • Average snowfall days in December: 14.4 days

The month with the highest number of snowfall days is January (16.7 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
Boston, NY

Average daylight in December / Average sunshine in December - Boston, NY
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 2h and 4min

The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).

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Average sunshine days in December
Boston, NY

Average sunshine days in December - Boston, NY
  • Average sunshine days in December: 10.1 days

The month with the most sunshine days is September (14 days).
The month with the least sunshine days is January (8.6 days).

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Average UV index in December
Boston, NY

Average UV index in December - Boston, NY
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).

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Average cloud cover in December
Boston, NY

Average cloud cover in December - Boston, NY
  • Average cloud cover in December: 74

The month with the most cloud cover is January (Cloud cover 78).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in December
Boston, NY

Average visibility in December - Boston, NY
  • Average visibility in December: 5mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).

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Boston, New York, USA

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