December weather forecast
Marlborough, MA

Share

Weather in December

December, the first month of the winter in Marlborough, is still a cold month, with an average temperature fluctuating between 27°F (-2.8°C) and 38.3°F (3.5°C).

Temperature

In December, the average high-temperature decreases from a chilly 48.6°F (9.2°C) in November to a cold 38.3°F (3.5°C). During the month of December, the temperature falls to an average of 27°F (-2.8°C).

Humidity

The average relative humidity in December is 77%.

Rainfall

The wettest months are March, November and December, with an average 2.56" (65mm) of rainfall.

Snowfall

January through May, October through December are months with snowfall. In Marlborough, during December, snow falls for 5.5 days and regularly aggregates up to 4.65" (118mm) of snow. Throughout the year, there are 32.4 snowfall days, and 21.61" (549mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 6min of daylight.
On the first day of December, sunrise is at 6:56 am and sunset at 4:14 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:23 pm EST.

Sunshine

The average sunshine in December in Marlborough is 4.9h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 2 during December translates into the following recommendations:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. To guard against the harmful effects of the Sun, minimize exposure during midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.

Frequently asked questions

How cold does it get in December?

December temperatures vary between a high-temperature of 38.3°F (3.5°C) and a low-temperature of 27°F (-2.8°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in July is appraised at 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 77%.

What is the rainiest month?

The wettest months are March, November and December, with an average 2.56" (65mm) of rainfall.

How many days does it rain in December?

In Marlborough, in December, during 9.5 rainfall days, 2.56" (65mm) of precipitation is typically accumulated.

How much does it snow in December?

In December, it is snowing for 5.5 days. Throughout December, 4.65" (118mm) of snow is accumulated.

What is the month with the shortest days?

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

How many hours of daylight does Marlborough have in December?

In December, the average day length is 9h and 8min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 6:56 am and sunset at 4:14 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:23 pm EST.

How many hours of sunshine does Marlborough have in December?

In December, the average sunshine duration is 4.9h.

What are the months with the lowest UV index?

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability 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
Marlborough, MA

Average temperature in December - Marlborough, MA
  • Average high temperature in December: 38.3°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.5°F).

  • Average low temperature in December: 27°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

Average pressure in December
Marlborough, MA

Average pressure in December - Marlborough, MA
  • Average pressure in December: 30.04"Hg

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Marlborough, MA

Average wind speed in December - Marlborough, MA
  • Average wind speed in December: 8.1mph

The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in December
Marlborough, MA

Average humidity in December - Marlborough, MA
  • Average humidity in December: 77%

The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (71%).

Average rainfall in December
Marlborough, MA

Average rainfall in December - Marlborough, MA
  • Average rainfall in December: 2.56"

The wettest months (with the highest rainfall) are March, November and December (2.56").
The driest month (with the least rainfall) is September (1.34").

Average rainfall days in December
Marlborough, MA

Average rainfall days in December - Marlborough, MA
  • Average rainfall days in December: 9.5 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is January (6.8 days).

Average snowfall in December
Marlborough, MA

Average snowfall in December - Marlborough, MA
  • Average snowfall in December: 4.65"

The month with the highest snowfall is February (5.24").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Marlborough, MA

Average snowfall days in December - Marlborough, MA
  • Average snowfall days in December: 5.5 days

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

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

Average daylight in December / Average sunshine in December - Marlborough, MA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in December
Marlborough, MA

Average sunshine days in December - Marlborough, MA
  • Average sunshine days in December: 17.6 days

The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is April (13.4 days).

Average UV index in December
Marlborough, MA

Average UV index in December - Marlborough, 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).

Average cloud cover in December
Marlborough, MA

Average cloud cover in December - Marlborough, MA
  • Average cloud cover in December: 46

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).

Average visibility in December
Marlborough, MA

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

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

Marlborough, Massachusetts, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location