December weather forecast
Marlborough, CT

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Weather in December

The first month of the winter, December, is also a wintry month in Marlborough, Connecticut, with an average temperature fluctuating between 40.3°F (4.6°C) and 29.7°F (-1.3°C).

Temperature

The arrival of December corresponds with a reduction in the average high-temperature, down from November's chilly 49.6°F (9.8°C) to a cold 40.3°F (4.6°C). Throughout December, Marlborough encounters an average temperature drop to a subzero cold 29.7°F (-1.3°C).

Humidity

The average relative humidity in December in Marlborough is 76%.

Rainfall

The month with the most rainfall in Marlborough, Connecticut, is December, when the rain falls for 6.8 days and typically aggregates up to 1.02" (26mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall in Marlborough. In December, it is snowing for 4.1 days. Throughout December, 0.75" (19mm) of snow is accumulated. Throughout the year, there are 22.3 snowfall days, and 3.82" (97mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 12min of daylight.
On the first day of the month, sunrise is at 6:57 am and sunset at 4:20 pm. On the last day of December, in Marlborough, sunrise is at 7:16 am and sunset at 4:29 pm EST.

Sunshine

The months with the least sunshine in Marlborough are February and December, with an average of 4.6h of sunshine.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index, 1 in December, converts into the following recommendations:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
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Frequently asked questions

How cold is it in Marlborough in December?

In Marlborough, 40.3°F (4.6°C) is the average high-temperature and 29.7°F (-1.3°C) is the average low-temperature during December. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in July is appraised at 87.8°F (31°C).

What is the average humidity in December in Marlborough?

In December, the average relative humidity is 76%.

What is the wettest month in Marlborough?

December is the month with the most rainfall in Marlborough, Connecticut. Rain falls for 6.8 days and accumulates 1.02" (26mm) of precipitation.

How many days does it rain in December in Marlborough?

In December, in Marlborough, the rain falls for 6.8 days. Throughout December, 1.02" (26mm) of precipitation is accumulated.

How many days does it snow in December in Marlborough?

In Marlborough, Connecticut, in December, during 4.1 snowfall days, 0.75" (19mm) of snow is typically accumulated.

What is the month with the shortest days in Marlborough?

December has the shortest days of the year in Marlborough, Connecticut, with an average of 9h and 12min of daylight.

What is the average length of the day in December in Marlborough?

In Marlborough, the average day length in December is 9h and 13min.

What time are sunrise and sunset in December in Marlborough?

On the first day of December in Marlborough, Connecticut, sunrise is at 6:57 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:29 pm EST.

What is the month with the least sunshine in Marlborough?

February and December, with an average of 4.6h of sunshine, are months with the least sunshine in Marlborough.

How long on average sun shines in December in Marlborough?

The average sunshine duration in December in Marlborough, Connecticut, is 4.6h.

When is the lowest UV index in Marlborough?

With an average maximum UV index of 1, December is the month with the lowest UV index in Marlborough, Connecticut.

What is the UV index reading in December in Marlborough?

The average daily maximum UV index in December in Marlborough is 1. A UV Index reading 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, CT

Average temperature in December - Marlborough, CT
  • Average high temperature in December: 40.3°F

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in December: 29.7°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).

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Average pressure in December
Marlborough, CT

Average pressure in December - Marlborough, CT
  • Average pressure in December: 30.05"Hg

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
Marlborough, CT

Average wind speed in December - Marlborough, CT
  • Average wind speed in December: 8.3mph

The windiest months (with the highest average wind speed) are January and March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in December
Marlborough, CT

Average humidity in December - Marlborough, CT
  • Average humidity in December: 76%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (71%).

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Average rainfall in December
Marlborough, CT

Average rainfall in December - Marlborough, CT
  • Average rainfall in December: 1.02"

The wettest month (with the highest rainfall) is December (1.02").
The driest month (with the least rainfall) is September (0.35").

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Average rainfall days in December
Marlborough, CT

Average rainfall days in December - Marlborough, CT
  • Average rainfall days in December: 6.8 days

The month with the highest number of rainy days is July (11.8 days).
The month with the least rainy days is January (5.1 days).

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Average snowfall in December
Marlborough, CT

Average snowfall in December - Marlborough, CT
  • Average snowfall in December: 0.75"

The month with the highest snowfall is March (1.26").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in December
Marlborough, CT

Average snowfall days in December - Marlborough, CT
  • Average snowfall days in December: 4.1 days

The month with the highest number of snowfall days is February (6.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

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

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

  • Average sunshine in December: 4h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The months with the least sunshine are February and December (Average sunshine: 4h and 36min).

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Average sunshine days in December
Marlborough, CT

Average sunshine days in December - Marlborough, CT
  • Average sunshine days in December: 20.2 days

The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is July (17.1 days).

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Average UV index in December
Marlborough, CT

Average UV index in December - Marlborough, CT
  • Average UV index in December: 1

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in December
Marlborough, CT

Average cloud cover in December - Marlborough, CT
  • Average cloud cover in December: 49

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

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Average visibility in December
Marlborough, CT

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

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

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Marlborough, Connecticut, USA

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