December weather forecast
Billerica, MA

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Weather in December

December, the first month of the winter in Billerica, is also an icy month, with an average temperature varying between 37.9°F (3.3°C) and 27.3°F (-2.6°C).

Temperature

Onset of December witnesses a reduction in the average high-temperature, falling from a chilly 48.2°F (9°C) in November to a wintry 37.9°F (3.3°C). Billerica experiences an average low-temperature of 27.3°F (-2.6°C) in month of December.

Humidity

The average relative humidity in December is 77%.

Rainfall

December is the month with the most rainfall. Rain falls for 10.9 days and accumulates 2.87" (73mm) of precipitation.

Snowfall

Months with snowfall in Billerica are January through May, October through December. In Billerica, in December, snow falls for 5.6 days, with typically accumulated 4.41" (112mm) of snow. Throughout the year, there are 32.6 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 6:55 am and sunset at 4:12 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:21 pm EST.

Sunshine

The average sunshine in December is 4.9h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 2 in December transforms into the following instructions:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Updated: Jun 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature during December is 37.9°F (3.3°C) and the low-temperature is 27.3°F (-2.6°C). In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines relative humidity and air temperature, is computed to be 84.2°F (29°C).

What is the average humidity in December?

The average relative humidity in December is 77%.

What is the wettest month?

The month with the most rainfall is December, when the rain falls for 10.9 days and typically aggregates up to 2.87" (73mm) of precipitation.

How many days does it rain in December?

In December, the rain falls for 10.9 days. Throughout December, 2.87" (73mm) of precipitation is accumulated.

How much does it snow in December?

In Billerica, during December, snow falls for 5.6 days and regularly aggregates up to 4.41" (112mm) of snow.

What is the month with the shortest days?

The month with the shortest days in Billerica, Massachusetts, is December, with an average of 9h and 6min of daylight.

How many hours of daylight does Billerica have in December?

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

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 6:55 am and sunset at 4:12 pm. On the last day of the month, in Billerica, sunrise is at 7:14 am and sunset at 4:21 pm EST.

How many hours of sunshine does Billerica have in December?

In Billerica, the average sunshine duration in December is 4.9h.

When is the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from exposure to the Sun's 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
Billerica, MA

Average temperature in December - Billerica, MA
  • Average high temperature in December: 37.9°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 (32.5°F).

  • Average low temperature in December: 27.3°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).

Average pressure in December
Billerica, MA

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

Average wind speed in December - Billerica, MA
  • Average wind speed in December: 8.3mph

The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

Average humidity in December
Billerica, MA

Average humidity in December - Billerica, 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 (70%).

Average rainfall in December
Billerica, MA

Average rainfall in December - Billerica, MA
  • Average rainfall in December: 2.87"

The wettest month (with the highest rainfall) is December (2.87").
The driest month (with the least rainfall) is September (1.46").

Average rainfall days in December
Billerica, MA

Average rainfall days in December - Billerica, MA
  • Average rainfall days in December: 10.9 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (6.9 days).

Average snowfall in December
Billerica, MA

Average snowfall in December - Billerica, MA
  • Average snowfall in December: 4.41"

The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Billerica, MA

Average snowfall days in December - Billerica, MA
  • Average snowfall days in December: 5.6 days

The month with the highest number of snowfall days is February (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Billerica, MA
  • 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: 4h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in December
Billerica, MA

Average sunshine days in December - Billerica, MA
  • Average sunshine days in December: 16.6 days

The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is May (13.6 days).

Average UV index in December
Billerica, MA

Average UV index in December - Billerica, 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
Billerica, MA

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

The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).

Average visibility in December
Billerica, MA

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

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

Billerica, Massachusetts, USA

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