December weather forecast
Westford, VT

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Weather in December

December, the first month of the winter in Westford, is also a subzero cold month, with an average temperature varying between 30°F (-1.1°C) and 20.5°F (-6.4°C).

Temperature

Onset of December witnesses a reduction in the average high-temperature, falling from a wintry 41.5°F (5.3°C) in November to a subzero cold 30°F (-1.1°C). December in Westford is noted for a mean low-temperature of 20.5°F (-6.4°C).

Humidity

In December, the average relative humidity is 84%.

Rainfall

In December, in Westford, the rain falls for 12 days. Throughout December, 2.17" (55mm) of precipitation is accumulated. Throughout the year, there are 172.5 rainfall days, and 28.07" (713mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Westford, during December, snow falls for 18.2 days and regularly aggregates up to 7.2" (183mm) of snow. Throughout the year, there are 92.6 snowfall days, and 43.98" (1117mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Westford, with an average of 8h and 54min of daylight.
On the first day of the month, sunrise is at 7:09 am and sunset at 4:13 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:21 pm EST.

Sunshine

In December, the average sunshine in Westford is 3.5h.

UV index

The months with the lowest UV index in Westford are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 1 in December transforms into the following instructions:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. To avoid the Sun's strongest rays, limit exposure around the mid-day period. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December in Westford?

During December, Westford experiences an average high-temperature of 30°F (-1.1°C) and a low-temperature of 20.5°F (-6.4°C).

What is the average humidity in December in Westford?

In December, the average relative humidity in Westford is 84%.

How much does it rain in Westford in December?

In Westford, Vermont, in December, during 12 rainfall days, 2.17" (55mm) of precipitation is typically accumulated.

How much does it snow in Westford in December?

In December, in Westford, it is snowing for 18.2 days. Throughout December, 7.2" (183mm) of snow is accumulated.

What is the month with the shortest days in Westford?

With an average of 8h and 54min of daylight, December has the shortest days of the year.

How many hours of daylight does Westford have in December?

The average day length in December in Westford is 8h and 53min.

When is the sunrise / sunset in December in Westford?

On the first day of December in Westford, Vermont, sunrise is at 7:09 am and sunset at 4:13 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:21 pm EST.

How many hours of sunshine does Westford have in December?

In December, the average sunshine duration is 3.5h.

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

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

What is the UV index reading in December in Westford?

The average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a low health threat from 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
Westford, VT

Average temperature in December - Westford, VT
  • Average high temperature in December: 30°F

The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (24.3°F).

  • Average low temperature in December: 20.5°F

The month with the highest average low temperature is July (58.1°F).
The coldest month (with the lowest average low temperature) is January (12°F).

Average pressure in December
Westford, VT

Average pressure in December - Westford, VT
  • 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 (29.91"Hg).

Average wind speed in December
Westford, VT

Average wind speed in December - Westford, VT
  • Average wind speed in December: 7mph

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

Average humidity in December
Westford, VT

Average humidity in December - Westford, VT
  • Average humidity in December: 84%

The months with the highest relative humidity are January and February (87%).
The months with the lowest relative humidity are April and May (76%).

Average rainfall in December
Westford, VT

Average rainfall in December - Westford, VT
  • Average rainfall in December: 2.17"

The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is February (1.73").

Average rainfall days in December
Westford, VT

Average rainfall days in December - Westford, VT
  • Average rainfall days in December: 12 days

The month with the highest number of rainy days is June (18.6 days).
The month with the least rainy days is January (9 days).

Average snowfall in December
Westford, VT

Average snowfall in December - Westford, VT
  • Average snowfall in December: 7.2"

The month with the highest snowfall is February (9.65").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Westford, VT

Average snowfall days in December - Westford, VT
  • Average snowfall days in December: 18.2 days

The month with the highest number of snowfall days is January (20.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Westford, VT

Average daylight in December / Average sunshine in December - Westford, VT
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in December: 3h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 3h and 6min).

Average sunshine days in December
Westford, VT

Average sunshine days in December - Westford, VT
  • Average sunshine days in December: 6.8 days

The month with the most sunshine days is September (15.2 days).
The month with the least sunshine days is February (6 days).

Average UV index in December
Westford, VT

Average UV index in December - Westford, VT
  • Average UV index in December: 1

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

Average cloud cover in December
Westford, VT

Average cloud cover in December - Westford, VT
  • Average cloud cover in December: 66

The month with the most cloud cover is February (Cloud cover 70).
The months with the least cloud cover are July and August (Cloud cover 33).

Average visibility in December
Westford, VT

Average visibility in December - Westford, VT
  • Average visibility in December: 5mi

The months with the highest visibility are May, July and August (6mi).
The months with the lowest visibility are January, February and March (4mi).

Westford, Vermont, USA

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