December weather forecast
Westfield, MA

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Weather in December

Wrapping up the year, December brings in the full swing of winter. Temperatures decrease even further, dropping to a low average of 25.5°F (-3.6°C), and the city experiences a high snowfall average of 4.33" (110mm), setting a wintry scene. Despite the freezing outdoor conditions, the city bustles with holiday activities and festive cheer. The crisp air combined with the cacophony of holiday music marks a perfect end to the year.

Temperature

A change in temperatures is noted as November gives way to December, with average highs reducing from a chilly 46.8°F (8.2°C) to a wintry 36.5°F (2.5°C). Throughout December, Westfield anticipates an average low-temperature of 25.5°F (-3.6°C).

Humidity

The average relative humidity in December is 80%.

Rainfall

The wettest months are October and December, with an average 3.27" (83mm) of rainfall.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 6.5 days. Throughout December, 4.33" (110mm) of snow is accumulated. In Westfield, Massachusetts, during the entire year, snow falls for 37.4 days and aggregates up to 21.77" (553mm) of snow.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year in Westfield.
On the first day of December, sunrise is at 7:00 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:29 pm EST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

The months with the lowest UV index in Westfield 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 low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 2 in December transforms into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
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Frequently asked questions

How cold is December in Westfield?

In Westfield, in December, the average high-temperature is 36.5°F (2.5°C), and the average low-temperature is 25.5°F (-3.6°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in July is evaluated at 87.8°F (31°C).

What is the average humidity in December in Westfield?

In December, the average relative humidity in Westfield, Massachusetts, is 80%.

What is the rainiest month in Westfield?

The months with the most rainfall in Westfield are October and December, with an average 3.27" (83mm) of precipitation.

How much does it rain in Westfield in December?

In December, in Westfield, Massachusetts, the rain falls for 11.5 days. Throughout December, 3.27" (83mm) of precipitation is accumulated.

How many days does it snow in December in Westfield?

In December, in Westfield, Massachusetts, it is snowing for 6.5 days. Throughout December, 4.33" (110mm) of snow is accumulated.

What is the month with the shortest days in Westfield?

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

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

The average day length in December is 9h and 10min.

When is the sunrise / sunset in December in Westfield?

In December, on the first day of the month, sunrise is at 7:00 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:29 pm EST.

How many hours of sunshine does Westfield have in December?

In Westfield, Massachusetts, the average sunshine duration in December is 4.8h.

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

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 Westfield?

In December, the average daily maximum UV index in Westfield, Massachusetts, is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability 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
Westfield, MA

Average temperature in December - Westfield, MA
  • Average high temperature in December: 36.5°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in December: 25.5°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (18°F).

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Average pressure in December
Westfield, MA

Average pressure in December - Westfield, MA
  • Average pressure in December: 30.05"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
Westfield, MA

Average wind speed in December - Westfield, MA
  • Average wind speed in December: 7.8mph

The windiest months (with the highest average wind speed) are January, February and March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in December
Westfield, MA

Average humidity in December - Westfield, MA
  • Average humidity in December: 80%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in December
Westfield, MA

Average rainfall in December - Westfield, MA
  • Average rainfall in December: 3.27"

The wettest months (with the highest rainfall) are October and December (3.27").
The driest month (with the least rainfall) is September (2.01").

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Average rainfall days in December
Westfield, MA

Average rainfall days in December - Westfield, MA
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is January (8.9 days).

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Average snowfall in December
Westfield, MA

Average snowfall in December - Westfield, MA
  • Average snowfall in December: 4.33"

The month with the highest snowfall is February (5.59").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Westfield, MA

Average snowfall days in December - Westfield, MA
  • Average snowfall days in December: 6.5 days

The month with the highest number of snowfall days is February (9.5 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
Westfield, MA

Average daylight in December / Average sunshine in December - Westfield, 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 12min).

  • Average sunshine in December: 4h and 5min

The months with the most sunshine are July and August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in December
Westfield, MA

Average sunshine days in December - Westfield, MA
  • Average sunshine days in December: 14.6 days

The month with the most sunshine days is January (16.2 days).
The month with the least sunshine days is June (10.3 days).

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Average UV index in December
Westfield, MA

Average UV index in December - Westfield, MA
  • Average UV index in December: 2

The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in December
Westfield, MA

Average cloud cover in December - Westfield, MA
  • Average cloud cover in December: 48

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

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Average visibility in December
Westfield, MA

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

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

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Westfield, Massachusetts, USA

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