December weather forecast
Boylston, MA

Weather in December

December, the first month of the winter in Boylston, is still a cold month, with an average temperature ranging between min 26.6°F (-3°C) and max 37.4°F (3°C).

Temperature

In December, the average high-temperature decreases from a chilly 47.3°F (8.5°C) in November to a wintry 37.4°F (3°C). In December, the average low-temperature is 26.6°F (-3°C).

Humidity

The average relative humidity in December is 78%.

Rainfall

The month with the most rainfall in Boylston, Massachusetts, is December, when the rain falls for 10.7 days and typically aggregates up to 2.91" (74mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Boylston, during December, snow falls for 5.6 days and regularly aggregates up to 4.33" (110mm) of snow. Throughout the year, in Boylston, there are 36.5 snowfall days, and 23.82" (605mm) of snow is accumulated.

Daylight

With an average of 9h and 8min of daylight, December has the shortest days of the year in Boylston.
On the first day of the month, sunrise is at 6:56 am and sunset at 4:15 pm. On the last day of December, in Boylston, sunrise is at 7:15 am and sunset at 4:23 pm EST.

Sunshine

The average sunshine in December in Boylston, Massachusetts, is 4.8h.

UV index

The months with the lowest UV index in Boylston are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 2 in December transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in December in Boylston?

The average relative humidity in December in Boylston is 78%.

What is the rainiest month in Boylston?

December is the month with the most rainfall in Boylston. Rain falls for 10.7 days and accumulates 2.91" (74mm) of precipitation.

How much does it rain in Boylston in December?

In December, the rain falls for 10.7 days. Throughout December, 2.91" (74mm) of precipitation is accumulated.

How much does it snow in Boylston in December?

In Boylston, during December, snow falls for 5.6 days and regularly aggregates up to 4.33" (110mm) of snow.

What is the month with the shortest days in Boylston?

The month with the shortest days in Boylston, Massachusetts, is December, with an average of 9h and 8min of daylight.

How many hours of daylight does Boylston have in December?

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

When is the sunrise / sunset in December in Boylston?

On the first day of December in Boylston, sunrise is at 6:56 am and sunset at 4:15 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 Boylston have in December?

The average sunshine duration in December is 4.8h.

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

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

What is the UV index intensity in December in Boylston?

The average daily maximum UV index in December in Boylston, Massachusetts, is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.

Average temperature in December
Boylston, MA

Average temperature in December - Boylston, MA
  • Average high temperature in December: 37.4°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in December: 26.6°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in December
Boylston, MA

Average pressure in December - Boylston, 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).

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Average wind speed in December
Boylston, MA

Average wind speed in December - Boylston, MA
  • Average wind speed in December: 8.2mph

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).

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Average humidity in December
Boylston, MA

Average humidity in December - Boylston, MA
  • Average humidity in December: 78%

The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (71%).

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Average rainfall in December
Boylston, MA

Average rainfall in December - Boylston, MA
  • Average rainfall in December: 2.91"

The wettest month (with the highest rainfall) is December (2.91").
The driest month (with the least rainfall) is September (1.57").

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Average rainfall days in December
Boylston, MA

Average rainfall days in December - Boylston, MA
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (7.3 days).

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Average snowfall in December
Boylston, MA

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

The month with the highest snowfall is February (6.1").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Boylston, MA

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

The month with the highest number of snowfall days is February (9.4 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
Boylston, MA

Average daylight in December / Average sunshine in December - Boylston, MA
  • Average daylight in December: 9h and 8min

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

  • Average sunshine in December: 4.8h

The month with the most sunshine is August (Average sunshine: 10.2h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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Average sunshine days in December
Boylston, MA

Average sunshine days in December - Boylston, MA
  • Average sunshine days in December: 16.5 days

The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is July (12.8 days).

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Average UV index in December
Boylston, MA

Average UV index in December - Boylston, 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).

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Average cloud cover in December
Boylston, MA

Average cloud cover in December - Boylston, MA
  • Average cloud cover in December: 47

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

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Average visibility in December
Boylston, MA

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

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

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