December weather forecast
Hopkinton, MA

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Weather in December

December, the first month of the winter in Hopkinton, is still a cold month, with an average temperature varying between 39°F (3.9°C) and 28°F (-2.2°C).

Temperature

Hopkinton's December weather shows a moderate shift in high-temperatures, falling from November's chilly 49.1°F (9.5°C) to a wintry 39°F (3.9°C). The nights of December anticipate an average low-temperature of 28°F (-2.2°C).

Humidity

The average relative humidity in December is 77%.

Rainfall

In Hopkinton, Massachusetts, in December, during 10.1 rainfall days, 2.83" (72mm) of precipitation is typically accumulated. In Hopkinton, during the entire year, the rain falls for 157.5 days and collects up to 29.53" (750mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Hopkinton, during December, snow falls for 4.7 days and regularly aggregates up to 3.62" (92mm) of snow. In Hopkinton, during the entire year, snow falls for 28.8 days and aggregates up to 17.32" (440mm) of snow.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 6:55 am and sunset at 4:14 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:24 pm EST.

Sunshine

The average sunshine in December is 5h.

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 vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.

Frequently asked questions

How cold does it get in December?

In Hopkinton, in December, the average high-temperature is 39°F (3.9°C), and the average low-temperature is 28°F (-2.2°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December is 77%.

How many days does it rain in December?

In December, the rain falls for 10.1 days. Throughout December, 2.83" (72mm) of precipitation is accumulated.

How much does it snow in December?

In December, it is snowing for 4.7 days. Throughout December, 3.62" (92mm) of snow is accumulated.

What is the month with the shortest days?

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

What is the average length of the day in December?

In December, the average day length is 9h and 10min.

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 4:14 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:24 pm EST.

How many hours of sunshine does Hopkinton have in December?

The average sunshine duration in December is 5h.

What is the month with the lowest UV index?

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

What is the UV index reading in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Hopkinton, MA

Average temperature in December - Hopkinton, MA
  • Average high temperature in December: 39°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (33.1°F).

  • Average low temperature in December: 28°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 (21°F).

Average pressure in December
Hopkinton, MA

Average pressure in December - Hopkinton, 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 (29.93"Hg).

Average wind speed in December
Hopkinton, MA

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

The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

Average humidity in December
Hopkinton, MA

Average humidity in December - Hopkinton, MA
  • Average humidity in December: 77%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (70%).

Average rainfall in December
Hopkinton, MA

Average rainfall in December - Hopkinton, MA
  • Average rainfall in December: 2.83"

The wettest month (with the highest rainfall) is April (2.87").
The driest month (with the least rainfall) is September (1.54").

Average rainfall days in December
Hopkinton, MA

Average rainfall days in December - Hopkinton, MA
  • Average rainfall days in December: 10.1 days

The month with the highest number of rainy days is July (18.4 days).
The month with the least rainy days is January (7.5 days).

Average snowfall in December
Hopkinton, MA

Average snowfall in December - Hopkinton, MA
  • Average snowfall in December: 3.62"

The month with the highest snowfall is February (4.61").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Hopkinton, MA

Average snowfall days in December - Hopkinton, MA
  • Average snowfall days in December: 4.7 days

The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Hopkinton, 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: 5h and 0min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in December
Hopkinton, MA

Average sunshine days in December - Hopkinton, MA
  • Average sunshine days in December: 16 days

The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is June (11 days).

Average UV index in December
Hopkinton, MA

Average UV index in December - Hopkinton, 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
Hopkinton, MA

Average cloud cover in December - Hopkinton, 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 33).

Average visibility in December
Hopkinton, MA

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

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

Hopkinton, Massachusetts, USA

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