December weather forecast
Sterling, MA

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Weather in December

The first month of the winter, December, is also a wintry month in Sterling, Massachusetts, with an average temperature fluctuating between 37.4°F (3°C) and 26.6°F (-3°C).

Temperature

The onset of December introduces a moderate change in Sterling's weather, with average high-temperatures falling from November's frosty 47.3°F (8.5°C) to an icy 37.4°F (3°C). The low-temperature averages to a freezing cold 26.6°F (-3°C) during the nights of December.

Humidity

In Sterling, the average relative humidity in December is 78%.

Rainfall

The month with the most rainfall 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 Sterling, during December, snow falls for 5.6 days and regularly aggregates up to 4.33" (110mm) of snow. Throughout the year, there are 36.5 snowfall days, and 23.82" (605mm) of snow is accumulated.

Daylight

With an average of 9h and 6min of daylight, December has the shortest days of the year in Sterling.
On the first day of the month, sunrise is at 6:57 am and sunset at 4:15 pm. On the last day of December, sunrise is at 7:16 am and sunset at 4:24 pm EST.

Sunshine

The average sunshine in December in Sterling is 4.8h.

UV index

The months with the lowest UV index in Sterling are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.
Note: In December, the UV index of 2 transforms into the following advice:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
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Frequently asked questions

How cold is it in Sterling in December?

The high-temperature during December is 37.4°F (3°C) and the low-temperature is 26.6°F (-3°C). In July, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is evaluated at 87.8°F (31°C).

What is the average humidity in December in Sterling?

In Sterling, the average relative humidity in December is 78%.

What is the rainiest month in Sterling?

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

How much does it rain in Sterling in December?

In Sterling, in December, it is raining for 10.7 days, with typically 2.91" (74mm) of accumulated precipitation.

How much does it snow in Sterling in December?

In Sterling, in December, during 5.6 snowfall days, 4.33" (110mm) of snow is typically accumulated.

What is the month with the shortest days in Sterling?

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

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

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

When is the sunrise / sunset in December in Sterling?

In December, on the first day of the month, sunrise is at 6:57 am and sunset at 4:15 pm. On the last day of the month, in Sterling, sunrise is at 7:16 am and sunset at 4:24 pm EST.

How long on average sun shines in December in Sterling?

The average sunshine duration in December in Sterling is 4.8h.

When is the lowest UV index in Sterling?

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

What is the UV index reading in December in Sterling?

In Sterling, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to 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
Sterling, MA

Average temperature in December - Sterling, 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
Sterling, MA

Average pressure in December - Sterling, 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
Sterling, MA

Average wind speed in December - Sterling, 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
Sterling, MA

Average humidity in December - Sterling, 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
Sterling, MA

Average rainfall in December - Sterling, 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
Sterling, MA

Average rainfall days in December - Sterling, 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
Sterling, MA

Average snowfall in December - Sterling, 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
Sterling, MA

Average snowfall days in December - Sterling, 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
Sterling, MA

Average daylight in December / Average sunshine in December - Sterling, 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 6min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is 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
Sterling, MA

Average sunshine days in December - Sterling, 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
Sterling, MA

Average UV index in December - Sterling, 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
Sterling, MA

Average cloud cover in December - Sterling, 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
Sterling, MA

Average visibility in December - Sterling, 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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Sterling, Massachusetts, USA

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