December weather forecast
Sterling, MA

Weather in December

December, the first month of the winter, in Sterling, is still a cold month, with average temperature varying between 26.6°F (-3°C) and 37.4°F (3°C).

Temperature

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

Humidity

In December, the average relative humidity is 78%.

Rainfall

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.

Snowfall

January through May, October through December are months with snowfall in Sterling. In Sterling, in December, snow falls for 5.6 days, with typically accumulated 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 9.1h of daylight, December has the shortest days of the year in Sterling.

Sunshine

In December, the average sunshine in Sterling is 4.8h.

UV index

Months with the lowest UV index 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 minimal health hazard from unsafe exposure to the UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 Sterling?

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

What is the wettest month in Sterling?

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

How much does it rain in Sterling in December?

In Sterling, in December, during 10.7 rainfall days, 2.91" (74mm) of precipitation is typically accumulated.

How much does it snow in Sterling in December?

In Sterling, Massachusetts, 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?

December has the shortest days of the year in Sterling, with an average of 9.1h of daylight.

How many hours of daylight does Sterling have in December?

In Sterling, the average length of the day in December is 9.1h.

How many hours of sunshine does Sterling have in December?

In December, the average sunshine in Sterling is 4.8h.

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

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 Sterling?

In December, the average daily maximum UV index in Sterling, Massachusetts, is 2. A UV Index of 2, and less, symbolizes a low health threat from the exposure to the Sun's UV rays.

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"

The month with the highest atmospheric pressure is November (30.07").
The month with the lowest atmospheric pressure is June (29.92").

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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").
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).
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: 9.1h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.1h).

  • 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
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

Months with the highest UV index are June, July and August (UV index 6).
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

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

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