December weather forecast
Wilmington, MA

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Weather in December

The first month of the winter, December, is also a wintry month in Wilmington, Massachusetts, with an average temperature varying between 38.8°F (3.8°C) and 28.9°F (-1.7°C).

Temperature

The transition into December indicates a reduction in the average high-temperature, down to a cold 38.8°F (3.8°C) from November's frosty 49.1°F (9.5°C). December witnesses an average low-temperature hovering around a freezing cold 28.9°F (-1.7°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

The month with the most rainfall is December, when the rain falls for 9.2 days and typically aggregates up to 2.87" (73mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Wilmington, during December, snow falls for 5.5 days and regularly aggregates up to 4.33" (110mm) of snow. In Wilmington, during the entire year, snow falls for 30.6 days and aggregates up to 18.86" (479mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 6:55 am and sunset at 4:12 pm. On the last day of December, sunrise is at 7:14 am and sunset at 4:21 pm EST.

Sunshine

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

UV index

The months with the lowest UV index in Wilmington are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: During December, 2 as the daily maximum UV index converts into the following advice:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.

Frequently asked questions

How cold is it in December?

During December, Wilmington experiences an average high-temperature of 38.8°F (3.8°C) and a low-temperature of 28.9°F (-1.7°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 84.2°F (29°C).

What is the average humidity in December?

In Wilmington, the average relative humidity in December is 76%.

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 9.2 days and accumulates 2.87" (73mm) of precipitation.

How much does it rain in December?

In Wilmington, in December, it is raining for 9.2 days, with typically 2.87" (73mm) of accumulated precipitation.

How many days does it snow in December?

In Wilmington, in December, snow falls for 5.5 days, with typically accumulated 4.33" (110mm) of snow.

What is the month with the shortest days?

With an average of 9h and 6min of daylight, December has the shortest days of the year.

How many hours of daylight does Wilmington have in December?

The average day length in December is 9h and 7min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 6:55 am and sunset at 4:12 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:21 pm EST.

How long on average sun shines in December?

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

When is 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 intensity in December?

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's 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
Wilmington, MA

Average temperature in December - Wilmington, MA
  • Average high temperature in December: 38.8°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.1°F).

  • Average low temperature in December: 28.9°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in December
Wilmington, MA

Average pressure in December - Wilmington, MA
  • Average pressure in December: 30.03"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).

Average wind speed in December
Wilmington, MA

Average wind speed in December - Wilmington, MA
  • Average wind speed in December: 8.9mph

The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

Average humidity in December
Wilmington, MA

Average humidity in December - Wilmington, MA
  • Average humidity in December: 76%

The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (69%).

Average rainfall in December
Wilmington, MA

Average rainfall in December - Wilmington, MA
  • Average rainfall in December: 2.87"

The wettest month (with the highest rainfall) is December (2.87").
The driest month (with the least rainfall) is September (1.22").

Average rainfall days in December
Wilmington, MA

Average rainfall days in December - Wilmington, MA
  • Average rainfall days in December: 9.2 days

The month with the highest number of rainy days is May (15.5 days).
The month with the least rainy days is January (7.4 days).

Average snowfall in December
Wilmington, MA

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

The month with the highest snowfall is February (4.96").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Wilmington, MA

Average snowfall days in December - Wilmington, MA
  • Average snowfall days in December: 5.5 days

The month with the highest number of snowfall days is January (7.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Wilmington, MA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 18min).
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 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

Average sunshine days in December
Wilmington, MA

Average sunshine days in December - Wilmington, MA
  • Average sunshine days in December: 17.2 days

The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is April (13.3 days).

Average UV index in December
Wilmington, MA

Average UV index in December - Wilmington, 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
Wilmington, MA

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

The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 32).

Average visibility in December
Wilmington, MA

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

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

Wilmington, Massachusetts, USA

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