December weather forecast
Truro, MA

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Weather in December

December, the first month of the winter in Truro, is also a frosty month, with an average temperature ranging between min 37.4°F (3°C) and max 43.9°F (6.6°C).

Temperature

December's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from November's fresh 50.9°F (10.5°C) to a frosty 43.9°F (6.6°C). During December, the nighttime temperatures align closely with the daytime averages, measuring a cold 37.4°F (3°C).

Humidity

The average relative humidity in December is 75%.

Rainfall

In December, the rain falls for 11.7 days. Throughout December, 1.57" (40mm) of precipitation is accumulated. In Truro, during the entire year, the rain falls for 136.1 days and collects up to 17.24" (438mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Truro, Massachusetts. In December, it is snowing for 4.7 days. Throughout December, 0.51" (13mm) of snow is accumulated. Throughout the year, there are 22.1 snowfall days, and 2.95" (75mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 12min of daylight.
On the first day of December, sunrise is at 6:49 am and sunset at 4:09 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 4:18 pm EST.

Sunshine

December has the least sunshine of the year in Truro, with an average of 4.2h of sunshine.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.
Note: A daily high UV index of 2 in December leads to these guidelines:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.

Frequently asked questions

Is December cold?

During December, Truro experiences an average high-temperature of 43.9°F (6.6°C) and a low-temperature of 37.4°F (3°C).

What is the average humidity in December?

In December, the average relative humidity is 75%.

How much does it rain in December?

In December, the rain falls for 11.7 days. Throughout December, 1.57" (40mm) of precipitation is accumulated.

How much does it snow in December?

In Truro, during December, snow falls for 4.7 days and regularly aggregates up to 0.51" (13mm) of snow.

What is the month with the shortest days?

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

How many hours of daylight does Truro have in December?

The average day length in December is 9h and 11min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 6:49 am and sunset at 4:09 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 4:18 pm EST.

What is the month with the least sunshine?

The month with the least sunshine is December, with an average of 4.2h of sunshine.

How many hours of sunshine does Truro have in December?

In Truro, the average sunshine duration in December is 4.2h.

What are the months 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?

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
Truro, MA

Average temperature in December - Truro, MA
  • Average high temperature in December: 43.9°F

The warmest month (with the highest average high temperature) is August (71.1°F).
The month with the lowest average high temperature is January (38.7°F).

  • Average low temperature in December: 37.4°F

The month with the highest average low temperature is August (67.6°F).
The coldest months (with the lowest average low temperature) are January and February (31.6°F).

Average pressure in December
Truro, MA

Average pressure in December - Truro, MA
  • Average pressure in December: 30.02"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Truro, MA

Average wind speed in December - Truro, MA
  • Average wind speed in December: 18mph

The windiest month (with the highest average wind speed) is January (18.5mph).
The calmest months (with the lowest average wind speed) are July and August (11.6mph).

Average humidity in December
Truro, MA

Average humidity in December - Truro, MA
  • Average humidity in December: 75%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is November (74%).

Average rainfall in December
Truro, MA

Average rainfall in December - Truro, MA
  • Average rainfall in December: 1.57"

The wettest month (with the highest rainfall) is October (2.17").
The driest months (with the least rainfall) are February and November (1.18").

Average rainfall days in December
Truro, MA

Average rainfall days in December - Truro, MA
  • Average rainfall days in December: 11.7 days

The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is February (7.3 days).

Average snowfall in December
Truro, MA

Average snowfall in December - Truro, MA
  • Average snowfall in December: 0.51"

The month with the highest snowfall is February (0.94").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Truro, MA

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

The month with the highest number of snowfall days is January (6.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Truro, 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: 4h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).

Average sunshine days in December
Truro, MA

Average sunshine days in December - Truro, MA
  • Average sunshine days in December: 13.1 days

The month with the most sunshine days is August (18.2 days).
The month with the least sunshine days is December (13.1 days).

Average UV index in December
Truro, MA

Average UV index in December - Truro, MA
  • Average UV index in December: 2

The months with the highest UV index are 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
Truro, MA

Average cloud cover in December - Truro, MA
  • Average cloud cover in December: 55

The month with the most cloud cover is December (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 28).

Average visibility in December
Truro, MA

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

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

Truro, Massachusetts, USA

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