December weather forecast
East Harwich, MA

Share

Weather in December

December, the first month of the winter in East Harwich, is still a chilly month, with temperature in the range of an average high of 44.4°F (6.9°C) and an average low of 37.6°F (3.1°C).

Temperature

December's onset introduces a mild reduction in the average high-temperature, from a fresh 51.3°F (10.7°C) in November to a frosty 44.4°F (6.9°C). A modest dip in temperatures to an average of 37.6°F (3.1°C) is observed throughout East Harwich's December nights.

Humidity

In East Harwich, the average relative humidity in December is 75%.

Rainfall

In East Harwich, during December, the rain falls for 11.2 days and regularly aggregates up to 2.05" (52mm) of precipitation. Throughout the year, there are 142.4 rainfall days, and 22.09" (561mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In East Harwich, in December, snow falls for 4.7 days, with typically accumulated 0.67" (17mm) of snow. In East Harwich, during the entire year, snow falls for 20.8 days and aggregates up to 4.37" (111mm) 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 6:48 am and sunset at 4:10 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 4:19 pm EST.

Sunshine

The month with the least sunshine is December, with an average of 4.3h of sunshine.

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 reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 2 in December translates into these instructions:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Updated: Aug 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

East Harwich in December has an average high-temperature of 44.4°F (6.9°C) and an average low-temperature of 37.6°F (3.1°C).

What is the average humidity in December?

In East Harwich, the average relative humidity in December is 75%.

How much does it rain in December?

In East Harwich, in December, it is raining for 11.2 days, with typically 2.05" (52mm) of accumulated precipitation.

How many days does it snow in December?

In East Harwich, in December, during 4.7 snowfall days, 0.67" (17mm) of snow is typically 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.

How many hours of daylight does East Harwich have in December?

The average day length in December is 9h and 13min.

When are sunrise and sunset in December in East Harwich?

On the first day of December, sunrise is at 6:48 am and sunset at 4:10 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 4:19 pm EST.

What is the month with the least sunshine?

With an average of 4.3h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December?

In December, the average sunshine duration is 4.3h.

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 East Harwich, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk 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
East Harwich, MA

Average temperature in December - East Harwich, MA
  • Average high temperature in December: 44.4°F

The warmest month (with the highest average high temperature) is August (71.6°F).
The months with the lowest average high temperature are January and February (39°F).

  • Average low temperature in December: 37.6°F

The month with the highest average low temperature is August (68.2°F).
The coldest month (with the lowest average low temperature) is January (31.6°F).

Average pressure in December
East Harwich, MA

Average pressure in December - East Harwich, 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
East Harwich, MA

Average wind speed in December - East Harwich, MA
  • Average wind speed in December: 17.5mph

The windiest month (with the highest average wind speed) is January (18mph).
The calmest month (with the lowest average wind speed) is August (11.4mph).

Average humidity in December
East Harwich, MA

Average humidity in December - East Harwich, MA
  • Average humidity in December: 75%

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

Average rainfall in December
East Harwich, MA

Average rainfall in December - East Harwich, MA
  • Average rainfall in December: 2.05"

The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is November (1.46").

Average rainfall days in December
East Harwich, MA

Average rainfall days in December - East Harwich, MA
  • Average rainfall days in December: 11.2 days

The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is February (8.3 days).

Average snowfall in December
East Harwich, MA

Average snowfall in December - East Harwich, MA
  • Average snowfall in December: 0.67"

The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
East Harwich, MA

Average snowfall days in December - East Harwich, MA
  • Average snowfall days in December: 4.7 days

The month with the highest number of snowfall days is January (6 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
East Harwich, MA

Average daylight in December / Average sunshine in December - East Harwich, 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 2min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).

Average sunshine days in December
East Harwich, MA

Average sunshine days in December - East Harwich, MA
  • Average sunshine days in December: 13.6 days

The month with the most sunshine days is August (17.6 days).
The month with the least sunshine days is January (13 days).

Average UV index in December
East Harwich, MA

Average UV index in December - East Harwich, 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
East Harwich, MA

Average cloud cover in December - East Harwich, MA
  • Average cloud cover in December: 54

The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in December
East Harwich, MA

Average visibility in December - East Harwich, 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).

East Harwich, Massachusetts, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location