Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Harwich Port's transition into December involves a gentle shift in temperature, receding from a fresh 51.3°F (10.7°C) in November to a frosty 44.4°F (6.9°C). Harwich Port observes a consistent average low-temperature of 37.6°F (3.1°C) throughout December nights.Humidity
In December, the average relative humidity in Harwich Port is 75%.Rainfall
In Harwich Port, in December, it is raining for 11.2 days, with typically 2.05" (52mm) of accumulated precipitation. Throughout the year, there are 142.4 rainfall days, and 22.09" (561mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall in Harwich Port. In Harwich Port, in December, snow falls for 4.7 days, with typically accumulated 0.67" (17mm) of snow. Throughout the year, there are 20.8 snowfall days, and 4.37" (111mm) of snow is accumulated.Ocean temperature
In Harwich Port, the average seawater temperature in December is 46°F (7.8°C).Note: Beware when you're in 46°F (7.8°C) waters; 55.4°F (13°C) is chilling and anything below 50°F (10°C) could cause breathing hindrance and a sudden cold shock, given your physical condition.
Daylight
December has the shortest days of the year in Harwich Port, Massachusetts, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 6:48 am and sunset at 4:10 pm. On the last day of December, in Harwich Port, sunrise is at 7:07 am and sunset at 4:20 pm EST.
Sunshine
With an average of 4.3h of sunshine, December has the least sunshine of the year.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 minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A maximum high UV index of 2 in December translates into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Frequently asked questions
How cold is December in Harwich Port?
What is the average humidity in December in Harwich Port?
How much does it rain in Harwich Port in December?
How many days does it snow in December in Harwich Port?
What is the water temperature in December in Harwich Port?
What is the month with the shortest days in Harwich Port?
What is the average length of the day in December in Harwich Port?
When are sunrise and sunset in December in Harwich Port?
What is the month with the least sunshine in Harwich Port?
How long on average sun shines in December in Harwich Port?
What are the months with the lowest UV index in Harwich Port?
What is the UV index intensity in December in Harwich Port?
Average temperature in December
Harwich Port, 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
Harwich Port, 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
Harwich Port, 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
Harwich Port, 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
Harwich Port, 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
Harwich Port, 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
Harwich Port, 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
Harwich Port, 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 sea temperature in December
Harwich Port, MA
- Average sea temperature in December: 46.1°F
The best month for swimming (with the highest average sea temperature) is August (67.5°F).
The coldest month (with the lowest average sea temperature) is March (39°F).
Average daylight in December /
Average sunshine in December
Harwich Port, 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
Harwich Port, 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
Harwich Port, 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
Harwich Port, 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
Harwich Port, 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).
Harwich Port, Massachusetts, USA
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