December weather forecastSouth Wellfleet, MA
December
Weather in December
The first month of the winter, December, is also a frosty month in South Wellfleet, Massachusetts, with an average temperature fluctuating between 37.4°F (3°C) and 43.9°F (6.6°C).Temperature
Transitioning from November to December involves a subtle drop in average high-temperatures, descending from a cool 50.9°F (10.5°C) to a frosty 43.9°F (6.6°C). South Wellfleet's nighttime average temperature in December subtly descends to a cold 37.4°F (3°C) from the daily highs.Humidity
In South Wellfleet, the average relative humidity in December is 75%.Rainfall
In South Wellfleet, in December, it is raining for 11.7 days, with typically 1.57" (40mm) of accumulated precipitation. In South Wellfleet, 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 South Wellfleet, in December, snow falls for 4.7 days, with typically accumulated 0.51" (13mm) of snow. In South Wellfleet, during the entire year, snow falls for 22.1 days and aggregates up to 2.95" (75mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of December, sunrise is at 6:48 am and sunset at 4:09 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 4:18 pm EST.
Sunshine
December has the least sunshine of the year, 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 estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, the maximum UV index of 2 suggests this advice:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
South Wellfleet, 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
South Wellfleet, 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
South Wellfleet, 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
South Wellfleet, 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
South Wellfleet, 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
South Wellfleet, 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
South Wellfleet, 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
South Wellfleet, 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
South Wellfleet, MA
- Average daylight in December: 9h and 12min
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 12min
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
South Wellfleet, 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
South Wellfleet, 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
South Wellfleet, 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
South Wellfleet, 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).
