December weather forecastSouth Chatham, MA
December
Weather in December
December, the first month of the winter in South Chatham, is also a frosty month, with an average temperature varying between 44.4°F (6.9°C) and 37.6°F (3.1°C).Temperature
The onset of December brings a small shift in high-temperatures, falling from a cool 51.3°F (10.7°C) in November to a chilly 44.4°F (6.9°C). South Chatham encounters an average temperature dip to a wintry 37.6°F (3.1°C) throughout December, subtly lower than its daytime maximum.Humidity
The average relative humidity in December is 75%.Rainfall
In South Chatham, 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 South Chatham, in December, during 4.7 snowfall days, 0.67" (17mm) of snow is typically accumulated. In South Chatham, Massachusetts, during the entire year, snow falls for 20.8 days and aggregates up to 4.37" (111mm) 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 4:10 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 4:19 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 reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: The UV index of 2 during December translates into the following guidance:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
South Chatham, 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
South Chatham, 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 Chatham, 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
South Chatham, 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
South Chatham, 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
South Chatham, 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
South Chatham, 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
South Chatham, 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
South Chatham, 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 18min
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
South Chatham, 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
South Chatham, 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 Chatham, 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
South Chatham, 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).
