December weather forecastActon, MA
December
Weather in December
December, the first month of the winter in Acton, is also an icy month, with an average temperature varying between 38.3°F (3.5°C) and 27.3°F (-2.6°C).Temperature
December implies a gentle temperature shift, with average high-temperatures reducing from November's chilly 48.6°F (9.2°C) to a cold 38.3°F (3.5°C). Acton, during the nights of December, experiences an average temperature drop to a freezing cold 27.3°F (-2.6°C).Humidity
In Acton, the average relative humidity in December is 77%.Rainfall
In Acton, in December, during 7.5 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. In Acton, Massachusetts, during the entire year, the rain falls for 116.3 days and collects up to 15.87" (403mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In December, it is snowing for 4.2 days. Throughout December, 2.32" (59mm) of snow is accumulated. In Acton, during the entire year, snow falls for 25.5 days and aggregates up to 11.42" (290mm) of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year in Acton, Massachusetts.On the first day of the month, sunrise is at 6:56 am and sunset at 4:13 pm. On the last day of December, sunrise is at 7:15 am and sunset at 4:22 pm EST.
Sunshine
In December, the average sunshine is 4.8h.UV index
The months with the lowest UV index in Acton, Massachusetts, 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 ordinary individuals.Note: The daily high UV index of 2 during December translates into the following recommendations:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Acton, MA
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in December: 27.3°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Acton, MA
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Acton, MA
- Average wind speed in December: 8.2mph
The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in December
Acton, MA
- Average humidity in December: 77%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (70%).
Average rainfall in December
Acton, MA
- Average rainfall in December: 1.34"
The wettest month (with the highest rainfall) is October (1.65").
The driest month (with the least rainfall) is September (0.79").
Average rainfall days in December
Acton, MA
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is July (13.2 days).
The month with the least rainy days is February (5.4 days).
Average snowfall in December
Acton, MA
- Average snowfall in December: 2.32"
The month with the highest snowfall is February (2.87").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Acton, MA
- Average snowfall days in December: 4.2 days
The month with the highest number of snowfall days is January (6.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Acton, MA
- Average daylight in December: 9h and 6min
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 6min).
- Average sunshine in December: 4h and 48min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Acton, MA
- Average sunshine days in December: 19.1 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is April (15.8 days).
Average UV index in December
Acton, MA
- Average UV index in December: 2
The months with the highest UV index are June, 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
Acton, MA
- Average cloud cover in December: 47
The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Acton, MA
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).
