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 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
In Swansea, the average high-temperature in December slightly decreases from a fresh 50.9°F (10.5°C) in November to a wintry 42.1°F (5.6°C). Throughout December, the temperature in Swansea tends to fall to a consistent average low of 31.8°F (-0.1°C).Humidity
In December, the average relative humidity is 76%.Rainfall
In December, in Swansea, Massachusetts, the rain falls for 9.6 days. Throughout December, 1.73" (44mm) of precipitation is accumulated. In Swansea, during the entire year, the rain falls for 135.4 days and collects up to 18.31" (465mm) of precipitation.Snowfall
January through May, November and December are months with snowfall in Swansea, Massachusetts. In Swansea, in December, during 3.3 snowfall days, 1.42" (36mm) of snow is typically accumulated. Throughout the year, in Swansea, there are 21.2 snowfall days, and 7.17" (182mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 6:53 am and sunset at 4:15 pm. On the last day of December, sunrise is at 7:11 am and sunset at 4:24 pm EST.
Sunshine
The months with the least sunshine in Swansea are February and December, with an average of 4.9h of sunshine.UV index
January through March and December, with an average maximum UV index of 2, are months with the lowest UV index in Swansea. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 2 during December leads to these instructions:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Frequently asked questions
Is it cold in Swansea during December?
What is the average humidity in December in Swansea?
How much does it rain in Swansea in December?
How many days does it snow in December in Swansea?
What is the month with the shortest days in Swansea?
What is the average length of the day in December in Swansea?
When are sunrise and sunset in December in Swansea?
What are the months with the least sunshine in Swansea?
How many hours of sunshine does Swansea have in December?
When is the lowest UV index in Swansea?
What is the UV index intensity in December in Swansea?
Average temperature in December
Swansea, MA
- Average high temperature in December: 42.1°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in December: 31.8°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in December
Swansea, 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 (29.93"Hg).
Average wind speed in December
Swansea, MA
- Average wind speed in December: 10.3mph
The windiest months (with the highest average wind speed) are January, February and March (10.9mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in December
Swansea, MA
- Average humidity in December: 76%
The month with the highest relative humidity is June (80%).
The month with the lowest relative humidity is April (73%).
Average rainfall in December
Swansea, MA
- Average rainfall in December: 1.73"
The wettest month (with the highest rainfall) is October (1.97").
The driest month (with the least rainfall) is September (1.06").
Average rainfall days in December
Swansea, MA
- Average rainfall days in December: 9.6 days
The month with the highest number of rainy days is July (15 days).
The month with the least rainy days is February (6.9 days).
Average snowfall in December
Swansea, MA
- Average snowfall in December: 1.42"
The month with the highest snowfall is March (2.13").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Swansea, MA
- Average snowfall days in December: 3.3 days
The month with the highest number of snowfall days is January (5.9 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Swansea, 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 5min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).
Average sunshine days in December
Swansea, MA
- Average sunshine days in December: 17.6 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is April (13.6 days).
Average UV index in December
Swansea, 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 and December (UV index 2).
Average cloud cover in December
Swansea, MA
- Average cloud cover in December: 46
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Swansea, 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).
Swansea, Massachusetts, USA
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