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
Somerville's transition into December involves a gentle shift in temperature, receding from a fresh 50.9°F (10.5°C) in November to a cold 42.3°F (5.7°C). Somerville experiences an average low-temperature of 30.6°F (-0.8°C) in month of December.Humidity
February, October and December, with an average relative humidity of 79%, are the most humid months in Somerville.Rainfall
The month with the most rainfall is December, when the rain falls for 10.9 days and typically aggregates up to 2.91" (74mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Somerville. In Somerville, in December, during 4 snowfall days, 1.46" (37mm) of snow is typically accumulated. In Somerville, New Jersey, during the entire year, snow falls for 23.8 days and aggregates up to 9.53" (242mm) of snow.Daylight
December has the shortest days of the year in Somerville, with an average of 9h and 18min of daylight.On the first day of December in Somerville, sunrise is at 7:03 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:41 pm EST.
Sunshine
In December, the average sunshine is 4.8h.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 low threat to health from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 2 in December translates into this advice:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Frequently asked questions
Is it cold in Somerville during December?
What are the most humid months in Somerville?
What is the average humidity in December in Somerville?
What is the rainiest month in Somerville?
How many days does it rain in December in Somerville?
How much does it snow in Somerville in December?
What is the month with the shortest days in Somerville?
What is the average length of the day in December in Somerville?
What time are sunrise and sunset in December in Somerville?
How long on average sun shines in December in Somerville?
What is the month with the lowest UV index in Somerville?
What is the UV index intensity in December in Somerville?
Average temperature in December
Somerville, NJ
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (35.6°F).
- Average low temperature in December: 30.6°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure in December
Somerville, NJ
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Somerville, NJ
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Somerville, NJ
- Average humidity in December: 79%
The months with the highest relative humidity are February, October and December (79%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
Somerville, NJ
- Average rainfall in December: 2.91"
The wettest month (with the highest rainfall) is December (2.91").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in December
Somerville, NJ
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (9 days).
Average snowfall in December
Somerville, NJ
- Average snowfall in December: 1.46"
The month with the highest snowfall is March (2.83").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Somerville, NJ
- Average snowfall days in December: 4 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Somerville, NJ
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Somerville, NJ
- Average sunshine days in December: 16.3 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is June (11.7 days).
Average UV index in December
Somerville, NJ
- 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
Somerville, NJ
- Average cloud cover in December: 49
The months with the most cloud cover are February and December (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 34).
Average visibility in December
Somerville, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Somerville, New Jersey, USA
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