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
The transition into December indicates a reduction in the average high-temperature, down to a cold 39°F (3.9°C) from November's chilly 49.1°F (9.5°C). During the December nights, an average temperature of 29.1°F (-1.6°C) is observed in Arlington.Humidity
The average relative humidity in December in Arlington, Massachusetts, is 76%.Rainfall
December is the month with the most rainfall. Rain falls for 9.5 days and accumulates 2.95" (75mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Arlington. In Arlington, during December, snow falls for 5.5 days and regularly aggregates up to 4.25" (108mm) of snow. In Arlington, during the entire year, snow falls for 29.6 days and aggregates up to 17.8" (452mm) of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:54 am and sunset at 4:12 pm. On the last day of December, in Arlington, sunrise is at 7:13 am and sunset at 4:21 pm EST.
Sunshine
In Arlington, Massachusetts, the average sunshine in December is 4.9h.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 low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 2 in December translates into this advice:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Frequently asked questions
Is it cold in Arlington during December?
What is the average humidity in December in Arlington?
What is the wettest month in Arlington?
How much does it rain in Arlington in December?
How much does it snow in Arlington in December?
What is the month with the shortest days in Arlington?
How many hours of daylight does Arlington have in December?
When are sunrise and sunset in December in Arlington?
How long on average sun shines in December in Arlington?
What is the month with the lowest UV index in Arlington?
What is the UV index intensity in December in Arlington?
Average temperature in December
Arlington, MA
- Average high temperature in December: 39°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in December: 29.1°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).
Average pressure in December
Arlington, 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
Arlington, MA
- Average wind speed in December: 8.8mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in December
Arlington, MA
- Average humidity in December: 76%
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (70%).
Average rainfall in December
Arlington, MA
- Average rainfall in December: 2.95"
The wettest month (with the highest rainfall) is December (2.95").
The driest month (with the least rainfall) is September (1.3").
Average rainfall days in December
Arlington, MA
- Average rainfall days in December: 9.5 days
The months with the highest number of rainy days are May and July (15.3 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in December
Arlington, MA
- Average snowfall in December: 4.25"
The month with the highest snowfall is February (4.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Arlington, MA
- Average snowfall days in December: 5.5 days
The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Arlington, 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 6min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Arlington, MA
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is April (13.3 days).
Average UV index in December
Arlington, 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
Arlington, MA
- Average cloud cover in December: 47
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Arlington, 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).
Arlington, Massachusetts, USA
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