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
December
Weather in December
Temperature
The start of December involves a temperature drop, moving from a chilly 43.9°F (6.6°C) in November to a cold 34.3°F (1.3°C). Boston consistently logs a low temperature averaging a freezing cold 25.7°F (-3.5°C) during December, a modest drop from daytime temperatures.Humidity
In December, the average relative humidity is 87%.Rainfall
In Boston, in December, during 8.9 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. Throughout the year, there are 151.9 rainfall days, and 19.21" (488mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Boston, in December, during 14.4 snowfall days, 3.7" (94mm) of snow is typically accumulated. In Boston, during the entire year, snow falls for 71.6 days and aggregates up to 19.21" (488mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:25 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 4:51 pm EST.
Sunshine
In December, the average sunshine is 2.6h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 1 suggests these recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How many days does it rain in December in Boston?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What are the months with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Boston, NY
- Average high temperature in December: 34.3°F
The warmest month (with the highest average high temperature) is July (77.2°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in December: 25.7°F
The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in December
Boston, NY
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Boston, NY
- Average wind speed in December: 10.2mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in December
Boston, NY
- Average humidity in December: 87%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is May (79%).
Average rainfall in December
Boston, NY
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is September (1.22").
Average rainfall days in December
Boston, NY
- Average rainfall days in December: 8.9 days
The month with the highest number of rainy days is October (17.2 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in December
Boston, NY
- Average snowfall in December: 3.7"
The month with the highest snowfall is February (4.61").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Boston, NY
- Average snowfall days in December: 14.4 days
The month with the highest number of snowfall days is January (16.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Boston, NY
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 2h and 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in December
Boston, NY
- Average sunshine days in December: 10.1 days
The month with the most sunshine days is September (14 days).
The month with the least sunshine days is January (8.6 days).
Average UV index in December
Boston, NY
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in December
Boston, NY
- Average cloud cover in December: 74
The month with the most cloud cover is January (Cloud cover 78).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Boston, NY
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).