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
December brings a minor decrease, with the average high-temperature reducing from a chilly 47.3°F (8.5°C) in November to a cold 37.4°F (3°C). During the month of December, an average low-temperature of 26.6°F (-3°C) is recorded.Humidity
The average relative humidity in December is 78%.Rainfall
The month with the most rainfall in Boylston is December, when the rain falls for 10.7 days and typically aggregates up to 2.91" (74mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Boylston, in December, snow falls for 5.6 days, with typically accumulated 4.33" (110mm) of snow. Throughout the year, there are 36.5 snowfall days, and 23.82" (605mm) of snow is accumulated.Daylight
The month with the shortest days in Boylston, Massachusetts, is December, with an average of 9h and 6min of daylight.On the first day of December in Boylston, sunrise is at 6:57 am and sunset at 4:15 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:24 pm EST.
Sunshine
In Boylston, the average sunshine in December 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 reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.Note: In December, an average UV index of 2 transforms into the following instructions:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Opt for tightly woven and loose clothing to enhance protection from the Sun. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
How cold is it in Boylston in December?
What is the average humidity in December in Boylston?
What is the wettest month in Boylston?
How many days does it rain in December in Boylston?
How much does it snow in Boylston in December?
What is the month with the shortest days in Boylston?
How many hours of daylight does Boylston have in December?
When is the sunrise / sunset in December in Boylston?
How many hours of sunshine does Boylston have in December?
What is the month with the lowest UV index in Boylston?
How high is the UV index in December in Boylston?
Average temperature in December
Boylston, MA
- Average high temperature in December: 37.4°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in December: 26.6°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Boylston, MA
- Average pressure in December: 30.04"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
Boylston, 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
Boylston, MA
- Average humidity in December: 78%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (71%).
Average rainfall in December
Boylston, MA
- 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 (1.57").
Average rainfall days in December
Boylston, MA
- Average rainfall days in December: 10.7 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in December
Boylston, MA
- Average snowfall in December: 4.33"
The month with the highest snowfall is February (6.1").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Boylston, MA
- Average snowfall days in December: 5.6 days
The month with the highest number of snowfall days is February (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Boylston, 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 12min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Boylston, MA
- Average sunshine days in December: 16.5 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is July (12.8 days).
Average UV index in December
Boylston, 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
Boylston, 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 34).
Average visibility in December
Boylston, MA
- Average visibility in December: 6mi
The months with the highest visibility are March, April, October, November and December (6mi).
The months with the lowest visibility are January, February, May, June, July, August and September (5mi).
Boylston, Massachusetts, USA
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