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
With December's arrival, Westfield sees a decrease in average high-temperatures, moving from a chilly 46.8°F (8.2°C) in November to a wintry 36.5°F (2.5°C). In December, Westfield records an average nighttime temperature of 25.5°F (-3.6°C).Humidity
In Westfield, the average relative humidity in December is 80%.Rainfall
The months with the most rainfall are October and December, with an average 3.27" (83mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Westfield, in December, snow falls for 6.5 days, with typically accumulated 4.33" (110mm) of snow. Throughout the year, in Westfield, there are 37.4 snowfall days, and 21.77" (553mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:00 am and sunset at 4:20 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:29 pm EST.
Sunshine
In Westfield, the average sunshine in December is 4.8h.UV index
The months with the lowest UV index in Westfield 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 threat to health from exposure to the Sun's UV rays for average individuals.Note: A maximum high daily UV index of 2 during December translates into the following directions:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
What is the rainiest month?
How many days does it rain in December?
How much does it snow in Westfield in December?
What is the month with the shortest days?
How many hours of daylight does Westfield have in December?
What time are sunrise and sunset in December?
How many hours of sunshine does Westfield have in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Westfield, MA
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in December: 25.5°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in December
Westfield, MA
- Average pressure in December: 30.05"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
Westfield, MA
- Average wind speed in December: 7.8mph
The windiest months (with the highest average wind speed) are January, February and March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Westfield, MA
- Average humidity in December: 80%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (72%).
Average rainfall in December
Westfield, MA
- Average rainfall in December: 3.27"
The wettest months (with the highest rainfall) are October and December (3.27").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in December
Westfield, MA
- Average rainfall days in December: 11.5 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is January (8.9 days).
Average snowfall in December
Westfield, MA
- Average snowfall in December: 4.33"
The month with the highest snowfall is February (5.59").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Westfield, MA
- Average snowfall days in December: 6.5 days
The month with the highest number of snowfall days is February (9.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Westfield, 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 months with the most sunshine are July and August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Westfield, MA
- Average sunshine days in December: 14.6 days
The month with the most sunshine days is January (16.2 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in December
Westfield, MA
- Average UV index in December: 2
The month with the highest UV index is June (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
Westfield, MA
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Westfield, MA
- Average visibility in December: 6mi
The months with the highest visibility are April, November and December (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September and October (5mi).
Westfield, Massachusetts, USA
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