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 shift to December brings a decrease in the average high-temperature in Williston, falling from an icy 41.5°F (5.3°C) in November to a freezing cold 30.2°F (-1°C). In Williston, December is marked by an average low-temperature of 20.1°F (-6.6°C).Humidity
In December, the average relative humidity is 84%.Rainfall
In December, in Williston, the rain falls for 10.7 days. Throughout December, 2.28" (58mm) of precipitation is accumulated. In Williston, during the entire year, the rain falls for 161.7 days and collects up to 29.33" (745mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Williston. In Williston, Vermont, during December, snow falls for 18.1 days and regularly aggregates up to 7.83" (199mm) of snow. Throughout the year, there are 94.7 snowfall days, and 50.91" (1293mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 54min of daylight.On the first day of December, sunrise is at 7:09 am and sunset at 4:14 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:22 pm EST.
Sunshine
The average sunshine in December is 3.2h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In December, a regular UV index of 1 translates into these guidelines:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Williston?
What is the average humidity in December in Williston?
How much does it rain in Williston in December?
How much does it snow in Williston in December?
What is the month with the shortest days in Williston?
What is the average length of the day in December in Williston?
When are sunrise and sunset in December in Williston?
How long on average sun shines in December in Williston?
What are the months with the lowest UV index in Williston?
What is the UV index intensity in December in Williston?
Average temperature in December
Williston, VT
- Average high temperature in December: 30.2°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in December: 20.1°F
The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is January (12°F).
Average pressure in December
Williston, VT
- Average pressure in December: 30.05"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Williston, VT
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Williston, VT
- Average humidity in December: 84%
The months with the highest relative humidity are January and February (87%).
The months with the lowest relative humidity are April and May (76%).
Average rainfall in December
Williston, VT
- Average rainfall in December: 2.28"
The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in December
Williston, VT
- Average rainfall days in December: 10.7 days
The month with the highest number of rainy days is June (18 days).
The month with the least rainy days is February (6.2 days).
Average snowfall in December
Williston, VT
- Average snowfall in December: 7.83"
The month with the highest snowfall is February (11.73").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Williston, VT
- Average snowfall days in December: 18.1 days
The month with the highest number of snowfall days is January (20.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Williston, VT
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 3h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 2h and 48min).
Average sunshine days in December
Williston, VT
- Average sunshine days in December: 8.3 days
The month with the most sunshine days is September (15.9 days).
The month with the least sunshine days is February (6.8 days).
Average UV index in December
Williston, VT
- 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 and December (UV index 1).
Average cloud cover in December
Williston, VT
- Average cloud cover in December: 68
The month with the most cloud cover is February (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in December
Williston, VT
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February and March (4mi).
Williston, Vermont, USA
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