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 decrease in the average high-temperature, shifting from a chilly 44.4°F (6.9°C) in November to a wintry 33.4°F (0.8°C). During the nights in December, Williamsville experiences a consistent average temperature of 22.6°F (-5.2°C).Humidity
The average relative humidity in December in Williamsville is 82%.Rainfall
In Williamsville, during December, the rain falls for 6.6 days and regularly aggregates up to 0.75" (19mm) of precipitation. In Williamsville, Vermont, during the entire year, the rain falls for 91.5 days and collects up to 7.8" (198mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In Williamsville, Vermont, in December, snow falls for 4.8 days, with typically accumulated 1.3" (33mm) of snow. Throughout the year, in Williamsville, there are 28.8 snowfall days, and 7.17" (182mm) of snow is accumulated.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year in Williamsville, Vermont.On the first day of the month, sunrise is at 7:02 am and sunset at 4:17 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:26 pm EST.
Sunshine
In Williamsville, the average sunshine in December is 4.9h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index in Williamsville. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The average daily UV index of 1 in December transforms into the following instructions:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Frequently asked questions
How cold is it in Williamsville in December?
What is the average humidity in December in Williamsville?
How much does it rain in Williamsville in December?
How much does it snow in Williamsville in December?
What is the month with the shortest days in Williamsville?
What is the average length of the day in December in Williamsville?
When are sunrise and sunset in December in Williamsville?
How long on average sun shines in December in Williamsville?
When is the lowest UV index in Williamsville?
What is the UV index intensity in December in Williamsville?
Average temperature in December
Williamsville, VT
- Average high temperature in December: 33.4°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in December: 22.6°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in December
Williamsville, VT
- Average pressure in December: 30.05"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Williamsville, VT
- Average wind speed in December: 7.4mph
The windiest months (with the highest average wind speed) are January, February and March (7.8mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Williamsville, VT
- Average humidity in December: 82%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
Williamsville, VT
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is November (0.87").
The driest month (with the least rainfall) is September (0.43").
Average rainfall days in December
Williamsville, VT
- Average rainfall days in December: 6.6 days
The month with the highest number of rainy days is May (10 days).
The months with the least rainy days are January and February (4.3 days).
Average snowfall in December
Williamsville, VT
- Average snowfall in December: 1.3"
The month with the highest snowfall is January (1.81").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Williamsville, VT
- Average snowfall days in December: 4.8 days
The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Williamsville, VT
- 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: 4h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in December
Williamsville, VT
- Average sunshine days in December: 21.2 days
The month with the most sunshine days is January (21.9 days).
The month with the least sunshine days is July (17.6 days).
Average UV index in December
Williamsville, VT
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Williamsville, VT
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Williamsville, VT
- 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).
Williamsville, Vermont, USA
Weather forecast for your location
2. Allow the app to use your location
