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
Onset of December comes with a temperature decline, the average high falling from a chilly 45.5°F (7.5°C) in November to a wintry 35.4°F (1.9°C). December nights in Williamsville, New York, register a minor temperature decline, steadying at a freezing cold 27°F (-2.8°C).Humidity
The average relative humidity in December in Williamsville is 84%.Rainfall
In Williamsville, New York, during December, the rain falls for 8.5 days and regularly aggregates up to 1.22" (31mm) of precipitation. Throughout the year, in Williamsville, there are 139.2 rainfall days, and 14.84" (377mm) of precipitation is accumulated.Snowfall
Months with snowfall in Williamsville, New York, are January through May, October through December. In December, it is snowing for 13.2 days. Throughout December, 2.28" (58mm) of snow is accumulated. In Williamsville, during the entire year, snow falls for 62.1 days and aggregates up to 12.68" (322mm) of snow.Daylight
December has the shortest days of the year in Williamsville, with an average of 9h and 6min of daylight.On the first day of December in Williamsville, sunrise is at 7:27 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 4:50 pm EST.
Sunshine
In Williamsville, New York, the average sunshine in December is 2.7h.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 value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 1 in December, converts into the following recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Williamsville?
What is the average humidity in December in Williamsville?
How many days does it rain in December in Williamsville?
How many days does it snow in December in Williamsville?
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 many hours of sunshine does Williamsville have in December?
What are the months with the lowest UV index in Williamsville?
How high is the UV index in December in Williamsville?
Average temperature in December
Williamsville, NY
- Average high temperature in December: 35.4°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in December: 27°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 (18.7°F).
Average pressure in December
Williamsville, NY
- Average pressure in December: 30.06"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
Williamsville, NY
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in December
Williamsville, NY
- Average humidity in December: 84%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are July and August (75%).
Average rainfall in December
Williamsville, NY
- Average rainfall in December: 1.22"
The wettest month (with the highest rainfall) is July (1.61").
The driest month (with the least rainfall) is September (0.91").
Average rainfall days in December
Williamsville, NY
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (6.4 days).
Average snowfall in December
Williamsville, NY
- Average snowfall in December: 2.28"
The months with the highest snowfall are January and February (2.95").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Williamsville, NY
- Average snowfall days in December: 13.2 days
The month with the highest number of snowfall days is January (15.8 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, 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 24min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in December
Williamsville, NY
- Average sunshine days in December: 12.3 days
The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is February (10.2 days).
Average UV index in December
Williamsville, NY
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in December
Williamsville, NY
- Average cloud cover in December: 72
The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Williamsville, NY
- Average visibility in December: 6mi
The months with the highest visibility are April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and March (5mi).
Williamsville, New York, USA
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