December weather forecast and climate
Williamsville, NY

Weather in December

The first month of the winter, December, is also a wintry month in Williamsville, New York, with average temperature fluctuating between 35.4°F (1.9°C) and 27°F (-2.8°C).

Temperature

In Williamsville, the average high-temperature decreases, from a chilly 45.5°F (7.5°C) in November, to a cold 35.4°F (1.9°C). The average low-temperature, in Williamsville, is 27°F (-2.8°C).

Humidity

In December, the average relative humidity is 84%.

Rainfall

In Williamsville, in December, it is raining for 8.5 days, with typically 1.22" (31mm) of accumulated precipitation. In Williamsville, during the entire year, the rain falls for 139.2 days and collects up to 14.84" (377mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Williamsville. In December, in Williamsville, New York, it is snowing for 13.2 days. Throughout December, 2.28" (58mm) of snow is accumulated. Throughout the year, there are 62.1 snowfall days, and 12.68" (322mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9.1h of daylight.

Sunshine

In Williamsville, the average sunshine is 2.7h.

UV index

January, February and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 1 in December transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in December in Williamsville?

In Williamsville, the average relative humidity in December is 84%.

How many days does it rain in December in Williamsville?

In December, in Williamsville, the rain falls for 8.5 days. Throughout December, 1.22" (31mm) of precipitation is accumulated.

How much does it snow in Williamsville in December?

In Williamsville, during December, snow falls for 13.2 days and regularly aggregates up to 2.28" (58mm) of snow.

What is the month with the shortest days in Williamsville?

December has the shortest days of the year in Williamsville, with an average of 9.1h of daylight.

How many hours of daylight does Williamsville have in December?

The average length of the day in December is 9.1h.

How many hours of sunshine does Williamsville have in December?

In Williamsville, New York, the average sunshine in December is 2.7h.

What is the month with the lowest UV index in Williamsville?

Months with the lowest UV index in Williamsville are January, February and December, with an average maximum UV index of 1.

How high is the UV index in December in Williamsville?

In December, the average daily maximum UV index in Williamsville, New York, is 1. A UV Index of 2, and less, symbolizes a low health threat from unsafe exposure to the Sun's UV rays.

Average temperature in December
Williamsville, NY

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).

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Average pressure in December
Williamsville, NY

Average pressure in December - Williamsville, NY
  • Average pressure in December: 30.06"

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in December
Williamsville, NY

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).

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Average humidity in December
Williamsville, NY

Average humidity in December - Williamsville, NY
  • Average humidity in December: 84%

Months with the highest relative humidity are January and February (86%).
Months with the lowest relative humidity are July and August (75%).

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Average rainfall in December
Williamsville, NY

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").

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Average rainfall days in December
Williamsville, NY

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).

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Average snowfall in December
Williamsville, NY

Average snowfall in December - Williamsville, NY
  • Average snowfall in December: 2.28"

Months with the highest snowfall are January and February (2.95").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Williamsville, NY

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).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Williamsville, NY

Average daylight in December / Average sunshine in December - Williamsville, NY
  • Average daylight in December: 9.1h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in December: 2.7h

Months with the most sunshine are July and August (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 2.4h).

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Average sunshine days in December
Williamsville, NY

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).

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Average UV index in December
Williamsville, NY

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).
Months with the lowest UV index are January, February and December (UV index 1).

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Average cloud cover in December
Williamsville, NY

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).

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Average visibility in December
Williamsville, NY

Average visibility in December - Williamsville, NY
  • Average visibility in December: 6mi

Months with the highest visibility are April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February and March (5mi).

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