December weather forecast
Williston, NY

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Weather in December

December, the first month of the winter in Williston, is still a cold month, with temperature in the range of an average high of 34.9°F (1.6°C) and an average low of 26.2°F (-3.2°C).

Temperature

The start of December signals a decrease in the average high-temperature, transitioning from a chilly 45.5°F (7.5°C) in November to a cold 34.9°F (1.6°C). Williston's evenings during December maintain an average temperature of 26.2°F (-3.2°C), aligning closely with the daytime temperatures.

Humidity

The average relative humidity in December is 85%.

Rainfall

In Williston, New York, in December, it is raining for 10 days, with typically 1.65" (42mm) of accumulated precipitation. In Williston, New York, during the entire year, the rain falls for 161.8 days and collects up to 21.93" (557mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Williston. In Williston, in December, during 15.8 snowfall days, 4.41" (112mm) of snow is typically accumulated. In Williston, during the entire year, snow falls for 78.6 days and aggregates up to 25.24" (641mm) of snow.

Daylight

With an average of 9h and 6min of daylight, December has the shortest days of the year.
On the first day of December in Williston, sunrise is at 7:25 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 4:50 pm EST.

Sunshine

In Williston, the average sunshine in December is 2.7h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Williston. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 1 translates into the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
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Frequently asked questions

How cold is it in Williston in December?

An average high-temperature, in December, in Williston, is 34.9°F (1.6°C) and the average low-temperature is 26.2°F (-3.2°C).

What is the average humidity in December in Williston?

In Williston, New York, the average relative humidity in December is 85%.

How many days does it rain in December in Williston?

In December, the rain falls for 10 days. Throughout December, 1.65" (42mm) of precipitation is accumulated.

How many days does it snow in December in Williston?

In Williston, during December, snow falls for 15.8 days and regularly aggregates up to 4.41" (112mm) of snow.

What is the month with the shortest days in Williston?

December has the shortest days of the year in Williston, New York, with an average of 9h and 6min of daylight.

How many hours of daylight does Williston have in December?

In December, the average day length in Williston is 9h and 5min.

When is the sunrise / sunset in December in Williston?

In December, on the first day of the month, sunrise is at 7:25 am and sunset at 4:41 pm. On the last day of the month, in Williston, New York, sunrise is at 7:44 am and sunset at 4:50 pm EST.

How many hours of sunshine does Williston have in December?

The average sunshine duration in December is 2.7h.

What are the months with the lowest UV index in Williston?

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Williston.

How high is the UV index in December in Williston?

The average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Williston, NY

Average temperature in December - Williston, NY
  • Average high temperature in December: 34.9°F

The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (28.9°F).

  • Average low temperature in December: 26.2°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (18.1°F).

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Average pressure in December
Williston, NY

Average pressure in December - Williston, 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).

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Average wind speed in December
Williston, NY

Average wind speed in December - Williston, NY
  • Average wind speed in December: 9.3mph

The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).

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Average humidity in December
Williston, NY

Average humidity in December - Williston, NY
  • Average humidity in December: 85%

The months with the highest relative humidity are January and February (87%).
The months with the lowest relative humidity are May, July and August (77%).

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Average rainfall in December
Williston, NY

Average rainfall in December - Williston, NY
  • Average rainfall in December: 1.65"

The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is September (1.34").

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Average rainfall days in December
Williston, NY

Average rainfall days in December - Williston, NY
  • Average rainfall days in December: 10 days

The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is February (6.8 days).

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Average snowfall in December
Williston, NY

Average snowfall in December - Williston, NY
  • Average snowfall in December: 4.41"

The month with the highest snowfall is February (6.61").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Williston, NY

Average snowfall days in December - Williston, NY
  • Average snowfall days in December: 15.8 days

The month with the highest number of snowfall days is January (19 days).
The 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
Williston, NY

Average daylight in December / Average sunshine in December - Williston, 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 month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).

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Average sunshine days in December
Williston, NY

Average sunshine days in December - Williston, NY
  • Average sunshine days in December: 8.2 days

The month with the most sunshine days is June (13.4 days).
The month with the least sunshine days is February (6.7 days).

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Average UV index in December
Williston, NY

Average UV index in December - Williston, 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 and December (UV index 1).

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Average cloud cover in December
Williston, NY

Average cloud cover in December - Williston, NY
  • Average cloud cover in December: 72

The month with the most cloud cover is January (Cloud cover 78).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in December
Williston, NY

Average visibility in December - Williston, NY
  • Average visibility in December: 5mi

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

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Williston, New York, USA

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