December weather forecast
Upper Nyack, NY

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Weather in December

December, the first month of the winter in Upper Nyack, is also an icy month, with temperature in the range of an average high of 41°F (5°C) and an average low of 30.7°F (-0.7°C).

Temperature

The shift from November to December involves a decrease in the average high-temperature, dropping from a fresh 50.9°F (10.5°C) to a wintry 41°F (5°C). During December, Upper Nyack observes a consistent average nighttime temperature of 30.7°F (-0.7°C).

Humidity

February and December, with an average relative humidity of 77%, are the most humid months.

Rainfall

In Upper Nyack, in December, it is raining for 10.4 days, with typically 3.11" (79mm) of accumulated precipitation. Throughout the year, there are 151.8 rainfall days, and 30.79" (782mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Upper Nyack, New York, are January through April, October through December. In Upper Nyack, New York, during December, snow falls for 3.5 days and regularly aggregates up to 1.85" (47mm) of snow. Throughout the year, in Upper Nyack, there are 19 snowfall days, and 9.41" (239mm) of snow is accumulated.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year in Upper Nyack.
On the first day of the month, sunrise is at 7:02 am and sunset at 4:27 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:37 pm EST.

Sunshine

The average sunshine in December is 4.9h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Upper Nyack. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
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Frequently asked questions

How cold is December in Upper Nyack?

In Upper Nyack, 41°F (5°C) is the average high-temperature and 30.7°F (-0.7°C) is the average low-temperature during December. The average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in August is computed to be 87.8°F (31°C).

What are the most humid months in Upper Nyack?

The months with the highest humidity in Upper Nyack are February and December, with an average relative humidity of 77%.

What is the average humidity in December in Upper Nyack?

The average relative humidity in December is 77%.

How many days does it rain in December in Upper Nyack?

In December, in Upper Nyack, the rain falls for 10.4 days. Throughout December, 3.11" (79mm) of precipitation is accumulated.

How many days does it snow in December in Upper Nyack?

In Upper Nyack, New York, in December, during 3.5 snowfall days, 1.85" (47mm) of snow is typically accumulated.

What is the month with the shortest days in Upper Nyack?

December has the shortest days of the year, with an average of 9h and 18min of daylight.

How many hours of daylight does Upper Nyack have in December?

In December, the average day length in Upper Nyack is 9h and 16min.

When is the sunrise / sunset in December in Upper Nyack?

On the first day of December, sunrise is at 7:02 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:37 pm EST.

How many hours of sunshine does Upper Nyack have in December?

In Upper Nyack, the average sunshine duration in December is 4.9h.

What are the months with the lowest UV index in Upper Nyack?

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Upper Nyack?

The average daily maximum UV index in December in Upper Nyack, New York, is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from 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
Upper Nyack, NY

Average temperature in December - Upper Nyack, NY
  • Average high temperature in December: 41°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in December: 30.7°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).

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Average pressure in December
Upper Nyack, NY

Average pressure in December - Upper Nyack, NY
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
Upper Nyack, NY

Average wind speed in December - Upper Nyack, NY
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

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Average humidity in December
Upper Nyack, NY

Average humidity in December - Upper Nyack, NY
  • Average humidity in December: 77%

The months with the highest relative humidity are February and December (77%).
The month with the lowest relative humidity is August (70%).

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Average rainfall in December
Upper Nyack, NY

Average rainfall in December - Upper Nyack, NY
  • Average rainfall in December: 3.11"

The wettest month (with the highest rainfall) is July (3.35").
The driest month (with the least rainfall) is January (1.89").

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Average rainfall days in December
Upper Nyack, NY

Average rainfall days in December - Upper Nyack, NY
  • Average rainfall days in December: 10.4 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (6.8 days).

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Average snowfall in December
Upper Nyack, NY

Average snowfall in December - Upper Nyack, NY
  • Average snowfall in December: 1.85"

The month with the highest snowfall is March (2.8").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Upper Nyack, NY

Average snowfall days in December - Upper Nyack, NY
  • Average snowfall days in December: 3.5 days

The month with the highest number of snowfall days is February (5.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Upper Nyack, NY

Average daylight in December / Average sunshine in December - Upper Nyack, NY
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in December
Upper Nyack, NY

Average sunshine days in December - Upper Nyack, NY
  • Average sunshine days in December: 17.6 days

The months with the most sunshine days are January and November (20 days).
The month with the least sunshine days is July (10.9 days).

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Average UV index in December
Upper Nyack, NY

Average UV index in December - Upper Nyack, NY
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in December
Upper Nyack, NY

Average cloud cover in December - Upper Nyack, NY
  • Average cloud cover in December: 48

The months with the most cloud cover are February, March and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in December
Upper Nyack, NY

Average visibility in December - Upper Nyack, NY
  • Average visibility in December: 6mi

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

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Upper Nyack, New York, USA

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