December weather forecast
Yorktown, NY

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Weather in December

December, the first month of the winter in Yorktown, is still a cold month, with an average temperature fluctuating between 39.9°F (4.4°C) and 28.8°F (-1.8°C).

Temperature

The start of December signals a decrease in the average high-temperature, transitioning from a chilly 49.5°F (9.7°C) in November to a cold 39.9°F (4.4°C). An average nighttime temperature of 28.8°F (-1.8°C) is noted during the month of December.

Humidity

February, October and December, with an average relative humidity of 79%, are the most humid months.

Rainfall

In Yorktown, during December, the rain falls for 9.5 days and regularly aggregates up to 3.11" (79mm) of precipitation. In Yorktown, during the entire year, the rain falls for 148.4 days and collects up to 30.55" (776mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Yorktown, in December, snow falls for 4.7 days, with typically accumulated 2.32" (59mm) of snow. In Yorktown, during the entire year, snow falls for 24.4 days and aggregates up to 12.87" (327mm) of snow.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:02 am and sunset at 4:26 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:36 pm EST.

Sunshine

In December, the average sunshine is 4.9h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum UV index of 2 during December leads to these instructions:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Updated: Jun 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

An average high-temperature, in December, in Yorktown, is 39.9°F (4.4°C) and the average low-temperature is 28.8°F (-1.8°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, in August is estimated at 87.8°F (31°C).

What are the most humid months?

February, October and December, with an average relative humidity of 79%, are most humid months.

What is the average humidity in December?

In Yorktown, New York, the average relative humidity in December is 79%.

How much does it rain in December?

In Yorktown, in December, during 9.5 rainfall days, 3.11" (79mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Yorktown, in December, during 4.7 snowfall days, 2.32" (59mm) of snow is typically accumulated.

What is the month with the shortest days?

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

What is the average length of the day in December?

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

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:36 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 4.9h.

When is the lowest UV index?

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

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from exposure to the Sun's UV radiation.
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
Yorktown, NY

Average temperature in December - Yorktown, NY
  • Average high temperature in December: 39.9°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in December: 28.8°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).

Average pressure in December
Yorktown, NY

Average pressure in December - Yorktown, 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).

Average wind speed in December
Yorktown, NY

Average wind speed in December - Yorktown, NY
  • Average wind speed in December: 6.8mph

The windiest months (with the highest average wind speed) are January and March (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

Average humidity in December
Yorktown, NY

Average humidity in December - Yorktown, NY
  • Average humidity in December: 79%

The months with the highest relative humidity are February, October and December (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall in December
Yorktown, NY

Average rainfall in December - Yorktown, NY
  • Average rainfall in December: 3.11"

The wettest month (with the highest rainfall) is July (3.31").
The driest month (with the least rainfall) is February (1.81").

Average rainfall days in December
Yorktown, NY

Average rainfall days in December - Yorktown, NY
  • Average rainfall days in December: 9.5 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (6.5 days).

Average snowfall in December
Yorktown, NY

Average snowfall in December - Yorktown, NY
  • Average snowfall in December: 2.32"

The month with the highest snowfall is March (3.39").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Yorktown, NY

Average snowfall days in December - Yorktown, NY
  • Average snowfall days in December: 4.7 days

The month with the highest number of snowfall days is February (6.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Yorktown, 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).

Average sunshine days in December
Yorktown, NY

Average sunshine days in December - Yorktown, NY
  • Average sunshine days in December: 17.5 days

The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is July (11.4 days).

Average UV index in December
Yorktown, NY

Average UV index in December - Yorktown, NY
  • Average UV index in December: 2

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

Average cloud cover in December
Yorktown, NY

Average cloud cover in December - Yorktown, 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 33).

Average visibility in December
Yorktown, NY

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

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

Yorktown, New York, USA

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