December weather forecast
Thiells, NY

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Weather in December

The first month of the winter, December, is also a wintry month in Thiells, New York, with an average temperature varying between 40.3°F (4.6°C) and 29.3°F (-1.5°C).

Temperature

With the onset of December, Thiells experiences a modest temperature adjustment, with the average high-temperature receding from a cool 50°F (10°C) in November to a wintry 40.3°F (4.6°C). The nights of December anticipate an average low-temperature of 29.3°F (-1.5°C).

Humidity

In December, the average relative humidity is 78%.

Rainfall

In Thiells, in December, during 10.1 rainfall days, 3.19" (81mm) of precipitation is typically accumulated. Throughout the year, there are 152.8 rainfall days, and 30.79" (782mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Thiells, during December, snow falls for 4.4 days and regularly aggregates up to 2.2" (56mm) of snow. In Thiells, during the entire year, snow falls for 22.6 days and aggregates up to 12.28" (312mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
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 7:21 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. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.

Frequently asked questions

Is it cold during December?

An average high-temperature, in December, in Thiells, is 40.3°F (4.6°C) and the average low-temperature is 29.3°F (-1.5°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in August is calculated to be 87.8°F (31°C).

What is the average humidity in December?

In Thiells, the average relative humidity in December is 78%.

How much does it rain in December?

In Thiells, New York, during December, the rain falls for 10.1 days and regularly aggregates up to 3.19" (81mm) of precipitation.

How many days does it snow in December?

In Thiells, in December, snow falls for 4.4 days, with typically accumulated 2.2" (56mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

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

When are sunrise and sunset in December?

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 7:21 am and sunset at 4:37 pm EST.

How many hours of sunshine does Thiells have in December?

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

What is the month with 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 reading in December?

In Thiells, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability 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
Thiells, NY

Average temperature in December - Thiells, NY
  • Average high temperature in December: 40.3°F

The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (34.7°F).

  • Average low temperature in December: 29.3°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

Average pressure in December
Thiells, NY

Average pressure in December - Thiells, 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
Thiells, NY

Average wind speed in December - Thiells, NY
  • Average wind speed in December: 6.9mph

The windiest months (with the highest average wind speed) are January and March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

Average humidity in December
Thiells, NY

Average humidity in December - Thiells, NY
  • Average humidity in December: 78%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (72%).

Average rainfall in December
Thiells, NY

Average rainfall in December - Thiells, NY
  • Average rainfall in December: 3.19"

The wettest month (with the highest rainfall) is July (3.23").
The driest month (with the least rainfall) is September (1.89").

Average rainfall days in December
Thiells, NY

Average rainfall days in December - Thiells, NY
  • Average rainfall days in December: 10.1 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (7.3 days).

Average snowfall in December
Thiells, NY

Average snowfall in December - Thiells, NY
  • Average snowfall in December: 2.2"

The month with the highest snowfall is March (3.46").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Thiells, NY

Average snowfall days in December - Thiells, NY
  • Average snowfall days in December: 4.4 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
Thiells, NY

Average daylight in December / Average sunshine in December - Thiells, 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
Thiells, NY

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

The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (11.5 days).

Average UV index in December
Thiells, NY

Average UV index in December - Thiells, 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).

Average cloud cover in December
Thiells, NY

Average cloud cover in December - Thiells, 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).

Average visibility in December
Thiells, NY

Average visibility in December - Thiells, 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).

Thiells, New York, USA

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