December weather forecast
Glen Castle, NY

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Weather in December

The first month of the winter, December, is also an icy month in Glen Castle, New York, with temperature in the range of an average high of 33.3°F (0.7°C) and an average low of 23.9°F (-4.5°C).

Temperature

Onset of December witnesses a reduction in the average high-temperature, falling from a frosty 43.7°F (6.5°C) in November to a cold 33.3°F (0.7°C). The month of December records an average low-temperature of 23.9°F (-4.5°C) in Glen Castle.

Humidity

In December, the average relative humidity is 86%.

Rainfall

In Glen Castle, in December, during 11.2 rainfall days, 2.76" (70mm) of precipitation is typically accumulated. In Glen Castle, during the entire year, the rain falls for 173.5 days and collects up to 35.67" (906mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 18.2 days. Throughout December, 8.54" (217mm) of snow is accumulated. In Glen Castle, during the entire year, snow falls for 94.8 days and aggregates up to 48.82" (1240mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 12min of daylight.
On the first day of the month, sunrise is at 7:13 am and sunset at 4:32 pm. On the last day of December, sunrise is at 7:32 am and sunset at 4:41 pm EST.

Sunshine

In December, the average sunshine is 2.9h.

UV index

January, February and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 1 during December translates into these guidelines:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature, in December, in Glen Castle, records 33.3°F (0.7°C), while the low-temperature is 23.9°F (-4.5°C).

What is the average humidity in December?

The average relative humidity in December is 86%.

How much does it rain in December?

In December, the rain falls for 11.2 days. Throughout December, 2.76" (70mm) of precipitation is accumulated.

How many days does it snow in December?

In Glen Castle, during December, snow falls for 18.2 days and regularly aggregates up to 8.54" (217mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 12min of daylight.

What is the average length of the day in December?

In December, the average day length is 9h and 10min.

When are sunrise and sunset in December in Glen Castle?

In December, on the first day of the month, sunrise is at 7:13 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:41 pm EST.

How many hours of sunshine does Glen Castle have in December?

The average sunshine duration in December is 2.9h.

What are the months with the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 1. A UV Index value of 2, and less, symbolizes 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
Glen Castle, NY

Average temperature in December - Glen Castle, NY
  • Average high temperature in December: 33.3°F

The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (27.3°F).

  • Average low temperature in December: 23.9°F

The month with the highest average low temperature is July (57.4°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).

Average pressure in December
Glen Castle, NY

Average pressure in December - Glen Castle, NY
  • Average pressure in December: 30.08"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Glen Castle, NY

Average wind speed in December - Glen Castle, NY
  • Average wind speed in December: 8.9mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

Average humidity in December
Glen Castle, NY

Average humidity in December - Glen Castle, NY
  • Average humidity in December: 86%

The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are April, May, June and July (80%).

Average rainfall in December
Glen Castle, NY

Average rainfall in December - Glen Castle, NY
  • Average rainfall in December: 2.76"

The wettest month (with the highest rainfall) is June (3.58").
The driest months (with the least rainfall) are January and November (2.4").

Average rainfall days in December
Glen Castle, NY

Average rainfall days in December - Glen Castle, NY
  • Average rainfall days in December: 11.2 days

The month with the highest number of rainy days is July (19.3 days).
The month with the least rainy days is February (7.3 days).

Average snowfall in December
Glen Castle, NY

Average snowfall in December - Glen Castle, NY
  • Average snowfall in December: 8.54"

The month with the highest snowfall is February (10.87").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Glen Castle, NY

Average snowfall days in December - Glen Castle, NY
  • Average snowfall days in December: 18.2 days

The month with the highest number of snowfall days is January (21.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Glen Castle, NY

Average daylight in December / Average sunshine in December - Glen Castle, NY
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 2h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 2h and 30min).

Average sunshine days in December
Glen Castle, NY

Average sunshine days in December - Glen Castle, NY
  • Average sunshine days in December: 6.5 days

The month with the most sunshine days is September (14.3 days).
The month with the least sunshine days is February (5.7 days).

Average UV index in December
Glen Castle, NY

Average UV index in December - Glen Castle, NY
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).

Average cloud cover in December
Glen Castle, NY

Average cloud cover in December - Glen Castle, NY
  • Average cloud cover in December: 71

The month with the most cloud cover is February (Cloud cover 74).
The month with the least cloud cover is July (Cloud cover 39).

Average visibility in December
Glen Castle, NY

Average visibility in December - Glen Castle, NY
  • Average visibility in December: 5mi

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January and February (4mi).

Glen Castle, New York, USA

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