December weather forecast
Ulster, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Ulster, Pennsylvania, with temperature in the range of an average low of 25.5°F (-3.6°C) and an average high of 35.2°F (1.8°C).

Temperature

Onset of December witnesses a reduction in the average high-temperature, falling from a frosty 45.3°F (7.4°C) in November to a cold 35.2°F (1.8°C). During December, Ulster sees a mean low-temperature of 25.5°F (-3.6°C).

Humidity

The average relative humidity in December is 84%.

Rainfall

In Ulster, in December, during 11.5 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. In Ulster, during the entire year, the rain falls for 164.7 days and collects up to 24.09" (612mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In December, it is snowing for 12.7 days. Throughout December, 3.54" (90mm) of snow is accumulated. Throughout the year, there are 67.5 snowfall days, and 20.75" (527mm) of snow is accumulated.

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 7:14 am and sunset at 4:35 pm. On the last day of December, sunrise is at 7:33 am and sunset at 4:45 pm EST.

Sunshine

The months with the least sunshine in Ulster are January, February and December, with an average of 3.2h of sunshine.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the UV index of 1 transforms into the following advice:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.

Frequently asked questions

How cold is December?

The average high-temperature, in December, in Ulster, is 35.2°F (1.8°C), while the average low-temperature is 25.5°F (-3.6°C).

What is the average humidity in December?

The average relative humidity in December in Ulster is 84%.

How many days does it rain in December?

In Ulster, in December, during 11.5 rainfall days, 1.61" (41mm) of precipitation is typically accumulated.

How much does it snow in December?

In Ulster, in December, during 12.7 snowfall days, 3.54" (90mm) 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 12min of daylight.

How many hours of daylight does Ulster have in December?

The average day length in December is 9h and 12min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:14 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 4:45 pm EST.

What is the month with the least sunshine?

The months with the least sunshine are January, February and December, with an average of 3.2h of sunshine.

How long on average sun shines in December?

The average sunshine duration in December is 3.2h.

When is the lowest UV index?

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes 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
Ulster, PA

Average temperature in December - Ulster, PA
  • Average high temperature in December: 35.2°F

The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (29.3°F).

  • Average low temperature in December: 25.5°F

The month with the highest average low temperature is July (57.6°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).

Average pressure in December
Ulster, PA

Average pressure in December - Ulster, PA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Ulster, PA

Average wind speed in December - Ulster, PA
  • Average wind speed in December: 8.3mph

The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in December
Ulster, PA

Average humidity in December - Ulster, PA
  • Average humidity in December: 84%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April, June and July (78%).

Average rainfall in December
Ulster, PA

Average rainfall in December - Ulster, PA
  • Average rainfall in December: 1.61"

The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is January (1.38").

Average rainfall days in December
Ulster, PA

Average rainfall days in December - Ulster, PA
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.3 days).

Average snowfall in December
Ulster, PA

Average snowfall in December - Ulster, PA
  • Average snowfall in December: 3.54"

The month with the highest snowfall is February (5.51").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Ulster, PA

Average snowfall days in December - Ulster, PA
  • Average snowfall days in December: 12.7 days

The month with the highest number of snowfall days is January (15.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Ulster, PA

Average daylight in December / Average sunshine in December - Ulster, PA
  • 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: 3h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 12min).

Average sunshine days in December
Ulster, PA

Average sunshine days in December - Ulster, PA
  • Average sunshine days in December: 9.4 days

The month with the most sunshine days is September (14.4 days).
The month with the least sunshine days is February (8.8 days).

Average UV index in December
Ulster, PA

Average UV index in December - Ulster, PA
  • 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 and December (UV index 1).

Average cloud cover in December
Ulster, PA

Average cloud cover in December - Ulster, PA
  • Average cloud cover in December: 68

The months with the most cloud cover are January, February and December (Cloud cover 68).
The months with the least cloud cover are July and August (Cloud cover 39).

Average visibility in December
Ulster, PA

Average visibility in December - Ulster, PA
  • Average visibility in December: 5mi

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

Ulster, Pennsylvania, USA

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