December weather forecast
New Castle, PA

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Weather in December

The arrival of December symbolizes the onset of winter in New Castle, which is marked by chilly temperatures, minimal daylight, and increased snowfall. The disparity in December's average high temperature from November's 47.7°F (8.7°C) to a much colder 38.1°F (3.4°C), reinforces the arrival of the frosty season. As snowfall covers the surroundings in a blanket of white, holiday lights add a cheerful glow to the city. This is a month where the festive ambiance, crisp winter air, and the lure of winter sports make New Castle a winter wonderland.

Temperature

The average high-temperature drops in December, from November's frosty 47.7°F (8.7°C) to a cold 38.1°F (3.4°C). New Castle registers a consistent average low-temperature of 26.4°F (-3.1°C) during December.

Humidity

In December, the average relative humidity is 86%.

Rainfall

In New Castle, during December, the rain falls for 12 days and regularly aggregates up to 2.68" (68mm) of precipitation. Throughout the year, there are 177.6 rainfall days, and 34.92" (887mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In New Castle, in December, during 14.3 snowfall days, 4.69" (119mm) of snow is typically accumulated. In New Castle, during the entire year, snow falls for 68.2 days and aggregates up to 25.2" (640mm) 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 December, sunrise is at 7:27 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:03 pm EST.

Sunshine

In New Castle, the average sunshine in December is 3h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.
Note: In December, an average UV index of 1 transforms into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.

Frequently asked questions

How cold is December?

December temperatures vary between a high-temperature of 38.1°F (3.4°C) and a low-temperature of 26.4°F (-3.1°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, is calculated to be 86°F (30°C).

What is the average humidity in December?

In New Castle, the average relative humidity in December is 86%.

How much does it rain in December?

In December, the rain falls for 12 days. Throughout December, 2.68" (68mm) of precipitation is accumulated.

How much does it snow in December?

In New Castle, during December, snow falls for 14.3 days and regularly aggregates up to 4.69" (119mm) of snow.

What is the month with the shortest days in New Castle?

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 New Castle, Pennsylvania, the average day length in December is 9h and 17min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:27 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:03 pm EST.

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

In December, the average sunshine duration is 3h.

What is the month with the lowest UV index?

December is the month with the lowest UV index, with an average maximum UV index of 1.

How high is the UV index in December?

In New Castle, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to 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
New Castle, PA

Average temperature in December - New Castle, PA
  • Average high temperature in December: 38.1°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in December: 26.4°F

The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

Average pressure in December
New Castle, PA

Average pressure in December - New Castle, PA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
New Castle, PA

Average wind speed in December - New Castle, PA
  • Average wind speed in December: 7.6mph

The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest month (with the lowest average wind speed) is July (5.1mph).

Average humidity in December
New Castle, PA

Average humidity in December - New Castle, PA
  • 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, July and August (78%).

Average rainfall in December
New Castle, PA

Average rainfall in December - New Castle, PA
  • Average rainfall in December: 2.68"

The wettest month (with the highest rainfall) is June (3.66").
The driest month (with the least rainfall) is November (2.24").

Average rainfall days in December
New Castle, PA

Average rainfall days in December - New Castle, PA
  • Average rainfall days in December: 12 days

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (8.8 days).

Average snowfall in December
New Castle, PA

Average snowfall in December - New Castle, PA
  • Average snowfall in December: 4.69"

The month with the highest snowfall is January (6.93").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
New Castle, PA

Average snowfall days in December - New Castle, PA
  • Average snowfall days in December: 14.3 days

The month with the highest number of snowfall days is January (18.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
New Castle, PA

Average daylight in December / Average sunshine in December - New Castle, PA
  • 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: 3h and 0min

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

Average sunshine days in December
New Castle, PA

Average sunshine days in December - New Castle, PA
  • Average sunshine days in December: 9.4 days

The month with the most sunshine days is November (13.5 days).
The month with the least sunshine days is February (7 days).

Average UV index in December
New Castle, PA

Average UV index in December - New Castle, PA
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
New Castle, PA

Average cloud cover in December - New Castle, PA
  • Average cloud cover in December: 68

The month with the most cloud cover is January (Cloud cover 73).
The month with the least cloud cover is August (Cloud cover 36).

Average visibility in December
New Castle, PA

Average visibility in December - New Castle, PA
  • Average visibility in December: 4mi

The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February and December (4mi).

New Castle, Pennsylvania, USA

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