December weather forecast
Carlisle, PA

The scenic green city of Carlisle in Pennsylvania
The scenic green city of Carlisle in Pennsylvania

Weather in December

December, the first month of the winter in Carlisle, is still a cold month, with temperature in the range of an average low of 29.5°F (-1.4°C) and an average high of 41°F (5°C).

Temperature

In December, the average high-temperature decreases from a fresh 50°F (10°C) in November to a wintry 41°F (5°C). In December, the average low-temperature is 29.5°F (-1.4°C).

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Carlisle, during December, the rain falls for 8.1 days and regularly aggregates up to 0.87" (22mm) of precipitation. Throughout the year, there are 123.7 rainfall days, and 12.09" (307mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall in Carlisle, Pennsylvania. In Carlisle, snow falls for 3.3 days, with typically accumulated 0.51" (13mm) of snow. In Carlisle, during the entire year, snow falls for 22.3 days and aggregates up to 4.72" (120mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 22min of daylight.
On the first day of the month, sunrise is at 7:12 am and sunset at 4:43 pm. On the last day of December, sunrise is at 7:31 am and sunset at 4:52 pm EST.

Sunshine

The average sunshine in December in Carlisle is 4.7h.

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 value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Carlisle?

In Carlisle, the average relative humidity in December is 79%.

How many days does it rain in December in Carlisle?

In Carlisle, Pennsylvania, during December, the rain falls for 8.1 days and regularly aggregates up to 0.87" (22mm) of precipitation.

How many days does it snow in December in Carlisle?

In December, in Carlisle, it is snowing for 3.3 days. Throughout December, 0.51" (13mm) of snow is accumulated.

What is the month with the shortest days in Carlisle?

The month with the shortest days in Carlisle, Pennsylvania, is December, with an average of 9h and 22min of daylight.

How many hours of daylight does Carlisle have in December?

In December, the average day length is 9h and 22min.

When is the sunrise / sunset in December in Carlisle?

In December, on the first day of the month, sunrise is at 7:12 am and sunset at 4:43 pm. On the last day of the month, in Carlisle, Pennsylvania, sunrise is at 7:31 am and sunset at 4:52 pm EST.

How many hours of sunshine does Carlisle have in December?

The average sunshine duration in December in Carlisle is 4.7h.

What are the months with the lowest UV index in Carlisle?

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 Carlisle?

In December, the average daily maximum UV index in Carlisle is 2. A UV Index value of 2, and less, symbolizes a low health threat from exposure to the Sun's UV radiation.
Average high temperature
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
Carlisle, PA

Average temperature in December - Carlisle, PA
  • Average high temperature in December: 41°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in December: 29.5°F

The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).

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Average pressure in December
Carlisle, PA

Average pressure in December - Carlisle, PA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

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Average wind speed in December
Carlisle, PA

Average wind speed in December - Carlisle, PA
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

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Average humidity in December
Carlisle, PA

Average humidity in December - Carlisle, PA
  • Average humidity in December: 79%

The month with the highest relative humidity is February (80%).
The months with the lowest relative humidity are April and July (75%).

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Average rainfall in December
Carlisle, PA

Average rainfall in December - Carlisle, PA
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is May (1.34").
The driest months (with the least rainfall) are January and February (0.75").

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Average rainfall days in December
Carlisle, PA

Average rainfall days in December - Carlisle, PA
  • Average rainfall days in December: 8.1 days

The month with the highest number of rainy days is May (14.7 days).
The month with the least rainy days is January (5.3 days).

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Average snowfall in December
Carlisle, PA

Average snowfall in December - Carlisle, PA
  • Average snowfall in December: 0.51"

The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Carlisle, PA

Average snowfall days in December - Carlisle, PA
  • Average snowfall days in December: 3.3 days

The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Carlisle, PA
  • Average daylight in December: 9h and 22min

The month with the longest days is June (Average daylight: 14h and 59min).
The month with the shortest days is December (Average daylight: 9h and 22min).

  • Average sunshine in December: 4h and 42min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

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Average sunshine days in December
Carlisle, PA

Average sunshine days in December - Carlisle, PA
  • Average sunshine days in December: 20.5 days

The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is May (13.8 days).

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Average UV index in December
Carlisle, PA

Average UV index in December - Carlisle, PA
  • Average UV index in December: 2

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

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Average cloud cover in December
Carlisle, PA

Average cloud cover in December - Carlisle, PA
  • Average cloud cover in December: 49

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in December
Carlisle, PA

Average visibility in December - Carlisle, PA
  • Average visibility in December: 6mi

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

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