December weather - Winter 2024

Weather in December
Frequently asked questions
Average temperature in December
Average pressure in December
Average wind speed in December
Average humidity in December
Average rainfall in December
Average rainfall days in December
Average snowfall in December
Average snowfall days in December
Average daylight in December
Average sunshine in December
Average sunshine days in December
Average UV index in December
Average cloud cover in December
Average visibility in December

The iconic and unifying Pennsylvania monument in a vast green field with neat grounds and green trees in the city of Gettysburg, Pennsylvania

Weather in December

December in Gettysburg brings the full onset of winter, with temperatures falling from 29.8°F (-1.2°C) to 41.5°F (5.3°C). Good amounts of snowfall are expected with an accumulation of approximately 0.83" (21mm) of snow over the month. Daylight hours are fewest in December, a typical characteristic of winter, making for short days and longer nights. A significant reduction in sunshine hours and UV index marks this month as the year's darkest period. Despite the chill, December’s winter charm is enjoyed by many.

Temperature

Gettysburg, Pennsylvania, in December demonstrates a small temperature transition, adjusting from an average high of a fresh 50.7°F (10.4°C) in November to an icy 41.5°F (5.3°C). Gettysburg's nights in December cool down to an average low-temperature of 29.8°F (-1.2°C).

Humidity

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

Rainfall

In Gettysburg, Pennsylvania, in December, during 7.5 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. In Gettysburg, Pennsylvania, during the entire year, the rain falls for 125 days and collects up to 12.13" (308mm) of precipitation.

Snowfall

Months with snowfall in Gettysburg are January through April, October through December. In Gettysburg, in December, during 3.4 snowfall days, 0.83" (21mm) of snow is typically accumulated. In Gettysburg, Pennsylvania, during the entire year, snow falls for 20.9 days and aggregates up to 4.8" (122mm) of snow.

Daylight

December has the shortest days of the year in Gettysburg, Pennsylvania, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:11 am and sunset at 4:44 pm. On the last day of December, sunrise is at 7:30 am and sunset at 4:54 pm EST.

Sunshine

In December, the average sunshine is 4.9h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the UV index of 2 transforms into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.

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Frequently asked questions

How cold does it get in Gettysburg in December?

Gettysburg in December has an average high-temperature of 41.5°F (5.3°C) and an average low-temperature of 29.8°F (-1.2°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, in August is evaluated at 86°F (30°C).

What is the average humidity in December in Gettysburg?

The average relative humidity in December in Gettysburg, Pennsylvania, is 79%.

How many days does it rain in December in Gettysburg?

In Gettysburg, in December, it is raining for 7.5 days, with typically 0.87" (22mm) of accumulated precipitation.

How much does it snow in Gettysburg in December?

In Gettysburg, Pennsylvania, during December, snow falls for 3.4 days and regularly aggregates up to 0.83" (21mm) of snow.

What is the month with the shortest days in Gettysburg?

The month with the shortest days in Gettysburg, Pennsylvania, is December, with an average of 9h and 24min of daylight.

What is the average length of the day in December in Gettysburg?

In December, the average day length is 9h and 24min.

What time are sunrise and sunset in December in Gettysburg?

In December, on the first day of the month, sunrise is at 7:11 am and sunset at 4:44 pm. On the last day of the month, in Gettysburg, Pennsylvania, sunrise is at 7:30 am and sunset at 4:54 pm EST.

How many hours of sunshine does Gettysburg have in December?

The average sunshine duration in December in Gettysburg is 4.9h.

What is the month with the lowest UV index in Gettysburg?

The months with the lowest UV index in Gettysburg, Pennsylvania, are January, February, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Gettysburg?

In Gettysburg, Pennsylvania, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

50.7°F 10.4°C

41.5°F 5.3°C

35.6°F 2°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.8mph 12.6km/h

8.2mph 13.2km/h

8.8mph 14.2km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

21.6

20.6

20.8

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Gettysburg, PA

Average high temperature in December: 41.5°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (35.6°F).

Average low temperature in December: 29.8°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

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Average pressure in December
Gettysburg, 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
Gettysburg, PA

Average wind speed in December: 7.6mph

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

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Average humidity in December
Gettysburg, PA

Average humidity in December: 79%

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

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Average rainfall in December
Gettysburg, PA

Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is July (1.46").
The driest months (with the least rainfall) are January and February (0.71").

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Average rainfall days in December
Gettysburg, PA

Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (5 days).

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Average snowfall in December
Gettysburg, PA

Average snowfall in December: 0.83"

The month with the highest snowfall is March (1.3").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Gettysburg, PA

Average snowfall days in December: 3.4 days

The month with the highest number of snowfall days is February (6.4 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
Gettysburg, PA

Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

Average sunshine in December: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in December
Gettysburg, PA

Average sunshine days in December: 20.6 days

The month with the most sunshine days is November (21.6 days).
The month with the least sunshine days is August (13.6 days).

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Average UV index in December
Gettysburg, 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, November and December (UV index 2).

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Average cloud cover in December
Gettysburg, PA

Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in December
Gettysburg, 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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December weather forecast
Gettysburg, PA

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