December weather forecast
Harrisburg, PA

A church, a mosque, and other buildings along State Street in Harrisburg, Pennsylvania
A church, a mosque, and other buildings along State Street in Harrisburg, Pennsylvania

Weather in December

December, the first month of the winter in Harrisburg, is still a cold month, with an average temperature varying between 41°F (5°C) and 29.7°F (-1.3°C).

Temperature

In December, the average high-temperature drops from a cool 50°F (10°C) in November to a cold 41°F (5°C). In Harrisburg, Pennsylvania, the average low-temperature is 29.7°F (-1.3°C).

Humidity

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

Rainfall

In December, in Harrisburg, the rain falls for 8.4 days. Throughout December, 0.87" (22mm) of precipitation is accumulated. In Harrisburg, during the entire year, the rain falls for 122.3 days and collects up to 11.73" (298mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Harrisburg, during December, snow falls for 3.5 days and regularly aggregates up to 0.59" (15mm) of snow. In Harrisburg, Pennsylvania, during the entire year, snow falls for 19.9 days and aggregates up to 4.29" (109mm) of snow.

Daylight

With an average of 9h and 22min of daylight, December has the shortest days of the year.
On the first day of December in Harrisburg, Pennsylvania, sunrise is at 7:11 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:51 pm EST.

Sunshine

The average sunshine in December is 4.7h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in December in Harrisburg?

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

How many days does it rain in December in Harrisburg?

In Harrisburg, in December, it is raining for 8.4 days, with typically 0.87" (22mm) of accumulated precipitation.

How much does it snow in Harrisburg in December?

In December, in Harrisburg, Pennsylvania, it is snowing for 3.5 days. Throughout December, 0.59" (15mm) of snow is accumulated.

What is the month with the shortest days in Harrisburg?

With an average of 9h and 22min of daylight, December has the shortest days of the year.

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

The average day length in December is 9h and 22min.

When are sunrise and sunset in December in Harrisburg?

On the first day of December in Harrisburg, sunrise is at 7:11 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:51 pm EST.

How many hours of sunshine does Harrisburg have in December?

In December, the average sunshine duration in Harrisburg is 4.7h.

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

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Harrisburg.

How high is the UV index in December in Harrisburg?

In December, the average daily maximum UV index in Harrisburg, Pennsylvania, is 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to 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
Harrisburg, PA

Average temperature in December - Harrisburg, 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: 29.7°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).

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Average pressure in December
Harrisburg, PA

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

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

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Average wind speed in December
Harrisburg, PA

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

The windiest month (with the highest average wind speed) is March (8.2mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

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Average humidity in December
Harrisburg, PA

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

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

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Average rainfall in December
Harrisburg, PA

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

The wettest month (with the highest rainfall) is August (1.3").
The driest months (with the least rainfall) are January and February (0.71").

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Average rainfall days in December
Harrisburg, PA

Average rainfall days in December - Harrisburg, PA
  • Average rainfall days in December: 8.4 days

The month with the highest number of rainy days is May (13.9 days).
The month with the least rainy days is January (5.7 days).

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Average snowfall in December
Harrisburg, PA

Average snowfall in December - Harrisburg, PA
  • Average snowfall in December: 0.59"

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

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Average snowfall days in December
Harrisburg, PA

Average snowfall days in December - Harrisburg, PA
  • Average snowfall days in December: 3.5 days

The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 0min).
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
Harrisburg, PA

Average sunshine days in December - Harrisburg, PA
  • Average sunshine days in December: 20.2 days

The month with the most sunshine days is November (21.8 days).
The month with the least sunshine days is July (14.1 days).

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Average UV index in December
Harrisburg, PA

Average UV index in December - Harrisburg, 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
Harrisburg, PA

Average cloud cover in December - Harrisburg, PA
  • Average cloud cover in December: 50

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

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Average visibility in December
Harrisburg, PA

Average visibility in December - Harrisburg, 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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