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 ranging between min 29.7°F (-1.3°C) and max 41°F (5°C).

Temperature

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

Humidity

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

Rainfall

In Harrisburg, during 8.4 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. Throughout the year, there are 122.3 rainfall days, and 11.73" (298mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Harrisburg, during December, snow falls for 3.5 days and regularly aggregates up to 0.59" (15mm) of snow. In Harrisburg, 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 the month, sunrise is at 7:10 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:29 am and sunset at 4:51 pm EST.

Sunshine

The average sunshine in December in Harrisburg 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 reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
[Resources]

FAQ

What is the temperature in December in Harrisburg?

In December, the average high-temperature is 41°F (5°C), and the average low-temperature is 29.7°F (-1.3°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is evaluated at 87.8°F (31°C).

What is the average humidity in December in Harrisburg?

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

How much does it rain in Harrisburg in December?

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

How many days does it snow in December in Harrisburg?

In December, in Harrisburg, 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 in Harrisburg.

How many hours of daylight does Harrisburg have in December?

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

When is the sunrise / sunset in December in Harrisburg?

In December, on the first day of the month, sunrise is at 7:10 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?

The average sunshine duration in December in Harrisburg, Pennsylvania, is 4.7h.

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

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

What is the UV index reading in December in Harrisburg?

In December, the average daily maximum UV index is 2. A UV Index reading 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).

[Resources]

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).

[Resources]

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).

[Resources]

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%).

[Resources]

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").

[Resources]

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).

[Resources]

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").

[Resources]

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).

[Resources]

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).

[Resources]

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).

[Resources]

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).

[Resources]

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).

[Resources]

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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location