December weather forecast and climate
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

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

Temperature

In December, the average high-temperature drops, 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, in Harrisburg, 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 December, it is snowing for 3.5 days. Throughout December, 0.59" (15mm) of snow is accumulated. In Harrisburg, during the entire year, snow falls for 19.9 days, and aggregates up to 4.29" (109mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9.4h of daylight.

Sunshine

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

UV index

Months with the lowest UV index in Harrisburg 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 threat to health from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Harrisburg?

The average high-temperature, in December, in Harrisburg, Pennsylvania, is 41°F (5°C), while the average low-temperature is 29.7°F (-1.3°C).

What is the average humidity in December in Harrisburg?

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

How much does it rain in Harrisburg in December?

In December, in Harrisburg, the rain falls for 8.4 days. Throughout December, 0.87" (22mm) of precipitation is accumulated.

How much does it snow in Harrisburg in December?

In Harrisburg, Pennsylvania, in December, snow falls for 3.5 days, with typically accumulated 0.59" (15mm) of snow.

What is the month with the shortest days in Harrisburg?

The month with the shortest days is December, with an average of 9.4h of daylight.

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

In December, the average length of the day is 9.4h.

How long on average sun shines in December in Harrisburg?

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

What is the month 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, Pennsylvania.

How high is the UV index in December in Harrisburg?

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

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"

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

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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%).
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").
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).
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: 9.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in December: 4.7h

The month with the most sunshine is July (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.5h).

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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

Months with the highest UV index are May, June and July (UV index 6).
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

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

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

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