Harrisburg
Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast

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
December, the first month of the winter, in Harrisburg, is also a wintry month, with average temperature ranging between min 26.6°F (-3°C) and max 41.4°F (5.2°C).

Temperature

In Harrisburg, the average high-temperature in December decreases, from a fresh 53.1°F (11.7°C) in November, to a cold 41.4°F (5.2°C). In Harrisburg, the average low-temperature is 26.6°F (-3°C).

Humidity

In Harrisburg, the average relative humidity is 66.4%.

Rainfall

In Harrisburg, Pennsylvania, it is raining for 9.7 days, with typically 3.2" (82mm) of accumulated precipitation. In Harrisburg, during the entire year, the rain falls for 122 days and collects up to 40.7" (1034.8mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December.

Daylight

December has the shortest days of the year, with an average of 9.4h of daylight.

Sunshine

The month with the least sunshine is December, with an average of 4.1h of sunshine.

UV index

Months with the lowest UV index in Harrisburg are January, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV radiation for the ordinary person.
The average daily UV index of 2 transform into the following instructions:
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. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Harrisburg?

In Harrisburg, Pennsylvania, in December, the average high-temperature is 41.4°F (5.2°C), and the average low-temperature is 26.6°F (-3°C).

What is the average humidity in December in Harrisburg?

In December, the average relative humidity is 66.4%.

How many days does it rain in December in Harrisburg?

In Harrisburg, Pennsylvania, in December, it is raining for 9.7 days, with typically 3.2" (82mm) of accumulated precipitation.

How many days does it snow in December in Harrisburg?

In Harrisburg, Pennsylvania, during December, snow falls for 2.8 days and regularly aggregates up to 5.1" (129.5mm) of snow.

What is the month with the shortest days in Harrisburg?

December has the shortest days of the year in Harrisburg, with an average of 9.4h of daylight.

How many hours of daylight does Harrisburg have in December?

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

What is the month with the least sunshine in Harrisburg?

With an average of 4.1h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December in Harrisburg?

The average sunshine in December in Harrisburg is 4.1h.

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

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

What is the UV index reading in December in Harrisburg?

In December, the average daily maximum UV index in Harrisburg is 2. A UV Index reading of 2, and below, represents a low health threat from the exposure to the Sun's UV radiation.
Average temperature in December - Harrisburg, PA
  • Average high temperature in December: 5.2°C

The warmest month (with the highest average high temperature) is July (29.7°C).
The month with the lowest average high temperature is January (2.8°C).

  • Average low temperature in December: -3°C

The month with the highest average low temperature is July (19.1°C).
The coldest month (with the lowest average low temperature) is January (-5.1°C).

Average humidity in December - Harrisburg, PA
  • Average humidity in December: 66.4%

The month with the highest relative humidity is September (73.8%).
The month with the lowest relative humidity is April (59.2%).

Average rainfall in December - Harrisburg, PA
  • Average rainfall in December: 82mm

The wettest month (with the highest rainfall) is July (117.1mm).
The driest month (with the lowest rainfall) is February (60.7mm).

Average rainfall days in December - Harrisburg, PA
  • Average rainfall days in December: 9.7 days

The month with the highest number of rainy days is May (12.2 days).
The month with the lowest number of rainy days is October (8.8 days).

Average snowfall in December - Harrisburg, PA
  • Average snowfall in December: 129.5mm

The month with the highest snowfall is February (266.7mm).
Months with the lowest snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in December - Harrisburg, PA
  • Average snowfall days in December: 2.8 days

The month with the highest number of snowfall days is January (5.2 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

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 shortest days is December (Average daylight: 9.4h).

  • Average sunshine in December: 4.1h

The month with most sunshine is July (Average sunshine: 10h).
The month with least sunshine is December (Average sunshine: 4.1h).

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

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).