December weather forecast
Harrison, PA

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Weather in December

December, the first month of the winter in Harrison, is also a wintry month, with an average temperature varying between 24.1°F (-4.4°C) and 34.2°F (1.2°C).

Temperature

The beginning of December marks a decrease in the average high-temperature, transitioning from a chilly 43.7°F (6.5°C) in November to a cold 34.2°F (1.2°C). Harrison records a steady low-temperature average of 24.1°F (-4.4°C) during December.

Humidity

In Harrison, the average relative humidity in December is 86%.

Rainfall

In December, the rain falls for 11.8 days. Throughout December, 2.64" (67mm) of precipitation is accumulated. Throughout the year, there are 174 rainfall days, and 30.83" (783mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Harrison, in December, snow falls for 18 days, with typically accumulated 7.95" (202mm) of snow. In Harrison, during the entire year, snow falls for 86.8 days and aggregates up to 41.54" (1055mm) of snow.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year in Harrison.
On the first day of December, sunrise is at 7:19 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 4:49 pm EST.

Sunshine

The months with the least sunshine in Harrison, Pennsylvania, are January and December, with an average of 2.9h of sunshine.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 1 in December converts into the following recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Updated: Jun 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

Harrison in December has an average high-temperature of 34.2°F (1.2°C) and an average low-temperature of 24.1°F (-4.4°C).

What is the average humidity in December?

In December, the average relative humidity is 86%.

How much does it rain in December?

In Harrison, in December, it is raining for 11.8 days, with typically 2.64" (67mm) of accumulated precipitation.

How much does it snow in December?

In December, it is snowing for 18 days. Throughout December, 7.95" (202mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 12min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 11min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:19 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 4:49 pm EST.

What are the months with the least sunshine?

The months with the least sunshine are January and December, with an average of 2.9h of sunshine.

How many hours of sunshine does Harrison have in December?

The average sunshine duration in December in Harrison is 2.9h.

When is the lowest UV index?

The months with the lowest UV index are January and December, with an average maximum UV index of 1.

What is the UV index intensity in December?

In Harrison, the average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to Sun's UV rays.
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
Harrison, PA

Average temperature in December - Harrison, PA
  • Average high temperature in December: 34.2°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (28°F).

  • Average low temperature in December: 24.1°F

The month with the highest average low temperature is July (56.5°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).

Average pressure in December
Harrison, PA

Average pressure in December - Harrison, PA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Harrison, PA

Average wind speed in December - Harrison, PA
  • Average wind speed in December: 8.5mph

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

Average humidity in December
Harrison, PA

Average humidity in December - Harrison, PA
  • Average humidity in December: 86%

The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are June and July (78%).

Average rainfall in December
Harrison, PA

Average rainfall in December - Harrison, PA
  • Average rainfall in December: 2.64"

The wettest month (with the highest rainfall) is April (3.43").
The driest month (with the least rainfall) is September (2.17").

Average rainfall days in December
Harrison, PA

Average rainfall days in December - Harrison, PA
  • Average rainfall days in December: 11.8 days

The month with the highest number of rainy days is May (18.9 days).
The month with the least rainy days is February (8.9 days).

Average snowfall in December
Harrison, PA

Average snowfall in December - Harrison, PA
  • Average snowfall in December: 7.95"

The month with the highest snowfall is February (10.2").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Harrison, PA

Average snowfall days in December - Harrison, PA
  • Average snowfall days in December: 18 days

The month with the highest number of snowfall days is January (20.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Harrison, PA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 2h and 5min

The month with the most sunshine is July (Average sunshine: 9h and 48min).
The months with the least sunshine are January and December (Average sunshine: 2h and 54min).

Average sunshine days in December
Harrison, PA

Average sunshine days in December - Harrison, PA
  • Average sunshine days in December: 7 days

The month with the most sunshine days is September (13.5 days).
The month with the least sunshine days is February (5.9 days).

Average UV index in December
Harrison, PA

Average UV index in December - Harrison, PA
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in December
Harrison, PA

Average cloud cover in December - Harrison, PA
  • Average cloud cover in December: 71

The month with the most cloud cover is January (Cloud cover 72).
The months with the least cloud cover are July and August (Cloud cover 41).

Average visibility in December
Harrison, PA

Average visibility in December - Harrison, PA
  • Average visibility in December: 5mi

The months with the highest visibility are March, April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are January, February and September (4mi).

Harrison, Pennsylvania, USA

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