December weather forecast
Harrison Valley, PA

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Weather in December

The first month of the winter, December, is also an icy month in Harrison Valley, Pennsylvania, with an average temperature ranging between min 24.1°F (-4.4°C) and max 34.2°F (1.2°C).

Temperature

A shift in the average high-temperature occurs in December, reducing from a chilly 43.7°F (6.5°C) in November to a wintry 34.2°F (1.2°C). Harrison Valley records an average temperature drop to a subzero cold 24.1°F (-4.4°C) in December.

Humidity

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

Rainfall

In Harrison Valley, in December, it is raining for 11.8 days, with typically 2.64" (67mm) of accumulated precipitation. In Harrison Valley, during the entire year, the rain falls for 174 days and collects up to 30.83" (783mm) of precipitation.

Snowfall

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

Daylight

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

Sunshine

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

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, an average UV index of 1 transforms into the following instructions:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.

Frequently asked questions

How cold is December?

In December, the average high-temperature and low-temperature are 34.2°F (1.2°C) and 24.1°F (-4.4°C) respectively.

What is the average humidity in December?

The average relative humidity in December is 86%.

How many days does it rain in December?

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

How many days does it snow in December?

In Harrison Valley, in December, snow falls for 18 days, with typically accumulated 7.95" (202mm) of snow.

What is the month with the shortest days?

With an average of 9h and 12min of daylight, December has the shortest days of the year.

How many hours of daylight does Harrison Valley have in December?

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

When are sunrise and sunset in December?

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.

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 long on average sun shines in December in Harrison Valley?

The average sunshine duration in December is 2.9h.

What are the months with 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 December, the average daily maximum UV index is 1. A UV Index of 2, and less, symbolizes a minimal hazard to health 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 Valley, PA

Average temperature in December - Harrison Valley, 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 Valley, PA

Average pressure in December - Harrison Valley, 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 Valley, PA

Average wind speed in December - Harrison Valley, 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 Valley, PA

Average humidity in December - Harrison Valley, 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 Valley, PA

Average rainfall in December - Harrison Valley, 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 Valley, PA

Average rainfall days in December - Harrison Valley, 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 Valley, PA

Average snowfall in December - Harrison Valley, 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 Valley, PA

Average snowfall days in December - Harrison Valley, 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 Valley, PA

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

Average sunshine days in December - Harrison Valley, 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 Valley, PA

Average UV index in December - Harrison Valley, 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 Valley, PA

Average cloud cover in December - Harrison Valley, 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 Valley, PA

Average visibility in December - Harrison Valley, 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 Valley, Pennsylvania, USA

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