December weather forecast
Tarentum, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Tarentum, Pennsylvania, with an average temperature fluctuating between 38.7°F (3.7°C) and 27.5°F (-2.5°C).

Temperature

With the onset of December, Tarentum experiences a modest temperature adjustment, with the average high-temperature receding from a frosty 48.4°F (9.1°C) in November to a cold 38.7°F (3.7°C). An average temperature of 27.5°F (-2.5°C) marks the nights in December.

Humidity

In December, the average relative humidity is 84%.

Rainfall

In Tarentum, during December, the rain falls for 13.7 days and regularly aggregates up to 2.99" (76mm) of precipitation. In Tarentum, during the entire year, the rain falls for 185.5 days and collects up to 35.59" (904mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In December, it is snowing for 13.5 days. Throughout December, 4.72" (120mm) of snow is accumulated. Throughout the year, there are 63.1 snowfall days, and 25.12" (638mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:24 am and sunset at 4:52 pm. On the last day of December, sunrise is at 7:42 am and sunset at 5:02 pm EST.

Sunshine

In December, the average sunshine is 3.1h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 1 during December leads to these advisories:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Updated: Jun 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

In Tarentum, 38.7°F (3.7°C) is the average high-temperature and 27.5°F (-2.5°C) is the average low-temperature during December. The average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, in August is appraised at 86°F (30°C).

What is the average humidity in December?

In Tarentum, the average relative humidity in December is 84%.

How much does it rain in December?

In Tarentum, during December, the rain falls for 13.7 days and regularly aggregates up to 2.99" (76mm) of precipitation.

How many days does it snow in December?

In Tarentum, Pennsylvania, in December, during 13.5 snowfall days, 4.72" (120mm) of snow is typically accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

In December, the average day length is 9h and 20min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:24 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 5:02 pm EST.

How many hours of sunshine does Tarentum have in December?

In December, the average sunshine duration in Tarentum is 3.1h.

What is the month with the lowest UV index?

The month with the lowest UV index is December, with an average maximum UV index of 1.

What is the UV index reading in December?

In Tarentum, the average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a low health risk from 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
Tarentum, PA

Average temperature in December - Tarentum, PA
  • Average high temperature in December: 38.7°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (32.7°F).

  • Average low temperature in December: 27.5°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).

Average pressure in December
Tarentum, PA

Average pressure in December - Tarentum, PA
  • Average pressure in December: 30.11"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).

Average wind speed in December
Tarentum, PA

Average wind speed in December - Tarentum, PA
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

Average humidity in December
Tarentum, PA

Average humidity in December - Tarentum, PA
  • Average humidity in December: 84%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April, July and August (76%).

Average rainfall in December
Tarentum, PA

Average rainfall in December - Tarentum, PA
  • Average rainfall in December: 2.99"

The wettest months (with the highest rainfall) are April and May (3.66").
The driest month (with the least rainfall) is November (2.2").

Average rainfall days in December
Tarentum, PA

Average rainfall days in December - Tarentum, PA
  • Average rainfall days in December: 13.7 days

The month with the highest number of rainy days is May (20.2 days).
The month with the least rainy days is January (11.1 days).

Average snowfall in December
Tarentum, PA

Average snowfall in December - Tarentum, PA
  • Average snowfall in December: 4.72"

The month with the highest snowfall is January (6.73").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Tarentum, PA

Average snowfall days in December - Tarentum, PA
  • Average snowfall days in December: 13.5 days

The month with the highest number of snowfall days is January (18 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Tarentum, PA
  • Average daylight in December: 9h and 2min

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 18min).

  • Average sunshine in December: 3h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).

Average sunshine days in December
Tarentum, PA

Average sunshine days in December - Tarentum, PA
  • Average sunshine days in December: 9 days

The month with the most sunshine days is November (14.8 days).
The month with the least sunshine days is January (7.3 days).

Average UV index in December
Tarentum, PA

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

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Tarentum, PA

Average cloud cover in December - Tarentum, PA
  • Average cloud cover in December: 67

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 34).

Average visibility in December
Tarentum, PA

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

The months with the highest visibility are April and August (6mi).
The months with the lowest visibility are January and February (4mi).

Tarentum, Pennsylvania, USA

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