December weather forecast
Carnegie, PA

Share

Weather in December

The first month of the winter, December, is also a wintry month in Carnegie, Pennsylvania, with temperature in the range of an average low of 28.4°F (-2°C) and an average high of 39.7°F (4.3°C).

Temperature

The onset of December introduces a moderate change in Carnegie's weather, with average high-temperatures falling from November's chilly 49.3°F (9.6°C) to a wintry 39.7°F (4.3°C). Carnegie's nights in December experience an average temperature drop to a freezing cold 28.4°F (-2°C).

Humidity

In Carnegie, Pennsylvania, the average relative humidity in December is 83%.

Rainfall

In December, in Carnegie, the rain falls for 8.2 days. Throughout December, 0.87" (22mm) of precipitation is accumulated. In Carnegie, during the entire year, the rain falls for 132.6 days and collects up to 11.5" (292mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Carnegie. In Carnegie, Pennsylvania, in December, snow falls for 6.4 days, with typically accumulated 0.59" (15mm) of snow. In Carnegie, during the entire year, snow falls for 32.5 days and aggregates up to 3.66" (93mm) of snow.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:24 am and sunset at 4:54 pm. On the last day of December, sunrise is at 7:43 am and sunset at 5:04 pm EST.

Sunshine

The average sunshine in December is 3.4h.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 1 in December interprets into the following recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The Sun's radiation is especially intense around midday; try to stay in shade during this period. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
[Resources]

Frequently asked questions

How cold is it in Carnegie in December?

Carnegie in December has an average high-temperature of 39.7°F (4.3°C) and an average low-temperature of 28.4°F (-2°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is evaluated at 87.8°F (31°C).

What is the average humidity in December in Carnegie?

In Carnegie, Pennsylvania, the average relative humidity in December is 83%.

How many days does it rain in December in Carnegie?

In Carnegie, in December, during 8.2 rainfall days, 0.87" (22mm) of precipitation is typically accumulated.

How much does it snow in Carnegie in December?

In Carnegie, in December, during 6.4 snowfall days, 0.59" (15mm) of snow is typically accumulated.

What is the month with the shortest days in Carnegie?

With an average of 9h and 18min of daylight, December has the shortest days of the year in Carnegie, Pennsylvania.

How many hours of daylight does Carnegie have in December?

In Carnegie, Pennsylvania, the average day length in December is 9h and 21min.

What time are sunrise and sunset in December in Carnegie?

In December, on the first day of the month, sunrise is at 7:24 am and sunset at 4:54 pm. On the last day of the month, in Carnegie, Pennsylvania, sunrise is at 7:43 am and sunset at 5:04 pm EST.

How long on average sun shines in December in Carnegie?

In Carnegie, the average sunshine duration in December is 3.4h.

When is the lowest UV index in Carnegie?

December is the month with the lowest UV index in Carnegie, Pennsylvania, with an average maximum UV index of 1.

What is the UV index intensity in December in Carnegie?

In December, the average daily maximum UV index in Carnegie, Pennsylvania, is 1. A UV Index estimate of 2, and below, represents a low health threat 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
Carnegie, PA

Average temperature in December - Carnegie, PA
  • Average high temperature in December: 39.7°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in December: 28.4°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (21°F).

[Resources]

Average pressure in December
Carnegie, PA

Average pressure in December - Carnegie, 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).

[Resources]

Average wind speed in December
Carnegie, PA

Average wind speed in December - Carnegie, PA
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

[Resources]

Average humidity in December
Carnegie, PA

Average humidity in December - Carnegie, PA
  • Average humidity in December: 83%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (75%).

[Resources]

Average rainfall in December
Carnegie, PA

Average rainfall in December - Carnegie, PA
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is July (1.34").
The driest month (with the least rainfall) is November (0.67").

[Resources]

Average rainfall days in December
Carnegie, PA

Average rainfall days in December - Carnegie, PA
  • Average rainfall days in December: 8.2 days

The month with the highest number of rainy days is July (15.6 days).
The month with the least rainy days is February (6.4 days).

[Resources]

Average snowfall in December
Carnegie, PA

Average snowfall in December - Carnegie, PA
  • Average snowfall in December: 0.59"

The month with the highest snowfall is February (0.98").
The months with the least snowfall are May, June, July, August, September and October (0").

[Resources]

Average snowfall days in December
Carnegie, PA

Average snowfall days in December - Carnegie, PA
  • Average snowfall days in December: 6.4 days

The month with the highest number of snowfall days is January (9.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

[Resources]

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

Average daylight in December / Average sunshine in December - Carnegie, 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 2min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

[Resources]

Average sunshine days in December
Carnegie, PA

Average sunshine days in December - Carnegie, PA
  • Average sunshine days in December: 18.5 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (12.2 days).

[Resources]

Average UV index in December
Carnegie, PA

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

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

[Resources]

Average cloud cover in December
Carnegie, PA

Average cloud cover in December - Carnegie, PA
  • Average cloud cover in December: 64

The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).

[Resources]

Average visibility in December
Carnegie, PA

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

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

[Resources]

Carnegie, Pennsylvania, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location