December weather forecast
Clairton, PA

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Weather in December

December, the first month of the winter in Clairton, is also an icy month, with temperature in the range of an average high of 39.6°F (4.2°C) and an average low of 28.6°F (-1.9°C).

Temperature

As December begins, there is a decrease in the average high-temperature, falling from a frosty 49.5°F (9.7°C) in November to an icy 39.6°F (4.2°C). In December, Clairton experiences an average nighttime temperature of 28.6°F (-1.9°C).

Humidity

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

Rainfall

In Clairton, in December, it is raining for 11.2 days, with typically 1.46" (37mm) of accumulated precipitation. In Clairton, during the entire year, the rain falls for 161.9 days and collects up to 19.29" (490mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. In Clairton, Pennsylvania, during December, snow falls for 10.1 days and regularly aggregates up to 1.69" (43mm) of snow. Throughout the year, there are 49.2 snowfall days, and 8.62" (219mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:23 am and sunset at 4:54 pm. On the last day of December, sunrise is at 7:42 am and sunset at 5:03 pm EST.

Sunshine

In Clairton, the average sunshine in December is 3.5h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the UV index of 1 transforms into the following advice:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days. 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 it in December?

In Clairton, in December, the average high-temperature is 39.6°F (4.2°C), and the average low-temperature is 28.6°F (-1.9°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is estimated at 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December is 84%.

How much does it rain in December?

In Clairton, during December, the rain falls for 11.2 days and regularly aggregates up to 1.46" (37mm) of precipitation.

How many days does it snow in December?

In December, it is snowing for 10.1 days. Throughout December, 1.69" (43mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year in Clairton, with an average of 9h and 24min of daylight.

How many hours of daylight does Clairton have in December?

In December, the average day length is 9h and 22min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:23 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 5:03 pm EST.

How many hours of sunshine does Clairton have in December?

In December, the average sunshine duration is 3.5h.

What is the month with the lowest UV index?

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

What is the UV index intensity in December?

The average daily maximum UV index in December 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
Clairton, PA

Average temperature in December - Clairton, PA
  • Average high temperature in December: 39.6°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 (33.6°F).

  • Average low temperature in December: 28.6°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

Average pressure in December
Clairton, PA

Average pressure in December - Clairton, 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
Clairton, PA

Average wind speed in December - Clairton, PA
  • Average wind speed in December: 7.4mph

The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

Average humidity in December
Clairton, PA

Average humidity in December - Clairton, 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
Clairton, PA

Average rainfall in December - Clairton, PA
  • Average rainfall in December: 1.46"

The wettest month (with the highest rainfall) is May (2.28").
The driest months (with the least rainfall) are January and November (1.14").

Average rainfall days in December
Clairton, PA

Average rainfall days in December - Clairton, PA
  • Average rainfall days in December: 11.2 days

The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (9.1 days).

Average snowfall in December
Clairton, PA

Average snowfall in December - Clairton, PA
  • Average snowfall in December: 1.69"

The month with the highest snowfall is January (2.13").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Clairton, PA

Average snowfall days in December - Clairton, PA
  • Average snowfall days in December: 10.1 days

The month with the highest number of snowfall days is January (14.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Clairton, 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 24min).

  • Average sunshine in December: 3h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in December
Clairton, PA

Average sunshine days in December - Clairton, PA
  • Average sunshine days in December: 12.1 days

The month with the most sunshine days is November (17 days).
The month with the least sunshine days is February (9 days).

Average UV index in December
Clairton, PA

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

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

Average cloud cover in December
Clairton, PA

Average cloud cover in December - Clairton, 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 32).

Average visibility in December
Clairton, PA

Average visibility in December - Clairton, 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).

Clairton, Pennsylvania, USA

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