December weather forecast
Leetsdale, PA

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Weather in December

December, the first month of the winter in Leetsdale, is also an icy month, with an average temperature ranging between min 27.7°F (-2.4°C) and max 38.5°F (3.6°C).

Temperature

In Leetsdale, entering December brings a temperature decrement, reducing from November's chilly 48.6°F (9.2°C) to an icy 38.5°F (3.6°C). In Leetsdale, an average temperature of 27.7°F (-2.4°C) is noted during December nights.

Humidity

In December, the average relative humidity is 84%.

Rainfall

In Leetsdale, during December, the rain falls for 12.5 days and regularly aggregates up to 1.93" (49mm) of precipitation. In Leetsdale, during the entire year, the rain falls for 171.3 days and collects up to 25.79" (655mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Leetsdale. In Leetsdale, in December, snow falls for 12 days, with typically accumulated 2.05" (52mm) of snow. In Leetsdale, Pennsylvania, during the entire year, snow falls for 56.4 days and aggregates up to 12.36" (314mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of December in Leetsdale, Pennsylvania, sunrise is at 7:25 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 5:04 pm EST.

Sunshine

In December, the average sunshine is 3.3h.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index in Leetsdale. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 1 in December translates into these instructions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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Frequently asked questions

How cold is December in Leetsdale?

In Leetsdale, 38.5°F (3.6°C) is the average high-temperature and 27.7°F (-2.4°C) is the average low-temperature during December. In August, the average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is computed to be 87.8°F (31°C).

What is the average humidity in December in Leetsdale?

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

How many days does it rain in December in Leetsdale?

In Leetsdale, Pennsylvania, during December, the rain falls for 12.5 days and regularly aggregates up to 1.93" (49mm) of precipitation.

How many days does it snow in December in Leetsdale?

In Leetsdale, in December, during 12 snowfall days, 2.05" (52mm) of snow is typically accumulated.

What is the month with the shortest days in Leetsdale?

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

How many hours of daylight does Leetsdale have in December?

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

What time are sunrise and sunset in December in Leetsdale?

On the first day of December in Leetsdale, Pennsylvania, sunrise is at 7:25 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 5:04 pm EST.

How many hours of sunshine does Leetsdale have in December?

The average sunshine duration in December in Leetsdale, Pennsylvania, is 3.3h.

When is the lowest UV index in Leetsdale?

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

What is the UV index intensity in December in Leetsdale?

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 the Sun's UV radiation.
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
Leetsdale, PA

Average temperature in December - Leetsdale, PA
  • Average high temperature in December: 38.5°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (32.7°F).

  • Average low temperature in December: 27.7°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 (20.1°F).

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Average pressure in December
Leetsdale, PA

Average pressure in December - Leetsdale, 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 (29.94"Hg).

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Average wind speed in December
Leetsdale, PA

Average wind speed in December - Leetsdale, 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).

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Average humidity in December
Leetsdale, PA

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

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

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Average rainfall in December
Leetsdale, PA

Average rainfall in December - Leetsdale, PA
  • Average rainfall in December: 1.93"

The wettest month (with the highest rainfall) is April (2.72").
The driest month (with the least rainfall) is January (1.61").

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Average rainfall days in December
Leetsdale, PA

Average rainfall days in December - Leetsdale, PA
  • Average rainfall days in December: 12.5 days

The month with the highest number of rainy days is May (18.9 days).
The month with the least rainy days is January (9.1 days).

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Average snowfall in December
Leetsdale, PA

Average snowfall in December - Leetsdale, PA
  • Average snowfall in December: 2.05"

The month with the highest snowfall is January (3.54").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Leetsdale, PA

Average snowfall days in December - Leetsdale, PA
  • Average snowfall days in December: 12 days

The month with the highest number of snowfall days is January (17 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Leetsdale, 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: 2h and 54min).

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Average sunshine days in December
Leetsdale, PA

Average sunshine days in December - Leetsdale, PA
  • Average sunshine days in December: 9.7 days

The month with the most sunshine days is November (15.3 days).
The month with the least sunshine days is February (8.2 days).

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Average UV index in December
Leetsdale, PA

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

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

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Average cloud cover in December
Leetsdale, PA

Average cloud cover in December - Leetsdale, PA
  • Average cloud cover in December: 66

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in December
Leetsdale, PA

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

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

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Leetsdale, Pennsylvania, USA

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