December weather forecast
Saint Leonard, PA

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Weather in December

December, the first month of the winter in Saint Leonard, is still a chilly month, with an average temperature fluctuating between 31.1°F (-0.5°C) and 42.8°F (6°C).

Temperature

The shift to December brings a decrease in the average high-temperature, falling from a fresh 52°F (11.1°C) in November to a chilly 42.8°F (6°C). In the month of December, the average low-temperature usually rests at a subzero cold 31.1°F (-0.5°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

December is the month with the most rainfall. Rain falls for 10.7 days and accumulates 3.31" (84mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Saint Leonard, in December, snow falls for 3.6 days, with typically accumulated 1.61" (41mm) of snow. In Saint Leonard, during the entire year, snow falls for 24 days and aggregates up to 12.13" (308mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:03 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:44 pm EST.

Sunshine

In December, the average sunshine is 5h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum UV index of 2 during December leads to these instructions:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Updated: Jun 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

The average high-temperature, in December, in Saint Leonard, is 42.8°F (6°C), while the average low-temperature is 31.1°F (-0.5°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in August is evaluated at 89.6°F (32°C).

What is the average humidity in December?

The average relative humidity in December is 77%.

What is the rainiest month?

The month with the most rainfall is December, when the rain falls for 10.7 days and typically aggregates up to 3.31" (84mm) of precipitation.

How much does it rain in December?

In Saint Leonard, during December, the rain falls for 10.7 days and regularly aggregates up to 3.31" (84mm) of precipitation.

How many days does it snow in December in Saint Leonard?

In Saint Leonard, in December, snow falls for 3.6 days, with typically accumulated 1.61" (41mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

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

When is the sunrise / sunset in December in Saint Leonard?

In December, on the first day of the month, sunrise is at 7:03 am and sunset at 4:34 pm. On the last day of the month, in Saint Leonard, sunrise is at 7:22 am and sunset at 4:44 pm EST.

How many hours of sunshine does Saint Leonard have in December?

In December, the average sunshine duration is 5h.

When is the lowest UV index?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index intensity in December?

In Saint Leonard, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Saint Leonard, PA

Average temperature in December - Saint Leonard, PA
  • Average high temperature in December: 42.8°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (36.9°F).

  • Average low temperature in December: 31.1°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in December
Saint Leonard, PA

Average pressure in December - Saint Leonard, 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 (29.93"Hg).

Average wind speed in December
Saint Leonard, PA

Average wind speed in December - Saint Leonard, PA
  • Average wind speed in December: 7.6mph

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Saint Leonard, PA

Average humidity in December - Saint Leonard, PA
  • Average humidity in December: 77%

The months with the highest relative humidity are February and October (78%).
The months with the lowest relative humidity are April, July and August (72%).

Average rainfall in December
Saint Leonard, PA

Average rainfall in December - Saint Leonard, PA
  • Average rainfall in December: 3.31"

The wettest month (with the highest rainfall) is December (3.31").
The driest month (with the least rainfall) is September (1.89").

Average rainfall days in December
Saint Leonard, PA

Average rainfall days in December - Saint Leonard, PA
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is November (8.5 days).

Average snowfall in December
Saint Leonard, PA

Average snowfall in December - Saint Leonard, PA
  • Average snowfall in December: 1.61"

The month with the highest snowfall is March (3.78").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Saint Leonard, PA

Average snowfall days in December - Saint Leonard, PA
  • Average snowfall days in December: 3.6 days

The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Saint Leonard, PA

Average daylight in December / Average sunshine in December - Saint Leonard, 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: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in December
Saint Leonard, PA

Average sunshine days in December - Saint Leonard, PA
  • Average sunshine days in December: 16.7 days

The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is June (11.4 days).

Average UV index in December
Saint Leonard, PA

Average UV index in December - Saint Leonard, PA
  • Average UV index in December: 2

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in December
Saint Leonard, PA

Average cloud cover in December - Saint Leonard, PA
  • Average cloud cover in December: 48

The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Saint Leonard, PA

Average visibility in December - Saint Leonard, PA
  • Average visibility in December: 6mi

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

Saint Leonard, Pennsylvania, USA

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