December weather forecast
Sylvester, PA

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Weather in December

December, the first month of the winter in Sylvester, is still a cold month, with an average temperature ranging between min 24.6°F (-4.1°C) and max 34.5°F (1.4°C).

Temperature

With the beginning of December, the average high-temperature shows a decrease, transitioning from a frosty 44.1°F (6.7°C) in November to an icy 34.5°F (1.4°C). Sylvester's nights in December cool down to an average low-temperature of 24.6°F (-4.1°C).

Humidity

The average relative humidity in December is 85%.

Rainfall

In Sylvester, in December, it is raining for 12.1 days, with typically 2.2" (56mm) of accumulated precipitation. Throughout the year, in Sylvester, there are 168.3 rainfall days, and 28.19" (716mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Sylvester, in December, during 16.2 snowfall days, 6.02" (153mm) of snow is typically accumulated. Throughout the year, there are 80.4 snowfall days, and 33.03" (839mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 12min of daylight.
On the first day of the month, sunrise is at 7:19 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:38 am and sunset at 4:49 pm EST.

Sunshine

January, February and December, with an average of 3.1h of sunshine, are months with the least sunshine in Sylvester.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Sylvester. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum daily UV index of 1 during December morphs into the following directions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in Sylvester in December?

The high-temperature in Sylvester, Pennsylvania, during December is 34.5°F (1.4°C) and the low-temperature is 24.6°F (-4.1°C).

What is the average humidity in December in Sylvester?

In Sylvester, the average relative humidity in December is 85%.

How much does it rain in Sylvester in December?

In December, the rain falls for 12.1 days. Throughout December, 2.2" (56mm) of precipitation is accumulated.

How much does it snow in Sylvester in December?

In Sylvester, during December, snow falls for 16.2 days and regularly aggregates up to 6.02" (153mm) of snow.

What is the month with the shortest days in Sylvester?

December has the shortest days of the year, with an average of 9h and 12min of daylight.

How many hours of daylight does Sylvester have in December?

In Sylvester, Pennsylvania, the average day length in December is 9h and 11min.

What time are sunrise and sunset in December in Sylvester?

In December, on the first day of the month, sunrise is at 7:19 am and sunset at 4:39 pm. On the last day of the month, in Sylvester, Pennsylvania, sunrise is at 7:38 am and sunset at 4:49 pm EST.

What is the month with the least sunshine in Sylvester?

January, February and December, with an average of 3.1h of sunshine, are months with the least sunshine.

How long on average sun shines in December in Sylvester?

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

What are the months with the lowest UV index in Sylvester?

The months with the lowest UV index are January and December, with an average maximum UV index of 1.

What is the UV index reading in December in Sylvester?

The average daily maximum UV index in December in Sylvester 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
Sylvester, PA

Average temperature in December - Sylvester, PA
  • Average high temperature in December: 34.5°F

The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (28.2°F).

  • Average low temperature in December: 24.6°F

The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).

Average pressure in December
Sylvester, PA

Average pressure in December - Sylvester, PA
  • Average pressure in December: 30.08"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Sylvester, PA

Average wind speed in December - Sylvester, PA
  • Average wind speed in December: 8.9mph

The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest month (with the lowest average wind speed) is August (6mph).

Average humidity in December
Sylvester, PA

Average humidity in December - Sylvester, PA
  • Average humidity in December: 85%

The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April, May and June (78%).

Average rainfall in December
Sylvester, PA

Average rainfall in December - Sylvester, PA
  • Average rainfall in December: 2.2"

The wettest month (with the highest rainfall) is April (2.95").
The driest month (with the least rainfall) is November (1.81").

Average rainfall days in December
Sylvester, PA

Average rainfall days in December - Sylvester, PA
  • Average rainfall days in December: 12.1 days

The month with the highest number of rainy days is July (18.9 days).
The month with the least rainy days is February (7.2 days).

Average snowfall in December
Sylvester, PA

Average snowfall in December - Sylvester, PA
  • Average snowfall in December: 6.02"

The month with the highest snowfall is February (7.76").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Sylvester, PA

Average snowfall days in December - Sylvester, PA
  • Average snowfall days in December: 16.2 days

The month with the highest number of snowfall days is January (18.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Sylvester, PA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 3h and 1min

The month with the most sunshine is July (Average sunshine: 9h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 6min).

Average sunshine days in December
Sylvester, PA

Average sunshine days in December - Sylvester, PA
  • Average sunshine days in December: 8 days

The month with the most sunshine days is September (14.9 days).
The month with the least sunshine days is February (7.1 days).

Average UV index in December
Sylvester, PA

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

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in December
Sylvester, PA

Average cloud cover in December - Sylvester, PA
  • Average cloud cover in December: 70

The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 39).

Average visibility in December
Sylvester, PA

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

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

Sylvester, Pennsylvania, USA

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