December weather forecast
Silkworth, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Silkworth, Pennsylvania, with an average temperature fluctuating between 36.9°F (2.7°C) and 25.9°F (-3.4°C).

Temperature

With the beginning of December, the average high-temperature shows a decrease, transitioning from a frosty 46.2°F (7.9°C) in November to an icy 36.9°F (2.7°C). Silkworth's nights in December cool down to an average low-temperature of 25.9°F (-3.4°C).

Humidity

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

Rainfall

In Silkworth, in December, during 10.3 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. In Silkworth, during the entire year, the rain falls for 162.5 days and collects up to 30.35" (771mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In December, it is snowing for 7.8 days. Throughout December, 3.5" (89mm) of snow is accumulated. Throughout the year, there are 41.1 snowfall days, and 21.38" (543mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:11 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:45 pm EST.

Sunshine

The average sunshine in December is 3.8h.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 1 in December transforms into the following instructions:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. To protect against the Sun's most potent rays, avoid direct exposure around midday. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Updated: Jul 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature, in December, in Silkworth, records 36.9°F (2.7°C), while the low-temperature is 25.9°F (-3.4°C). The average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in July is computed to be 86°F (30°C).

What is the average humidity in December?

In December, the average relative humidity is 83%.

How much does it rain in December?

In Silkworth, during December, the rain falls for 10.3 days and regularly aggregates up to 2.2" (56mm) of precipitation.

How many days does it snow in December?

In December, it is snowing for 7.8 days. Throughout December, 3.5" (89mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days in Silkworth is December, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

The average day length in December in Silkworth is 9h and 16min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:11 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:45 pm EST.

How long on average sun shines in December?

In Silkworth, the average sunshine duration in December is 3.8h.

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 reading in December?

The average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a low health risk from unsafe 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
Silkworth, PA

Average temperature in December - Silkworth, PA
  • Average high temperature in December: 36.9°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in December: 25.9°F

The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).

Average pressure in December
Silkworth, PA

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

Average wind speed in December
Silkworth, PA

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

The windiest months (with the highest average wind speed) are March and April (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in December
Silkworth, PA

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

The month with the highest relative humidity is February (84%).
The months with the lowest relative humidity are April and July (78%).

Average rainfall in December
Silkworth, PA

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

The wettest month (with the highest rainfall) is July (3.23").
The driest months (with the least rainfall) are January and September (2.09").

Average rainfall days in December
Silkworth, PA

Average rainfall days in December - Silkworth, PA
  • Average rainfall days in December: 10.3 days

The month with the highest number of rainy days is May (19.1 days).
The month with the least rainy days is February (8.2 days).

Average snowfall in December
Silkworth, PA

Average snowfall in December - Silkworth, PA
  • Average snowfall in December: 3.5"

The month with the highest snowfall is February (6.42").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Silkworth, PA

Average snowfall days in December - Silkworth, PA
  • Average snowfall days in December: 7.8 days

The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Silkworth, PA
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 3h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).

Average sunshine days in December
Silkworth, PA

Average sunshine days in December - Silkworth, PA
  • Average sunshine days in December: 15.4 days

The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is July (9.1 days).

Average UV index in December
Silkworth, PA

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

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

Average cloud cover in December
Silkworth, PA

Average cloud cover in December - Silkworth, PA
  • Average cloud cover in December: 60

The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 37).

Average visibility in December
Silkworth, PA

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

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

Silkworth, Pennsylvania, USA

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