December weather forecast
Duncan, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Duncan, Pennsylvania, with an average temperature ranging between max 34.7°F (1.5°C) and min 25.2°F (-3.8°C).

Temperature

Duncan's progression into December includes a drop in the average high-temperature, from a chilly 44.1°F (6.7°C) in November to a cold 34.7°F (1.5°C). Throughout December nights, Duncan experiences a consistent temperature average of 25.2°F (-3.8°C).

Humidity

The average relative humidity in December is 85%.

Rainfall

In December, the rain falls for 11.9 days. Throughout December, 1.5" (38mm) of precipitation is accumulated. Throughout the year, in Duncan, there are 161.9 rainfall days, and 20.04" (509mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Duncan, in December, during 14.3 snowfall days, 3.5" (89mm) of snow is typically accumulated. In Duncan, during the entire year, snow falls for 71.4 days and aggregates up to 16.54" (420mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 12min of daylight.
On the first day of December, sunrise is at 7:17 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:48 pm EST.

Sunshine

With an average of 3.1h of sunshine, December has the least sunshine of the year in Duncan.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 1 during December translates into the following directions:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. To protect against the Sun's most potent rays, avoid direct exposure around midday. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Updated: Aug 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

The high-temperature, in December, in Duncan, records 34.7°F (1.5°C), while the low-temperature is 25.2°F (-3.8°C).

What is the average humidity in December?

The average relative humidity in December is 85%.

How many days does it rain in December in Duncan?

In Duncan, during December, the rain falls for 11.9 days and regularly aggregates up to 1.5" (38mm) of precipitation.

How much does it snow in December?

In December, it is snowing for 14.3 days. Throughout December, 3.5" (89mm) of snow is accumulated.

What is the month with the shortest days?

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

How many hours of daylight does Duncan have in December?

The average day length in December is 9h and 13min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:17 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:48 pm EST.

What is the month with the least sunshine?

With an average of 3.1h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December?

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

What are the months with the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 1. A UV Index of 2, and less, symbolizes a minimal hazard to health 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
Duncan, PA

Average temperature in December - Duncan, PA
  • Average high temperature in December: 34.7°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in December: 25.2°F

The month with the highest average low temperature is July (57.4°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

Average pressure in December
Duncan, PA

Average pressure in December - Duncan, 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
Duncan, PA

Average wind speed in December - Duncan, PA
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in December
Duncan, PA

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

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

Average rainfall in December
Duncan, PA

Average rainfall in December - Duncan, PA
  • Average rainfall in December: 1.5"

The wettest month (with the highest rainfall) is April (2.24").
The driest month (with the least rainfall) is January (1.22").

Average rainfall days in December
Duncan, PA

Average rainfall days in December - Duncan, PA
  • Average rainfall days in December: 11.9 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.6 days).

Average snowfall in December
Duncan, PA

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

The month with the highest snowfall is February (4.57").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Duncan, PA

Average snowfall days in December - Duncan, PA
  • Average snowfall days in December: 14.3 days

The month with the highest number of snowfall days is January (17.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

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 12min).

  • Average sunshine in December: 3h and 1min

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

Average sunshine days in December
Duncan, PA

Average sunshine days in December - Duncan, PA
  • Average sunshine days in December: 9.2 days

The month with the most sunshine days is September (14.9 days).
The month with the least sunshine days is February (8.4 days).

Average UV index in December
Duncan, PA

Average UV index in December - Duncan, 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
Duncan, PA

Average cloud cover in December - Duncan, PA
  • Average cloud cover in December: 68

The months with the most cloud cover are January and December (Cloud cover 68).
The months with the least cloud cover are July and August (Cloud cover 40).

Average visibility in December
Duncan, PA

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

The months with the highest visibility are January, March, April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are February and September (4mi).

Duncan, Pennsylvania, USA

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