December weather forecast
Sweden Valley, PA

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Weather in December

December, the first month of the winter in Sweden Valley, is also a wintry month, with an average temperature fluctuating between 33.4°F (0.8°C) and 23.7°F (-4.6°C).

Temperature

Sweden Valley's average high-temperature decreases in December, falling from a chilly 43.3°F (6.3°C) in November to an icy 33.4°F (0.8°C). Sweden Valley anticipates an average minimum temperature of 23.7°F (-4.6°C) in the month of December.

Humidity

The average relative humidity in December is 87%.

Rainfall

In Sweden Valley, Pennsylvania, in December, during 10.4 rainfall days, 2.8" (71mm) of precipitation is typically accumulated. Throughout the year, there are 168.4 rainfall days, and 31.57" (802mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 19.6 days. Throughout December, 9.96" (253mm) of snow is accumulated. In Sweden Valley, during the entire year, snow falls for 98.2 days and aggregates up to 52.05" (1322mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 12min of daylight.
On the first day of the month, sunrise is at 7:20 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:38 am and sunset at 4:51 pm EST.

Sunshine

The average sunshine in December is 2.7h.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.
Note: A maximum UV index of 1 in December translates into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Updated: Aug 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

During December, Sweden Valley experiences an average high-temperature of 33.4°F (0.8°C) and a low-temperature of 23.7°F (-4.6°C).

What is the average humidity in December?

In Sweden Valley, the average relative humidity in December is 87%.

How much does it rain in December?

In Sweden Valley, in December, it is raining for 10.4 days, with typically 2.8" (71mm) of accumulated precipitation.

How many days does it snow in December?

In Sweden Valley, during December, snow falls for 19.6 days and regularly aggregates up to 9.96" (253mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

In December, the average day length is 9h and 13min.

When is the sunrise / sunset in December in Sweden Valley?

In December, on the first day of the month, sunrise is at 7:20 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 4:51 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 2.7h.

What are the months with the lowest UV index?

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

What is the UV index reading in December?

In Sweden Valley, the average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a low health threat 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
Sweden Valley, PA

Average temperature in December - Sweden Valley, PA
  • Average high temperature in December: 33.4°F

The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (27.7°F).

  • Average low temperature in December: 23.7°F

The month with the highest average low temperature is July (56.1°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).

Average pressure in December
Sweden Valley, PA

Average pressure in December - Sweden Valley, 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
Sweden Valley, PA

Average wind speed in December - Sweden Valley, PA
  • Average wind speed in December: 8.8mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

Average humidity in December
Sweden Valley, PA

Average humidity in December - Sweden Valley, PA
  • Average humidity in December: 87%

The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are June and July (78%).

Average rainfall in December
Sweden Valley, PA

Average rainfall in December - Sweden Valley, PA
  • Average rainfall in December: 2.8"

The wettest month (with the highest rainfall) is April (3.62").
The driest month (with the least rainfall) is August (2.09").

Average rainfall days in December
Sweden Valley, PA

Average rainfall days in December - Sweden Valley, PA
  • Average rainfall days in December: 10.4 days

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (7.2 days).

Average snowfall in December
Sweden Valley, PA

Average snowfall in December - Sweden Valley, PA
  • Average snowfall in December: 9.96"

The month with the highest snowfall is February (12.09").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Sweden Valley, PA

Average snowfall days in December - Sweden Valley, PA
  • Average snowfall days in December: 19.6 days

The month with the highest number of snowfall days is January (21.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Sweden Valley, PA

Average daylight in December / Average sunshine in December - Sweden Valley, 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: 2h and 4min

The months with the most sunshine are July and August (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).

Average sunshine days in December
Sweden Valley, PA

Average sunshine days in December - Sweden Valley, PA
  • Average sunshine days in December: 5.9 days

The month with the most sunshine days is September (13.5 days).
The month with the least sunshine days is February (4.7 days).

Average UV index in December
Sweden Valley, PA

Average UV index in December - Sweden Valley, 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
Sweden Valley, PA

Average cloud cover in December - Sweden Valley, PA
  • Average cloud cover in December: 75

The month with the most cloud cover is January (Cloud cover 76).
The month with the least cloud cover is July (Cloud cover 42).

Average visibility in December
Sweden Valley, PA

Average visibility in December - Sweden Valley, PA
  • Average visibility in December: 4mi

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

Sweden Valley, Pennsylvania, USA

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