December weather forecast
Julian, PA

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Weather in December

The first month of the winter, December, is also an icy month in Julian, Pennsylvania, with an average temperature fluctuating between 26.4°F (-3.1°C) and 36.9°F (2.7°C).

Temperature

Setting in of December comes with a decrease in the average high-temperature, moving from a frosty 46.8°F (8.2°C) in November to a wintry 36.9°F (2.7°C). During the nights in December, Julian experiences a consistent average temperature of 26.4°F (-3.1°C).

Humidity

February and December, with an average relative humidity of 84%, are the most humid months.

Rainfall

In Julian, during December, the rain falls for 12.6 days and regularly aggregates up to 2.52" (64mm) of precipitation. Throughout the year, there are 175.7 rainfall days, and 30.94" (786mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Julian, during December, snow falls for 11.5 days and regularly aggregates up to 4.45" (113mm) of snow. Throughout the year, there are 59 snowfall days, and 26.3" (668mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Julian, Pennsylvania, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:17 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:54 pm EST.

Sunshine

The average sunshine in December is 3.7h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In December, a daily maximum UV index of 1 leads to the following instructions:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Always opt for UVA and UVB-resistant sunglasses on radiant days. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.

Frequently asked questions

How cold is it in December?

In December, in Julian, the average high-temperature is 36.9°F (2.7°C), and the average low-temperature is 26.4°F (-3.1°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, in July is calculated to be 87.8°F (31°C).

What are the most humid months in Julian?

The months with the highest humidity are February and December, with an average relative humidity of 84%.

What is the average humidity in December?

The average relative humidity in December is 84%.

How many days does it rain in December?

In Julian, in December, it is raining for 12.6 days, with typically 2.52" (64mm) of accumulated precipitation.

How much does it snow in December?

In Julian, during December, snow falls for 11.5 days and regularly aggregates up to 4.45" (113mm) of snow.

What is the month with the shortest days?

With an average of 9h and 18min of daylight, December has the shortest days of the year.

How many hours of daylight does Julian have in December?

In Julian, the average day length in December is 9h and 18min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:17 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:54 pm EST.

How many hours of sunshine does Julian have in December?

In December, the average sunshine duration is 3.7h.

What is the month with the lowest UV index?

With an average maximum UV index of 1, December is the month with the lowest UV index.

What is the UV index intensity in December?

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

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

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (31.1°F).

  • Average low temperature in December: 26.4°F

The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).

Average pressure in December
Julian, PA

Average pressure in December - Julian, PA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in December
Julian, PA

Average wind speed in December - Julian, PA
  • Average wind speed in December: 7.4mph

The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Julian, PA

Average humidity in December - Julian, PA
  • Average humidity in December: 84%

The months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is July (76%).

Average rainfall in December
Julian, PA

Average rainfall in December - Julian, PA
  • Average rainfall in December: 2.52"

The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is November (2.01").

Average rainfall days in December
Julian, PA

Average rainfall days in December - Julian, PA
  • Average rainfall days in December: 12.6 days

The month with the highest number of rainy days is May (19.4 days).
The month with the least rainy days is February (9.8 days).

Average snowfall in December
Julian, PA

Average snowfall in December - Julian, PA
  • Average snowfall in December: 4.45"

The month with the highest snowfall is February (6.77").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Julian, PA

Average snowfall days in December - Julian, PA
  • Average snowfall days in December: 11.5 days

The month with the highest number of snowfall days is January (15.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Julian, 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 4min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

Average sunshine days in December
Julian, PA

Average sunshine days in December - Julian, PA
  • Average sunshine days in December: 12 days

The month with the most sunshine days is November (14.5 days).
The month with the least sunshine days is February (8.5 days).

Average UV index in December
Julian, PA

Average UV index in December - Julian, 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
Julian, PA

Average cloud cover in December - Julian, PA
  • Average cloud cover in December: 61

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 36).

Average visibility in December
Julian, PA

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

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

Julian, Pennsylvania, USA

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