December weather forecast
Sally Ann, PA

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Weather in December

The first month of the winter, December, is also an icy month in Sally Ann, Pennsylvania, with an average temperature varying between 29.1°F (-1.6°C) and 40.1°F (4.5°C).

Temperature

Arrival of December comes with a reduction in the average high-temperature, falling from a frosty 49.8°F (9.9°C) in November to a cold 40.1°F (4.5°C). During the nights in December, Sally Ann experiences a consistent average temperature of 29.1°F (-1.6°C).

Humidity

In Sally Ann, Pennsylvania, the average relative humidity in December is 80%.

Rainfall

In Sally Ann, during December, the rain falls for 10.1 days and regularly aggregates up to 2.05" (52mm) of precipitation. Throughout the year, there are 147.9 rainfall days, and 25.94" (659mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. In Sally Ann, in December, during 4.5 snowfall days, 1.5" (38mm) of snow is typically accumulated. Throughout the year, there are 24.9 snowfall days, and 13.54" (344mm) of snow is accumulated.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:07 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:46 pm EST.

Sunshine

In December, the average sunshine is 4.7h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 2 during December leads to these advisories:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Updated: Jun 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

The high-temperature, in December, in Sally Ann, records 40.1°F (4.5°C), while the low-temperature is 29.1°F (-1.6°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is appraised at 86°F (30°C).

What is the average humidity in December?

In Sally Ann, the average relative humidity in December is 80%.

How many days does it rain in December?

In December, the rain falls for 10.1 days. Throughout December, 2.05" (52mm) of precipitation is accumulated.

How much does it snow in December?

In Sally Ann, during December, snow falls for 4.5 days and regularly aggregates up to 1.5" (38mm) 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 Sally Ann have in December?

The average day length in December is 9h and 20min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:07 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:46 pm EST.

How many hours of sunshine does Sally Ann have in December?

In Sally Ann, the average sunshine duration in December is 4.7h.

What are the months with the lowest UV index?

The months with the lowest UV index in Sally Ann are January through March, November and December, with an average maximum UV index of 2.

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to 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
Sally Ann, PA

Average temperature in December - Sally Ann, PA
  • Average high temperature in December: 40.1°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in December: 29.1°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).

Average pressure in December
Sally Ann, PA

Average pressure in December - Sally Ann, 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
Sally Ann, PA

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

The windiest month (with the highest average wind speed) is March (8.2mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Sally Ann, PA

Average humidity in December - Sally Ann, PA
  • Average humidity in December: 80%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (76%).

Average rainfall in December
Sally Ann, PA

Average rainfall in December - Sally Ann, PA
  • Average rainfall in December: 2.05"

The wettest month (with the highest rainfall) is August (2.8").
The driest month (with the least rainfall) is September (1.54").

Average rainfall days in December
Sally Ann, PA

Average rainfall days in December - Sally Ann, PA
  • Average rainfall days in December: 10.1 days

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (7.2 days).

Average snowfall in December
Sally Ann, PA

Average snowfall in December - Sally Ann, PA
  • Average snowfall in December: 1.5"

The month with the highest snowfall is January (4.02").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Sally Ann, PA

Average snowfall days in December - Sally Ann, PA
  • Average snowfall days in December: 4.5 days

The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Sally Ann, PA

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

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in December
Sally Ann, PA

Average sunshine days in December - Sally Ann, PA
  • Average sunshine days in December: 17.4 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is May (11 days).

Average UV index in December
Sally Ann, PA

Average UV index in December - Sally Ann, PA
  • Average UV index in December: 2

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in December
Sally Ann, PA

Average cloud cover in December - Sally Ann, PA
  • Average cloud cover in December: 51

The months with the most cloud cover are February and December (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Sally Ann, PA

Average visibility in December - Sally Ann, PA
  • Average visibility in December: 5mi

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

Sally Ann, Pennsylvania, USA

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