December weather forecast
Allison, PA

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Weather in December

December, the first month of the winter in Allison, is also a wintry month, with an average temperature ranging between max 40.1°F (4.5°C) and min 28.8°F (-1.8°C).

Temperature

As December begins, there is a decrease in the average high-temperature, falling from a cool 50°F (10°C) in November to a wintry 40.1°F (4.5°C). During December nights, Allison witnesses a consistent average temperature of 28.8°F (-1.8°C).

Humidity

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

Rainfall

In Allison, during December, the rain falls for 5 days and regularly aggregates up to 0.51" (13mm) of precipitation. Throughout the year, there are 82.6 rainfall days, and 6.1" (155mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall in Allison. The months with the most snowfall are February and December, with an average 0.35" (9mm) of accumulated snow.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:22 am and sunset at 4:54 pm. On the last day of December, sunrise is at 7:41 am and sunset at 5:04 pm EST.

Sunshine

The average sunshine in December is 3.5h.

UV index

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 2 during December translates into the following directions:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

Frequently asked questions

How cold is it in December?

In Allison, in December, the average high-temperature is 40.1°F (4.5°C), and the average low-temperature is 28.8°F (-1.8°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is estimated at 87.8°F (31°C).

What is the average humidity in December?

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

How much does it rain in December?

In December, the rain falls for 5 days. Throughout December, 0.51" (13mm) of precipitation is accumulated.

What is the snowiest month?

The months with the most snowfall are February and December, with an average 0.35" (9mm) of accumulated snow.

How many days does it snow in December?

In December, it is snowing for 3.6 days. Throughout December, 0.35" (9mm) of snow is accumulated.

What is the month with the shortest days?

With an average of 9h and 24min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

The average day length in December is 9h and 23min.

When is the sunrise / sunset in December in Allison?

On the first day of December, sunrise is at 7:22 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 5:04 pm EST.

How many hours of sunshine does Allison have in December?

In Allison, the average sunshine duration in December is 3.5h.

When is the lowest UV index?

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index intensity in December?

The average daily maximum UV index in December in Allison is 2. A UV Index estimate of 2, and below, represents a low health risk 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
Allison, PA

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

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in December: 28.8°F

The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

Average pressure in December
Allison, PA

Average pressure in December - Allison, PA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in December
Allison, PA

Average wind speed in December - Allison, PA
  • Average wind speed in December: 7.2mph

The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).

Average humidity in December
Allison, PA

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

The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are April, July, August and November (77%).

Average rainfall in December
Allison, PA

Average rainfall in December - Allison, PA
  • Average rainfall in December: 0.51"

The wettest month (with the highest rainfall) is May (0.71").
The driest month (with the least rainfall) is September (0.28").

Average rainfall days in December
Allison, PA

Average rainfall days in December - Allison, PA
  • Average rainfall days in December: 5 days

The month with the highest number of rainy days is July (9.8 days).
The month with the least rainy days is February (4 days).

Average snowfall in December
Allison, PA

Average snowfall in December - Allison, PA
  • Average snowfall in December: 0.35"

The months with the highest snowfall are February and December (0.35").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Allison, PA

Average snowfall days in December - Allison, PA
  • Average snowfall days in December: 3.6 days

The month with the highest number of snowfall days is January (6.3 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
Allison, PA

Average daylight in December / Average sunshine in December - Allison, 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 24min).

  • Average sunshine in December: 3h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in December
Allison, PA

Average sunshine days in December - Allison, PA
  • Average sunshine days in December: 22.4 days

The month with the most sunshine days is November (23.2 days).
The month with the least sunshine days is June (17.3 days).

Average UV index in December
Allison, PA

Average UV index in December - Allison, 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, October, November and December (UV index 2).

Average cloud cover in December
Allison, PA

Average cloud cover in December - Allison, PA
  • Average cloud cover in December: 64

The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 35).

Average visibility in December
Allison, PA

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

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

Allison, Pennsylvania, USA

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