December weather forecast
Allens, PA

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Weather in December

December, the first month of the winter in Allens, is also an icy month, with an average temperature ranging between max 36.9°F (2.7°C) and min 26.8°F (-2.9°C).

Temperature

Arrival of December comes with a reduction in the average high-temperature, falling from a frosty 46.6°F (8.1°C) in November to a cold 36.9°F (2.7°C). Allens, in the month of December, anticipates a consistent average low-temperature of 26.8°F (-2.9°C).

Humidity

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

Rainfall

In Allens, during December, the rain falls for 11.5 days and regularly aggregates up to 2.28" (58mm) of precipitation. Throughout the year, in Allens, there are 170.2 rainfall days, and 32.2" (818mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Allens, in December, snow falls for 8.2 days, with typically accumulated 3.23" (82mm) of snow. Throughout the year, there are 41.9 snowfall days, and 19.76" (502mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:14 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:33 am and sunset at 4:49 pm EST.

Sunshine

The average sunshine in December is 3.9h.

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 threat to health from exposure to the Sun's UV radiation for the average person.
Note: In December, the maximum UV index of 1 suggests these recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.

Frequently asked questions

How cold is December?

The average high-temperature and low-temperature in Allens during December are 36.9°F (2.7°C) and 26.8°F (-2.9°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, in July is estimated at 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 83%.

How many days does it rain in December?

In December, the rain falls for 11.5 days. Throughout December, 2.28" (58mm) of precipitation is accumulated.

How many days does it snow in December?

In Allens, Pennsylvania, during December, snow falls for 8.2 days and regularly aggregates up to 3.23" (82mm) of snow.

What is the month with the shortest days?

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

How many hours of daylight does Allens have in December?

In Allens, the average day length in December is 9h and 16min.

When is the sunrise / sunset in December?

On the first day of December in Allens, sunrise is at 7:14 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 4:49 pm EST.

How many hours of sunshine does Allens have in December?

The average sunshine duration in December is 3.9h.

What is the month with the lowest UV index?

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

What is the UV index intensity in December?

In Allens, the average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a minimal health vulnerability 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
Allens, PA

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

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.7°F).

  • Average low temperature in December: 26.8°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 (19°F).

Average pressure in December
Allens, PA

Average pressure in December - Allens, PA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Allens, PA

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

The windiest months (with the highest average wind speed) are January, March and April (7.6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Allens, PA

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

The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is April (77%).

Average rainfall in December
Allens, PA

Average rainfall in December - Allens, PA
  • Average rainfall in December: 2.28"

The wettest month (with the highest rainfall) is July (3.43").
The driest month (with the least rainfall) is November (1.93").

Average rainfall days in December
Allens, PA

Average rainfall days in December - Allens, PA
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is July (19.4 days).
The month with the least rainy days is February (8.8 days).

Average snowfall in December
Allens, PA

Average snowfall in December - Allens, PA
  • Average snowfall in December: 3.23"

The month with the highest snowfall is February (6.18").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Allens, PA

Average snowfall days in December - Allens, PA
  • Average snowfall days in December: 8.2 days

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Allens, 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 5min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).

Average sunshine days in December
Allens, PA

Average sunshine days in December - Allens, PA
  • Average sunshine days in December: 14.8 days

The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is July (9.9 days).

Average UV index in December
Allens, PA

Average UV index in December - Allens, 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
Allens, PA

Average cloud cover in December - Allens, PA
  • Average cloud cover in December: 59

The months with the most cloud cover are January, February and December (Cloud cover 59).
The month with the least cloud cover is July (Cloud cover 36).

Average visibility in December
Allens, PA

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

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

Allens, Pennsylvania, USA

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