December weather forecast
Callery, PA

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Weather in December

The first month of the winter, December, is still a cold month in Callery, Pennsylvania, with an average temperature varying between 27.5°F (-2.5°C) and 38.3°F (3.5°C).

Temperature

A shift in Callery's weather is observed as November turns into December, with the average high temperature reducing from a chilly 48.4°F (9.1°C) to a cold 38.3°F (3.5°C). Throughout December, the temperature falls to an average low of 27.5°F (-2.5°C).

Humidity

In Callery, the average relative humidity in December is 85%.

Rainfall

In Callery, in December, during 11.9 rainfall days, 2.87" (73mm) of precipitation is typically accumulated. Throughout the year, there are 184.5 rainfall days, and 36.54" (928mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Callery, Pennsylvania, in December, during 13 snowfall days, 4.49" (114mm) of snow is typically accumulated. In Callery, during the entire year, snow falls for 63.9 days and aggregates up to 24.06" (611mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:25 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 5:02 pm EST.

Sunshine

In December, the average sunshine is 3.2h.

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 minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, a daily UV index of 1 turns into the following recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.

Frequently asked questions

Is it cold during December?

In December, in Callery, the average high-temperature is 38.3°F (3.5°C), and the average low-temperature is 27.5°F (-2.5°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is computed to be 86°F (30°C).

What is the average humidity in December?

In Callery, the average relative humidity in December is 85%.

How many days does it rain in December?

In December, in Callery, the rain falls for 11.9 days. Throughout December, 2.87" (73mm) of precipitation is accumulated.

How much does it snow in December?

In Callery, in December, snow falls for 13 days, with typically accumulated 4.49" (114mm) 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 Callery have in December?

In Callery, the average day length in December is 9h and 19min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:25 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 5:02 pm EST.

How many hours of sunshine does Callery have in December?

In Callery, the average sunshine duration in December is 3.2h.

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 reading in December?

The average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a low health threat 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
Callery, PA

Average temperature in December - Callery, PA
  • Average high temperature in December: 38.3°F

The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (31.8°F).

  • Average low temperature in December: 27.5°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

Average pressure in December
Callery, PA

Average pressure in December - Callery, 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 (29.94"Hg).

Average wind speed in December
Callery, PA

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

The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

Average humidity in December
Callery, PA

Average humidity in December - Callery, PA
  • Average humidity in December: 85%

The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are April, July and August (77%).

Average rainfall in December
Callery, PA

Average rainfall in December - Callery, PA
  • Average rainfall in December: 2.87"

The wettest month (with the highest rainfall) is April (3.82").
The driest month (with the least rainfall) is November (2.24").

Average rainfall days in December
Callery, PA

Average rainfall days in December - Callery, PA
  • Average rainfall days in December: 11.9 days

The month with the highest number of rainy days is May (20.6 days).
The month with the least rainy days is January (10.3 days).

Average snowfall in December
Callery, PA

Average snowfall in December - Callery, PA
  • Average snowfall in December: 4.49"

The month with the highest snowfall is January (6.38").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Callery, PA

Average snowfall days in December - Callery, PA
  • Average snowfall days in December: 13 days

The month with the highest number of snowfall days is January (17.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Callery, 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: 3h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).

Average sunshine days in December
Callery, PA

Average sunshine days in December - Callery, PA
  • Average sunshine days in December: 9.8 days

The month with the most sunshine days is November (14.3 days).
The month with the least sunshine days is February (7.2 days).

Average UV index in December
Callery, PA

Average UV index in December - Callery, PA
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Callery, PA

Average cloud cover in December - Callery, PA
  • Average cloud cover in December: 67

The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 34).

Average visibility in December
Callery, PA

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

The month with the highest visibility is April (6mi).
The months with the lowest visibility are January and February (4mi).

Callery, Pennsylvania, USA

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