December weather forecast
Katellen, PA

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Weather in December

December, the first month of the winter in Katellen, is also an icy month, with an average temperature fluctuating between 39°F (3.9°C) and 28°F (-2.2°C).

Temperature

Katellen, Pennsylvania, in December demonstrates a small temperature transition, adjusting from an average high of a frosty 48.6°F (9.2°C) in November to an icy 39°F (3.9°C). An average low-temperature of 28°F (-2.2°C) is common during the nights of December.

Humidity

The average relative humidity in December in Katellen is 81%.

Rainfall

In Katellen, during December, the rain falls for 13.1 days and regularly aggregates up to 3.19" (81mm) of precipitation. In Katellen, during the entire year, the rain falls for 167 days and collects up to 33.5" (851mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Katellen. In Katellen, in December, during 6.1 snowfall days, 3.19" (81mm) of snow is typically accumulated. Throughout the year, there are 33.8 snowfall days, and 17.91" (455mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of December in Katellen, Pennsylvania, sunrise is at 7:07 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:43 pm EST.

Sunshine

The average sunshine in December is 4.7h.

UV index

December is the month with the lowest UV index in Katellen, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index of 1 during December translates into these guidelines:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
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Frequently asked questions

Is December cold in Katellen?

An average high-temperature, in December, in Katellen, is 39°F (3.9°C) and the average low-temperature is 28°F (-2.2°C). In July, the average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, is evaluated at 89.6°F (32°C).

What is the average humidity in December in Katellen?

In December, the average relative humidity is 81%.

How much does it rain in Katellen in December?

In Katellen, Pennsylvania, in December, it is raining for 13.1 days, with typically 3.19" (81mm) of accumulated precipitation.

How much does it snow in Katellen in December?

In December, it is snowing for 6.1 days. Throughout December, 3.19" (81mm) of snow is accumulated.

What is the month with the shortest days in Katellen?

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

What is the average length of the day in December in Katellen?

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

When are sunrise and sunset in December in Katellen?

On the first day of December, sunrise is at 7:07 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:43 pm EST.

How long on average sun shines in December in Katellen?

In Katellen, Pennsylvania, the average sunshine duration in December is 4.7h.

What is the month with the lowest UV index in Katellen?

The month with the lowest UV index in Katellen, Pennsylvania, is December, with an average maximum UV index of 1.

What is the UV index reading in December in Katellen?

In December, the average daily maximum UV index is 1. A UV Index reading of 2, and below, represents a low health risk from 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
Katellen, PA

Average temperature in December - Katellen, PA
  • Average high temperature in December: 39°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in December: 28°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).

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Average pressure in December
Katellen, PA

Average pressure in December - Katellen, 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).

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Average wind speed in December
Katellen, PA

Average wind speed in December - Katellen, 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 (5mph).

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Average humidity in December
Katellen, PA

Average humidity in December - Katellen, PA
  • Average humidity in December: 81%

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

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Average rainfall in December
Katellen, PA

Average rainfall in December - Katellen, PA
  • Average rainfall in December: 3.19"

The wettest month (with the highest rainfall) is July (3.46").
The driest month (with the least rainfall) is September (2.01").

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Average rainfall days in December
Katellen, PA

Average rainfall days in December - Katellen, PA
  • Average rainfall days in December: 13.1 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (9.9 days).

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Average snowfall in December
Katellen, PA

Average snowfall in December - Katellen, PA
  • Average snowfall in December: 3.19"

The month with the highest snowfall is February (4.88").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Katellen, PA

Average snowfall days in December - Katellen, PA
  • Average snowfall days in December: 6.1 days

The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Katellen, 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: 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).

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Average sunshine days in December
Katellen, PA

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

The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is June (10.9 days).

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Average UV index in December
Katellen, PA

Average UV index in December - Katellen, 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).

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Average cloud cover in December
Katellen, PA

Average cloud cover in December - Katellen, PA
  • Average cloud cover in December: 51

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 34).

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Average visibility in December
Katellen, PA

Average visibility in December - Katellen, 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).

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Katellen, Pennsylvania, USA

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