December weather forecast
Helfenstein, PA

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Weather in December

The first month of the winter, December, is still a cold month in Helfenstein, Pennsylvania, with temperature in the range of an average low of 27.7°F (-2.4°C) and an average high of 38.3°F (3.5°C).

Temperature

With December's onset, the weather shows a temperature decrease, transitioning from a frosty 47.8°F (8.8°C) in November to a wintry 38.3°F (3.5°C). Helfenstein records a steady low-temperature average of 27.7°F (-2.4°C) during December.

Humidity

The average relative humidity in December is 81%.

Rainfall

In Helfenstein, during December, the rain falls for 8.3 days and regularly aggregates up to 1.1" (28mm) of precipitation. In Helfenstein, during the entire year, the rain falls for 129.2 days and collects up to 16.42" (417mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Helfenstein, Pennsylvania, in December, during 5.5 snowfall days, 1.06" (27mm) of snow is typically accumulated. In Helfenstein, during the entire year, snow falls for 28.6 days and aggregates up to 9.37" (238mm) 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 7:11 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:48 pm EST.

Sunshine

In Helfenstein, the average sunshine in December is 4.3h.

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 estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 2 during December leads to these instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Updated: Aug 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December in Helfenstein?

The average high-temperature and low-temperature during December are 38.3°F (3.5°C) and 27.7°F (-2.4°C) respectively. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, in July is calculated to be 87.8°F (31°C).

What is the average humidity in December?

The average relative humidity in December is 81%.

How many days does it rain in December?

In Helfenstein, Pennsylvania, in December, during 8.3 rainfall days, 1.1" (28mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Helfenstein, in December, snow falls for 5.5 days, with typically accumulated 1.06" (27mm) 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.

What is the average length of the day in December?

The average day length in December is 9h and 19min.

When are sunrise and sunset in December?

On the first day of December in Helfenstein, sunrise is at 7:11 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:48 pm EST.

How many hours of sunshine does Helfenstein have in December?

In December, the average sunshine duration is 4.3h.

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

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

What is the UV index reading in December?

In Helfenstein, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health threat 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
Helfenstein, PA

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

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (32°F).

  • Average low temperature in December: 27.7°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 (20.1°F).

Average pressure in December
Helfenstein, PA

Average pressure in December - Helfenstein, 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
Helfenstein, PA

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

The windiest months (with the highest average wind speed) are March and April (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

Average humidity in December
Helfenstein, PA

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

The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are March and April (77%).

Average rainfall in December
Helfenstein, PA

Average rainfall in December - Helfenstein, PA
  • Average rainfall in December: 1.1"

The wettest months (with the highest rainfall) are May and July (1.97").
The driest month (with the least rainfall) is February (0.98").

Average rainfall days in December
Helfenstein, PA

Average rainfall days in December - Helfenstein, PA
  • Average rainfall days in December: 8.3 days

The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (5.8 days).

Average snowfall in December
Helfenstein, PA

Average snowfall in December - Helfenstein, PA
  • Average snowfall in December: 1.06"

The month with the highest snowfall is February (2.2").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Helfenstein, PA

Average snowfall days in December - Helfenstein, PA
  • Average snowfall days in December: 5.5 days

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

Average daylight in December / Average sunshine in December - Helfenstein, 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 2min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).

Average sunshine days in December
Helfenstein, PA

Average sunshine days in December - Helfenstein, PA
  • Average sunshine days in December: 18.4 days

The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is May (12.5 days).

Average UV index in December
Helfenstein, PA

Average UV index in December - Helfenstein, PA
  • Average UV index in December: 2

The month with the highest UV index is June (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
Helfenstein, PA

Average cloud cover in December - Helfenstein, PA
  • Average cloud cover in December: 55

The month with the most cloud cover is February (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in December
Helfenstein, PA

Average visibility in December - Helfenstein, PA
  • Average visibility in December: 6mi

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

Helfenstein, Pennsylvania, USA

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