December weather forecast
Hellertown, PA

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Weather in December

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

Temperature

The beginning of December marks a decrease in the average high-temperature, transitioning from a cool 50°F (10°C) in November to a wintry 40.1°F (4.5°C). Throughout December, Hellertown witnesses a nighttime temperature average of 28.8°F (-1.8°C).

Humidity

The average relative humidity in December is 80%.

Rainfall

In Hellertown, in December, during 10.7 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. Throughout the year, there are 153 rainfall days, and 26.81" (681mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 4.8 days. Throughout December, 2.48" (63mm) of snow is accumulated. In Hellertown, during the entire year, snow falls for 26.7 days and aggregates up to 14.49" (368mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:06 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:44 pm EST.

Sunshine

In December, the average sunshine is 4.7h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily high UV index of 2 during December translates into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Boost your sun resistance with garments that are densely woven yet spacious. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.

Frequently asked questions

Is it cold during December?

In Hellertown, 40.1°F (4.5°C) is the average high-temperature and 28.8°F (-1.8°C) is the average low-temperature during December. The average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines air temperature and relative humidity, in August is appraised at 86°F (30°C).

What is the average humidity in December?

In Hellertown, Pennsylvania, the average relative humidity in December is 80%.

How many days does it rain in December?

In December, the rain falls for 10.7 days. Throughout December, 2.24" (57mm) of precipitation is accumulated.

How many days does it snow in December?

In Hellertown, in December, snow falls for 4.8 days, with typically accumulated 2.48" (63mm) 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 Hellertown have in December?

The average day length in December is 9h and 20min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:06 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:44 pm EST.

How many hours of sunshine does Hellertown have in December?

The average sunshine duration in December is 4.7h.

When is the lowest UV index?

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?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health 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
Hellertown, PA

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

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in December: 28.8°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in December
Hellertown, PA

Average pressure in December - Hellertown, 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).

Average wind speed in December
Hellertown, PA

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

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in December
Hellertown, PA

Average humidity in December - Hellertown, PA
  • Average humidity in December: 80%

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

Average rainfall in December
Hellertown, PA

Average rainfall in December - Hellertown, PA
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is July (2.91").
The driest month (with the least rainfall) is September (1.57").

Average rainfall days in December
Hellertown, PA

Average rainfall days in December - Hellertown, PA
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (7.8 days).

Average snowfall in December
Hellertown, PA

Average snowfall in December - Hellertown, PA
  • Average snowfall in December: 2.48"

The month with the highest snowfall is March (4.13").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Hellertown, PA

Average snowfall days in December - Hellertown, PA
  • Average snowfall days in December: 4.8 days

The months with the highest number of snowfall days are January and February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Hellertown, 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 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).

Average sunshine days in December
Hellertown, PA

Average sunshine days in December - Hellertown, PA
  • Average sunshine days in December: 17.2 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (11 days).

Average UV index in December
Hellertown, PA

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

The months with the highest UV index are May, June and July (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
Hellertown, PA

Average cloud cover in December - Hellertown, PA
  • Average cloud cover in December: 50

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in December
Hellertown, PA

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

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

Hellertown, Pennsylvania, USA

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