December weather forecast
Montgomeryville, PA

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Weather in December

The first month of the winter, December, is still a cold month in Montgomeryville, Pennsylvania, with an average temperature fluctuating between 30.7°F (-0.7°C) and 42.1°F (5.6°C).

Temperature

The onset of December coincides with a reduction in the average high-temperature, falling from a cool 51.3°F (10.7°C) in November to a wintry 42.1°F (5.6°C). The temperature lowers to an average of 30.7°F (-0.7°C) during December nights.

Humidity

February, October and December, with an average relative humidity of 79%, are the most humid months.

Rainfall

In December, the rain falls for 7.3 days. Throughout December, 1.02" (26mm) of precipitation is accumulated. In Montgomeryville, during the entire year, the rain falls for 116.6 days and collects up to 10.63" (270mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In Montgomeryville, in December, snow falls for 1.8 days, with typically accumulated 0.43" (11mm) of snow. Throughout the year, in Montgomeryville, there are 14.8 snowfall days, and 3.5" (89mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:35 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:45 pm EST.

Sunshine

In December, the average sunshine is 5h.

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 value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the average person.
Note: In December, an average UV index of 2 transforms into the following instructions:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

Frequently asked questions

How cold is December?

An average high-temperature, in December, in Montgomeryville, is 42.1°F (5.6°C) and the average low-temperature is 30.7°F (-0.7°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, is computed to be 87.8°F (31°C).

What are the most humid months?

The months with the highest humidity are February, October and December, with an average relative humidity of 79%.

What is the average humidity in December?

In December, the average relative humidity in Montgomeryville is 79%.

How many days does it rain in December?

In Montgomeryville, during December, the rain falls for 7.3 days and regularly aggregates up to 1.02" (26mm) of precipitation.

How many days does it snow in December?

In Montgomeryville, during December, snow falls for 1.8 days and regularly aggregates up to 0.43" (11mm) of snow.

What is the month with the shortest days?

With an average of 9h and 24min of daylight, December has the shortest days of the year.

How many hours of daylight does Montgomeryville have in December?

In Montgomeryville, the average day length in December is 9h and 22min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 4:35 pm. On the last day of the month, in Montgomeryville, sunrise is at 7:23 am and sunset at 4:45 pm EST.

How many hours of sunshine does Montgomeryville have in December?

In December, the average sunshine duration is 5h.

What is the month with the lowest UV index?

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

How high is the UV index in December?

In Montgomeryville, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents 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
Montgomeryville, PA

Average temperature in December - Montgomeryville, PA
  • Average high temperature in December: 42.1°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (35.6°F).

  • Average low temperature in December: 30.7°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).

Average pressure in December
Montgomeryville, PA

Average pressure in December - Montgomeryville, 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
Montgomeryville, PA

Average wind speed in December - Montgomeryville, PA
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in December
Montgomeryville, PA

Average humidity in December - Montgomeryville, PA
  • Average humidity in December: 79%

The months with the highest relative humidity are February, October and December (79%).
The months with the lowest relative humidity are April, July and August (73%).

Average rainfall in December
Montgomeryville, PA

Average rainfall in December - Montgomeryville, PA
  • Average rainfall in December: 1.02"

The wettest month (with the highest rainfall) is July (1.3").
The driest month (with the least rainfall) is September (0.59").

Average rainfall days in December
Montgomeryville, PA

Average rainfall days in December - Montgomeryville, PA
  • Average rainfall days in December: 7.3 days

The month with the highest number of rainy days is July (13.8 days).
The months with the least rainy days are January and February (6.3 days).

Average snowfall in December
Montgomeryville, PA

Average snowfall in December - Montgomeryville, PA
  • Average snowfall in December: 0.43"

The month with the highest snowfall is March (1.02").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Montgomeryville, PA

Average snowfall days in December - Montgomeryville, PA
  • Average snowfall days in December: 1.8 days

The month with the highest number of snowfall days is January (4.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Montgomeryville, 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 24min).

  • Average sunshine in December: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in December
Montgomeryville, PA

Average sunshine days in December - Montgomeryville, PA
  • Average sunshine days in December: 21.7 days

The month with the most sunshine days is November (22.3 days).
The month with the least sunshine days is July (13.9 days).

Average UV index in December
Montgomeryville, PA

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

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

Average cloud cover in December - Montgomeryville, PA
  • Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
Montgomeryville, PA

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

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

Montgomeryville, Pennsylvania, USA

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