December weather forecast
Royersford, PA

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Weather in December

December, the first month of the winter in Royersford, is also an icy month, with an average temperature ranging between min 30.9°F (-0.6°C) and max 42.3°F (5.7°C).

Temperature

The advent of December brings a subtle shift in temperature, with the average high moving from a cool 51.1°F (10.6°C) in November to an icy 42.3°F (5.7°C). December is noted for a mean low-temperature of 30.9°F (-0.6°C).

Humidity

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

Rainfall

In December, the rain falls for 7.9 days. Throughout December, 0.98" (25mm) of precipitation is accumulated. In Royersford, during the entire year, the rain falls for 132.3 days and collects up to 13.98" (355mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall. In Royersford, in December, snow falls for 2.5 days, with typically accumulated 0.51" (13mm) of snow. Throughout the year, there are 15.1 snowfall days, and 2.2" (56mm) of snow is accumulated.

Daylight

With an average of 9h and 24min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:05 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:46 pm EST.

Sunshine

In December, the average sunshine is 4.8h.

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 reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum UV index, 2 during December, leads to the following recommendations:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.

Frequently asked questions

How cold is December?

December temperatures vary between a high-temperature of 42.3°F (5.7°C) and a low-temperature of 30.9°F (-0.6°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in August is calculated to be 89.6°F (32°C).

What is the average humidity in December?

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

How much does it rain in December?

In Royersford, during December, the rain falls for 7.9 days and regularly aggregates up to 0.98" (25mm) of precipitation.

How many days does it snow in December?

In Royersford, during December, snow falls for 2.5 days and regularly aggregates up to 0.51" (13mm) 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 Royersford have in December?

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

When are sunrise and sunset in December?

On the first day of December in Royersford, sunrise is at 7:05 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:46 pm EST.

How many hours of sunshine does Royersford have in December?

The average sunshine duration in December is 4.8h.

What is the month with 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?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk 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
Royersford, PA

Average temperature in December - Royersford, PA
  • Average high temperature in December: 42.3°F

The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (36°F).

  • Average low temperature in December: 30.9°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

Average pressure in December
Royersford, PA

Average pressure in December - Royersford, PA
  • Average pressure in December: 30.1"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
Royersford, PA

Average wind speed in December - Royersford, PA
  • Average wind speed in December: 7.7mph

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
Royersford, PA

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

The month with the highest relative humidity is February (80%).
The months with the lowest relative humidity are April and July (74%).

Average rainfall in December
Royersford, PA

Average rainfall in December - Royersford, PA
  • Average rainfall in December: 0.98"

The wettest month (with the highest rainfall) is August (1.77").
The driest month (with the least rainfall) is February (0.75").

Average rainfall days in December
Royersford, PA

Average rainfall days in December - Royersford, PA
  • Average rainfall days in December: 7.9 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (6.9 days).

Average snowfall in December
Royersford, PA

Average snowfall in December - Royersford, PA
  • Average snowfall in December: 0.51"

The months with the highest snowfall are January and February (0.59").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Royersford, PA

Average snowfall days in December - Royersford, PA
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is February (4.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Royersford, 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: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

Average sunshine days in December
Royersford, PA

Average sunshine days in December - Royersford, PA
  • Average sunshine days in December: 20.4 days

The month with the most sunshine days is January (20.7 days).
The month with the least sunshine days is June (12.8 days).

Average UV index in December
Royersford, PA

Average UV index in December - Royersford, 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
Royersford, PA

Average cloud cover in December - Royersford, PA
  • Average cloud cover in December: 48

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Royersford, PA

Average visibility in December - Royersford, 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).

Royersford, Pennsylvania, USA

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