December weather forecast
Rocky Forge, MD

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Weather in December

The first month of the winter, December, is also a wintry month in Rocky Forge, Maryland, with an average temperature varying between 41.2°F (5.1°C) and 29.1°F (-1.6°C).

Temperature

As December commences, the average high-temperature shows a reduction, transitioning from a fresh 50.2°F (10.1°C) in November to a wintry 41.2°F (5.1°C). Rocky Forge's average low-temperature for the month of December records at a subzero cold 29.1°F (-1.6°C).

Humidity

In December, the average relative humidity in Rocky Forge, Maryland, is 79%.

Rainfall

In Rocky Forge, during December, the rain falls for 10.5 days and regularly aggregates up to 2.4" (61mm) of precipitation. In Rocky Forge, during the entire year, the rain falls for 158.5 days and collects up to 31.3" (795mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. In Rocky Forge, Maryland, during December, snow falls for 6.1 days and regularly aggregates up to 2.99" (76mm) of snow. In Rocky Forge, Maryland, during the entire year, snow falls for 33 days and aggregates up to 22.44" (570mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:12 am and sunset at 4:46 pm. On the last day of December, sunrise is at 7:31 am and sunset at 4:56 pm EST.

Sunshine

In Rocky Forge, the average sunshine in December is 4.7h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for average individuals.
Note: The maximum UV index, 2 during December, leads to the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Experience reduced UV exposure by about half when donning a wide-brim hat. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.

Frequently asked questions

How cold is December?

In Rocky Forge, 41.2°F (5.1°C) is the average high-temperature and 29.1°F (-1.6°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 87.8°F (31°C).

What is the average humidity in December?

The average relative humidity in December is 79%.

How much does it rain in December?

In Rocky Forge, in December, during 10.5 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

How much does it snow in Rocky Forge in December?

In Rocky Forge, during December, snow falls for 6.1 days and regularly aggregates up to 2.99" (76mm) of snow.

What is the month with the shortest days?

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

How many hours of daylight does Rocky Forge have in December?

In December, the average day length is 9h and 25min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:12 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:56 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 4.7h.

What are the months with the lowest UV index?

January, February, 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 Rocky Forge, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe 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
Rocky Forge, MD

Average temperature in December - Rocky Forge, MD
  • Average high temperature in December: 41.2°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (35.8°F).

  • Average low temperature in December: 29.1°F

The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

Average pressure in December
Rocky Forge, MD

Average pressure in December - Rocky Forge, MD
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in December
Rocky Forge, MD

Average wind speed in December - Rocky Forge, MD
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).

Average humidity in December
Rocky Forge, MD

Average humidity in December - Rocky Forge, MD
  • Average humidity in December: 79%

The month with the highest relative humidity is October (80%).
The month with the lowest relative humidity is July (75%).

Average rainfall in December
Rocky Forge, MD

Average rainfall in December - Rocky Forge, MD
  • Average rainfall in December: 2.4"

The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is September (2.01").

Average rainfall days in December
Rocky Forge, MD

Average rainfall days in December - Rocky Forge, MD
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (8.2 days).

Average snowfall in December
Rocky Forge, MD

Average snowfall in December - Rocky Forge, MD
  • Average snowfall in December: 2.99"

The month with the highest snowfall is January (6.81").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Rocky Forge, MD

Average snowfall days in December - Rocky Forge, MD
  • 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 May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Rocky Forge, MD

Average daylight in December / Average sunshine in December - Rocky Forge, MD
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 4h and 4min

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 30min).

Average sunshine days in December
Rocky Forge, MD

Average sunshine days in December - Rocky Forge, MD
  • Average sunshine days in December: 16.4 days

The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is May (10.6 days).

Average UV index in December
Rocky Forge, MD

Average UV index in December - Rocky Forge, MD
  • 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, November and December (UV index 2).

Average cloud cover in December
Rocky Forge, MD

Average cloud cover in December - Rocky Forge, MD
  • 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 33).

Average visibility in December
Rocky Forge, MD

Average visibility in December - Rocky Forge, MD
  • Average visibility in December: 5mi

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

Rocky Forge, Maryland, USA

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