December weather forecast
Blackrock Hills, MD

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Weather in December

The first month of the winter, December, is still a chilly month in Blackrock Hills, Maryland, with an average temperature fluctuating between 31.8°F (-0.1°C) and 44.2°F (6.8°C).

Temperature

In December, the meteorological conditions change slightly, with the average high-temperature moving from a fresh 53.1°F (11.7°C) in November to a frosty 44.2°F (6.8°C). Blackrock Hills, during December nights, observes an average temperature of 31.8°F (-0.1°C).

Humidity

October and December, with an average relative humidity of 78%, are the most humid months.

Rainfall

In Blackrock Hills, in December, during 10.5 rainfall days, 2.36" (60mm) of precipitation is typically accumulated. Throughout the year, there are 159.4 rainfall days, and 30.71" (780mm) of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall. In December, it is snowing for 3 days. Throughout December, 1.57" (40mm) of snow is accumulated. Throughout the year, there are 19.1 snowfall days, and 10.04" (255mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:10 am and sunset at 4:46 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:56 pm EST.

Sunshine

In December, the average sunshine is 5.2h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Blackrock Hills. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Updated: Aug 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

The average high-temperature and low-temperature during December are 44.2°F (6.8°C) and 31.8°F (-0.1°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, is appraised at 93.2°F (34°C).

What is the most humid month in Blackrock Hills?

October and December, with an average relative humidity of 78%, are most humid months.

What is the average humidity in December?

In Blackrock Hills, the average relative humidity in December is 78%.

How much does it rain in December?

In Blackrock Hills, Maryland, during December, the rain falls for 10.5 days and regularly aggregates up to 2.36" (60mm) of precipitation.

How much does it snow in December?

In December, it is snowing for 3 days. Throughout December, 1.57" (40mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 30min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 28min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:10 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:56 pm EST.

How many hours of sunshine does Blackrock Hills have in December?

The average sunshine duration in December is 5.2h.

What are the months with the lowest UV index?

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

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health 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
Blackrock Hills, MD

Average temperature in December - Blackrock Hills, MD
  • Average high temperature in December: 44.2°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in December: 31.8°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 (25.2°F).

Average pressure in December
Blackrock Hills, MD

Average pressure in December - Blackrock Hills, 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
Blackrock Hills, MD

Average wind speed in December - Blackrock Hills, MD
  • Average wind speed in December: 7mph

The windiest month (with the highest average wind speed) is March (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

Average humidity in December
Blackrock Hills, MD

Average humidity in December - Blackrock Hills, MD
  • Average humidity in December: 78%

The months with the highest relative humidity are October and December (78%).
The month with the lowest relative humidity is July (72%).

Average rainfall in December
Blackrock Hills, MD

Average rainfall in December - Blackrock Hills, MD
  • Average rainfall in December: 2.36"

The wettest month (with the highest rainfall) is August (3.78").
The driest months (with the least rainfall) are January and February (1.97").

Average rainfall days in December
Blackrock Hills, MD

Average rainfall days in December - Blackrock Hills, MD
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (17.5 days).
The months with the least rainy days are January and November (9.5 days).

Average snowfall in December
Blackrock Hills, MD

Average snowfall in December - Blackrock Hills, MD
  • Average snowfall in December: 1.57"

The month with the highest snowfall is March (2.83").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Blackrock Hills, MD

Average snowfall days in December - Blackrock Hills, MD
  • Average snowfall days in December: 3 days

The months with the highest number of snowfall days are January and February (5.8 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
Blackrock Hills, MD

Average daylight in December / Average sunshine in December - Blackrock Hills, MD
  • Average daylight in December: 9h and 3min

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 30min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).

Average sunshine days in December
Blackrock Hills, MD

Average sunshine days in December - Blackrock Hills, MD
  • Average sunshine days in December: 18.2 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is July (11.3 days).

Average UV index in December
Blackrock Hills, MD

Average UV index in December - Blackrock Hills, MD
  • 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, November and December (UV index 2).

Average cloud cover in December
Blackrock Hills, MD

Average cloud cover in December - Blackrock Hills, MD
  • Average cloud cover in December: 45

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in December
Blackrock Hills, MD

Average visibility in December - Blackrock Hills, MD
  • Average visibility in December: 6mi

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

Blackrock Hills, Maryland, USA

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