December weather forecast
Blue Grass Manor, MD

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Weather in December

The first month of the winter, December, is also a frosty month in Blue Grass Manor, Maryland, with an average temperature varying between 30.4°F (-0.9°C) and 42.8°F (6°C).

Temperature

Start of December brings a slight shift in the average high-temperature, dipping a bit from November's cool 51.3°F (10.7°C) to a chilly 42.8°F (6°C). Blue Grass Manor in December anticipates an average nighttime temperature of 30.4°F (-0.9°C).

Humidity

In December, the average relative humidity in Blue Grass Manor, Maryland, is 79%.

Rainfall

In Blue Grass Manor, in December, it is raining for 11 days, with typically 2.4" (61mm) of accumulated precipitation. In Blue Grass Manor, during the entire year, the rain falls for 158.9 days and collects up to 32.68" (830mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Blue Grass Manor, in December, snow falls for 3.9 days, with typically accumulated 1.93" (49mm) of snow. In Blue Grass Manor, during the entire year, snow falls for 23.9 days and aggregates up to 13.31" (338mm) of snow.

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 7:09 am and sunset at 4:43 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:53 pm EST.

Sunshine

The average sunshine in December is 4.9h.

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 estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 2 in December transforms into the following instructions:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.

Frequently asked questions

How cold is it in December?

December temperatures vary between a high-temperature of 42.8°F (6°C) and a low-temperature of 30.4°F (-0.9°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines air temperature and relative humidity, in August is evaluated at 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 79%.

How many days does it rain in December?

In Blue Grass Manor, in December, it is raining for 11 days, with typically 2.4" (61mm) of accumulated precipitation.

How much does it snow in December?

In Blue Grass Manor, in December, during 3.9 snowfall days, 1.93" (49mm) of snow is typically accumulated.

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.

What is the average length of the day in December?

In December, the average day length is 9h and 26min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:09 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:53 pm EST.

How many hours of sunshine does Blue Grass Manor have in December?

In December, the average sunshine duration is 4.9h.

What is the month 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?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's 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
Blue Grass Manor, MD

Average temperature in December - Blue Grass Manor, MD
  • Average high temperature in December: 42.8°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (36.9°F).

  • Average low temperature in December: 30.4°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

Average pressure in December
Blue Grass Manor, MD

Average pressure in December - Blue Grass Manor, 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 (29.94"Hg).

Average wind speed in December
Blue Grass Manor, MD

Average wind speed in December - Blue Grass Manor, MD
  • Average wind speed in December: 8.1mph

The windiest months (with the highest average wind speed) are February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in December
Blue Grass Manor, MD

Average humidity in December - Blue Grass Manor, MD
  • Average humidity in December: 79%

The month with the highest relative humidity is May (81%).
The months with the lowest relative humidity are January, April, July and November (76%).

Average rainfall in December
Blue Grass Manor, MD

Average rainfall in December - Blue Grass Manor, MD
  • Average rainfall in December: 2.4"

The wettest month (with the highest rainfall) is August (3.9").
The driest month (with the least rainfall) is February (2.13").

Average rainfall days in December
Blue Grass Manor, MD

Average rainfall days in December - Blue Grass Manor, MD
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (8.4 days).

Average snowfall in December
Blue Grass Manor, MD

Average snowfall in December - Blue Grass Manor, MD
  • Average snowfall in December: 1.93"

The month with the highest snowfall is March (4.06").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Blue Grass Manor, MD

Average snowfall days in December - Blue Grass Manor, MD
  • Average snowfall days in December: 3.9 days

The month with the highest number of snowfall days is January (6.9 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
Blue Grass Manor, MD

Average daylight in December / Average sunshine in December - Blue Grass Manor, 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 5min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

Average sunshine days in December
Blue Grass Manor, MD

Average sunshine days in December - Blue Grass Manor, MD
  • Average sunshine days in December: 17.1 days

The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is July (11.6 days).

Average UV index in December
Blue Grass Manor, MD

Average UV index in December - Blue Grass Manor, 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
Blue Grass Manor, MD

Average cloud cover in December - Blue Grass Manor, MD
  • Average cloud cover in December: 48

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

Average visibility in December
Blue Grass Manor, MD

Average visibility in December - Blue Grass Manor, MD
  • 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).

Blue Grass Manor, Maryland, USA

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