December weather forecast
Merryman Heights, MD

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Weather in December

The first month of the winter, December, is still a chilly month in Merryman Heights, Maryland, with an average temperature ranging between max 43.5°F (6.4°C) and min 31.5°F (-0.3°C).

Temperature

The average high-temperature shows a slight dip in December, from November's fresh 52.3°F (11.3°C) to a frosty 43.5°F (6.4°C). Throughout December, Merryman Heights witnesses a consistent average low-temperature of 31.5°F (-0.3°C).

Humidity

The average relative humidity in December is 77%.

Rainfall

In Merryman Heights, in December, during 10.5 rainfall days, 2.4" (61mm) of precipitation is typically accumulated. Throughout the year, there are 159 rainfall days, and 31.61" (803mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, November and December. In Merryman Heights, in December, during 3.2 snowfall days, 1.54" (39mm) of snow is typically accumulated. In Merryman Heights, during the entire year, snow falls for 18.7 days and aggregates up to 9.96" (253mm) of snow.

Daylight

December has the shortest days of the year in Merryman Heights, 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 4:44 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:54 pm EST.

Sunshine

In Merryman Heights, the average sunshine in December is 5.1h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

Frequently asked questions

Is December cold?

The high-temperature, in December, in Merryman Heights, records 43.5°F (6.4°C), while the low-temperature is 31.5°F (-0.3°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is computed to be 89.6°F (32°C).

What is the average humidity in December in Merryman Heights?

In December, the average relative humidity is 77%.

How much does it rain in December?

In Merryman Heights, during December, the rain falls for 10.5 days and regularly aggregates up to 2.4" (61mm) of precipitation.

How much does it snow in December?

In December, in Merryman Heights, it is snowing for 3.2 days. Throughout December, 1.54" (39mm) of snow is accumulated.

What is the month with the shortest days?

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

How many hours of daylight does Merryman Heights have in December?

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

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:09 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:54 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 5.1h.

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 reading in December?

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

Average temperature in December - Merryman Heights, MD
  • Average high temperature in December: 43.5°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (37.6°F).

  • Average low temperature in December: 31.5°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 (25°F).

Average pressure in December
Merryman Heights, MD

Average pressure in December - Merryman Heights, 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
Merryman Heights, MD

Average wind speed in December - Merryman Heights, MD
  • Average wind speed in December: 8mph

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity in December
Merryman Heights, MD

Average humidity in December - Merryman Heights, MD
  • Average humidity in December: 77%

The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are April and July (74%).

Average rainfall in December
Merryman Heights, MD

Average rainfall in December - Merryman Heights, 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 (1.97").

Average rainfall days in December
Merryman Heights, MD

Average rainfall days in December - Merryman Heights, MD
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is January (8.6 days).

Average snowfall in December
Merryman Heights, MD

Average snowfall in December - Merryman Heights, MD
  • Average snowfall in December: 1.54"

The month with the highest snowfall is March (2.8").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Merryman Heights, MD

Average snowfall days in December - Merryman Heights, MD
  • Average snowfall days in December: 3.2 days

The month with the highest number of snowfall days is January (5.6 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
Merryman Heights, MD

Average daylight in December / Average sunshine in December - Merryman Heights, 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: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 4h and 48min).

Average sunshine days in December
Merryman Heights, MD

Average sunshine days in December - Merryman Heights, MD
  • Average sunshine days in December: 17.4 days

The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is May (11.2 days).

Average UV index in December
Merryman Heights, MD

Average UV index in December - Merryman Heights, 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
Merryman Heights, MD

Average cloud cover in December - Merryman Heights, MD
  • Average cloud cover in December: 46

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

Average visibility in December
Merryman Heights, MD

Average visibility in December - Merryman Heights, 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).

Merryman Heights, Maryland, USA

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