December weather forecast
Monumental, MD

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Weather in December

The first month of the winter, December, is also a frosty month in Monumental, Maryland, with an average temperature ranging between min 33.4°F (0.8°C) and max 44.8°F (7.1°C).

Temperature

Monumental's weather subtly changes with the onset of December, barely falling from a cool 53.2°F (11.8°C) in November to a frosty 44.8°F (7.1°C). Monumental's nighttime temperature in December drops to an average of 33.4°F (0.8°C).

Humidity

In December, the average relative humidity in Monumental is 75%.

Rainfall

In Monumental, in December, during 10.1 rainfall days, 2.36" (60mm) of precipitation is typically accumulated. In Monumental, during the entire year, the rain falls for 158.5 days and collects up to 30.75" (781mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall. In December, it is snowing for 2.2 days. Throughout December, 0.63" (16mm) of snow is accumulated. Throughout the year, there are 12.8 snowfall days, and 6.06" (154mm) 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 7:07 am and sunset at 4:44 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:53 pm EST.

Sunshine

The average sunshine in December 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. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, the UV index of 2 transforms into the following advice:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. To protect against the Sun's most potent rays, avoid direct exposure around midday. To cut down UV radiation exposure by about half, sport a wide-brim hat. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Updated: Jul 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Monumental in December?

Monumental in December has an average high-temperature of 44.8°F (7.1°C) and an average low-temperature of 33.4°F (0.8°C). In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is estimated at 89.6°F (32°C).

What is the average humidity in December?

In Monumental, the average relative humidity in December is 75%.

How many days does it rain in December?

In Monumental, during December, the rain falls for 10.1 days and regularly aggregates up to 2.36" (60mm) of precipitation.

How many days does it snow in December?

In Monumental, during December, snow falls for 2.2 days and regularly aggregates up to 0.63" (16mm) of snow.

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.

How many hours of daylight does Monumental have in December?

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

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:07 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:53 pm EST.

How many hours of sunshine does Monumental 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 Monumental?

In Monumental, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health threat 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
Monumental, MD

Average temperature in December - Monumental, MD
  • Average high temperature in December: 44.8°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (38.5°F).

  • Average low temperature in December: 33.4°F

The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (27.1°F).

Average pressure in December
Monumental, MD

Average pressure in December - Monumental, 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
Monumental, MD

Average wind speed in December - Monumental, MD
  • Average wind speed in December: 8.4mph

The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

Average humidity in December
Monumental, MD

Average humidity in December - Monumental, MD
  • Average humidity in December: 75%

The month with the highest relative humidity is May (77%).
The months with the lowest relative humidity are April, July and November (72%).

Average rainfall in December
Monumental, MD

Average rainfall in December - Monumental, MD
  • Average rainfall in December: 2.36"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (1.85").

Average rainfall days in December
Monumental, MD

Average rainfall days in December - Monumental, MD
  • Average rainfall days in December: 10.1 days

The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is November (8.4 days).

Average snowfall in December
Monumental, MD

Average snowfall in December - Monumental, MD
  • Average snowfall in December: 0.63"

The month with the highest snowfall is January (2.09").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Monumental, MD

Average snowfall days in December - Monumental, MD
  • Average snowfall days in December: 2.2 days

The month with the highest number of snowfall days is January (4.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Monumental, MD

Average daylight in December / Average sunshine in December - Monumental, 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 February (Average sunshine: 5h and 0min).

Average sunshine days in December
Monumental, MD

Average sunshine days in December - Monumental, MD
  • Average sunshine days in December: 18.2 days

The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is May (10.3 days).

Average UV index in December
Monumental, MD

Average UV index in December - Monumental, 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
Monumental, MD

Average cloud cover in December - Monumental, MD
  • Average cloud cover in December: 44

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in December
Monumental, MD

Average visibility in December - Monumental, MD
  • Average visibility in December: 6mi

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

Monumental, Maryland, USA

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