December weather forecast
East Riverdale, MD

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Weather in December

The first month of the winter, December, is also a frosty month in East Riverdale, Maryland, with temperature in the range of an average high of 45.5°F (7.5°C) and an average low of 34.3°F (1.3°C).

Temperature

December's arrival comes with a mild decrease in the average high-temperature, moving subtly from a cool 54.1°F (12.3°C) in November to a frosty 45.5°F (7.5°C). Throughout December, East Riverdale witnesses a nighttime temperature average of 34.3°F (1.3°C).

Humidity

The months with the highest humidity are May, October and December, with an average relative humidity of 76%.

Rainfall

In East Riverdale, Maryland, in December, it is raining for 9.8 days, with typically 2.6" (66mm) of accumulated precipitation. Throughout the year, there are 157.9 rainfall days, and 31.14" (791mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April and December. December is the first month it typically snows. Throughout December, in the average 2.4 snowfall days, it receives 0.67" (17mm) of snow. In East Riverdale, during the entire year, snow falls for 13.5 days and aggregates up to 7.2" (183mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:08 am and sunset at 4:45 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:55 pm EST.

Sunshine

In East Riverdale, the average sunshine in December is 5.1h.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the average person.
Note: The maximum daily UV index of 2 in December converts into the following recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.

Frequently asked questions

What is the usual temperature for East Riverdale in December?

The high-temperature, in December, in East Riverdale, is 45.5°F (7.5°C), while the low-temperature averages to 34.3°F (1.3°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, is computed to be 93.2°F (34°C).

What are the most humid months in East Riverdale?

May, October and December, with an average relative humidity of 76%, are most humid months.

What is the average humidity in December?

In East Riverdale, the average relative humidity in December is 76%.

How much does it rain in December?

In December, in East Riverdale, the rain falls for 9.8 days. Throughout December, 2.6" (66mm) of precipitation is accumulated.

When does it start snowing?

December is the first month it typically snows. Throughout December, in the average 2.4 snowfall days, it receives 0.67" (17mm) of snow.

What is the month with the shortest days?

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

How many hours of daylight does East Riverdale have in December?

In December, the average day length is 9h and 29min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:08 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:55 pm EST.

How many hours of sunshine does East Riverdale have in December?

In East Riverdale, the average sunshine duration in December is 5.1h.

What is the month with the lowest UV index?

January 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?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents 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
East Riverdale, MD

Average temperature in December - East Riverdale, MD
  • Average high temperature in December: 45.5°F

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.9°F).

  • Average low temperature in December: 34.3°F

The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

Average pressure in December
East Riverdale, MD

Average pressure in December - East Riverdale, 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
East Riverdale, MD

Average wind speed in December - East Riverdale, MD
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in December
East Riverdale, MD

Average humidity in December - East Riverdale, MD
  • Average humidity in December: 76%

The months with the highest relative humidity are May, October and December (76%).
The months with the lowest relative humidity are April and July (71%).

Average rainfall in December
East Riverdale, MD

Average rainfall in December - East Riverdale, MD
  • Average rainfall in December: 2.6"

The wettest month (with the highest rainfall) is August (3.58").
The driest month (with the least rainfall) is January (2.01").

Average rainfall days in December
East Riverdale, MD

Average rainfall days in December - East Riverdale, MD
  • Average rainfall days in December: 9.8 days

The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is November (9 days).

Average snowfall in December
East Riverdale, MD

Average snowfall in December - East Riverdale, MD
  • Average snowfall in December: 0.67"

The month with the highest snowfall is January (2.6").
The months with the least snowfall are May, June, July, August, September, October and November (0").

Average snowfall days in December
East Riverdale, MD

Average snowfall days in December - East Riverdale, MD
  • Average snowfall days in December: 2.4 days

The month with the highest number of snowfall days is January (4.1 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
East Riverdale, MD

Average daylight in December / Average sunshine in December - East Riverdale, 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
East Riverdale, MD

Average sunshine days in December - East Riverdale, MD
  • Average sunshine days in December: 18.1 days

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in December
East Riverdale, MD

Average UV index in December - East Riverdale, 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 and December (UV index 2).

Average cloud cover in December
East Riverdale, MD

Average cloud cover in December - East Riverdale, 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 29).

Average visibility in December
East Riverdale, MD

Average visibility in December - East Riverdale, 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).

East Riverdale, Maryland, USA

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