December weather forecast
Washington Grove, MD

Share

Weather in December

December, the first month of the winter in Washington Grove, is still a chilly month, with an average temperature varying between 44.2°F (6.8°C) and 32.2°F (0.1°C).

Temperature

December brings a slight decrease in the average high-temperature, shifting from a fresh 53.1°F (11.7°C) in November to a frosty 44.2°F (6.8°C). Throughout the month of December, Washington Grove witnesses an average temperature of 32.2°F (0.1°C).

Humidity

May, October and December, with an average relative humidity of 77%, are the most humid months.

Rainfall

In Washington Grove, in December, during 10.5 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. Throughout the year, there are 154.8 rainfall days, and 29.09" (739mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, November and December. In Washington Grove, during December, snow falls for 2.5 days and regularly aggregates up to 1.38" (35mm) of snow. Throughout the year, there are 16.7 snowfall days, and 9.76" (248mm) 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 December, sunrise is at 7:09 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:56 pm EST.

Sunshine

The months with the least sunshine are January, February and December, with an average of 5.1h of sunshine.

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 of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the maximum UV index of 2 translates into these guidelines:
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. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.

Frequently asked questions

How cold is December?

In Washington Grove, 44.2°F (6.8°C) is the average high-temperature and 32.2°F (0.1°C) is the average low-temperature during December. In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is estimated at 93.2°F (34°C).

What is the most humid month?

May, October and December, with an average relative humidity of 77%, are most humid months.

What is the average humidity in December?

The average relative humidity in December is 77%.

How much does it rain in December?

In Washington Grove, during December, the rain falls for 10.5 days and regularly aggregates up to 2.09" (53mm) of precipitation.

How many days does it snow in December?

In Washington Grove, in December, during 2.5 snowfall days, 1.38" (35mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 30min of daylight.

How many hours of daylight does Washington Grove have in December?

In Washington Grove, the average day length in December is 9h and 28min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:09 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:56 pm EST.

What is the month with the least sunshine?

The months with the least sunshine are January, February and December, with an average of 5.1h of sunshine.

How many hours of sunshine does Washington Grove have in December?

The average sunshine duration in December is 5.1h.

When is 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.

How high is the UV index in December?

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

Average temperature in December - Washington Grove, MD
  • Average high temperature in December: 44.2°F

The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in December: 32.2°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).

Average pressure in December
Washington Grove, MD

Average pressure in December - Washington Grove, 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
Washington Grove, MD

Average wind speed in December - Washington Grove, MD
  • Average wind speed in December: 7.1mph

The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

Average humidity in December
Washington Grove, MD

Average humidity in December - Washington Grove, MD
  • Average humidity in December: 77%

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

Average rainfall in December
Washington Grove, MD

Average rainfall in December - Washington Grove, MD
  • Average rainfall in December: 2.09"

The wettest month (with the highest rainfall) is August (3.82").
The driest month (with the least rainfall) is January (1.73").

Average rainfall days in December
Washington Grove, MD

Average rainfall days in December - Washington Grove, MD
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (8.7 days).

Average snowfall in December
Washington Grove, MD

Average snowfall in December - Washington Grove, MD
  • Average snowfall in December: 1.38"

The month with the highest snowfall is January (2.76").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Washington Grove, MD

Average snowfall days in December - Washington Grove, MD
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is February (5.3 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
Washington Grove, MD

Average daylight in December / Average sunshine in December - Washington Grove, 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 48min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).

Average sunshine days in December
Washington Grove, MD

Average sunshine days in December - Washington Grove, MD
  • Average sunshine days in December: 18.4 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (11.5 days).

Average UV index in December
Washington Grove, MD

Average UV index in December - Washington Grove, 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
Washington Grove, MD

Average cloud cover in December - Washington Grove, 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
Washington Grove, MD

Average visibility in December - Washington Grove, 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).

Washington Grove, Maryland, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location