December weather forecast
Poolesville, MD

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Weather in December

The first month of the winter, December, is still a chilly month in Poolesville, Maryland, with an average temperature varying between 31.6°F (-0.2°C) and 44.2°F (6.8°C).

Temperature

The arrival of December corresponds with a temperature reduction, down from November's fresh 53.2°F (11.8°C) to a chilly 44.2°F (6.8°C). The average low-temperature of 31.6°F (-0.2°C) is witnessed during December.

Humidity

October and December, with an average relative humidity of 78%, are the most humid months.

Rainfall

In Poolesville, in December, during 7.2 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. Throughout the year, there are 115.4 rainfall days, and 10.59" (269mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In Poolesville, in December, during 2.1 snowfall days, 0.47" (12mm) of snow is typically accumulated. In Poolesville, during the entire year, snow falls for 12.7 days and aggregates up to 2.24" (57mm) 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 7:10 am and sunset at 4:47 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:57 pm EST.

Sunshine

The average sunshine in December is 5.1h.

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 hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
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. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Updated: Aug 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature during December is 44.2°F (6.8°C) and the low-temperature is 31.6°F (-0.2°C). The average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, in August is estimated at 93.2°F (34°C).

What is the most humid month in Poolesville?

October and December, with an average relative humidity of 78%, are most humid months.

What is the average humidity in December?

The average relative humidity in December is 78%.

How much does it rain in Poolesville in December?

In Poolesville, in December, it is raining for 7.2 days, with typically 0.67" (17mm) of accumulated precipitation.

How many days does it snow in December?

In Poolesville, in December, during 2.1 snowfall days, 0.47" (12mm) of snow is typically accumulated.

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 Poolesville have in December?

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

When is the sunrise / sunset in December in Poolesville?

On the first day of December, sunrise is at 7:10 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:57 pm EST.

How many hours of sunshine does Poolesville have in December?

In December, the average sunshine duration is 5.1h.

When is the lowest UV index in Poolesville?

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?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability 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
Poolesville, MD

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

The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in December: 31.6°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 (25.2°F).

Average pressure in December
Poolesville, MD

Average pressure in December - Poolesville, 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
Poolesville, MD

Average wind speed in December - Poolesville, MD
  • Average wind speed in December: 6.8mph

The windiest month (with the highest average wind speed) is March (7.6mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

Average humidity in December
Poolesville, MD

Average humidity in December - Poolesville, MD
  • Average humidity in December: 78%

The months with the highest relative humidity are October and December (78%).
The month with the lowest relative humidity is July (72%).

Average rainfall in December
Poolesville, MD

Average rainfall in December - Poolesville, MD
  • Average rainfall in December: 0.67"

The wettest month (with the highest rainfall) is August (1.5").
The driest month (with the least rainfall) is September (0.51").

Average rainfall days in December
Poolesville, MD

Average rainfall days in December - Poolesville, MD
  • Average rainfall days in December: 7.2 days

The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is January (6.1 days).

Average snowfall in December
Poolesville, MD

Average snowfall in December - Poolesville, MD
  • Average snowfall in December: 0.47"

The month with the highest snowfall is January (0.75").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Poolesville, MD

Average snowfall days in December - Poolesville, MD
  • Average snowfall days in December: 2.1 days

The month with the highest number of snowfall days is February (4.1 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
Poolesville, MD

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

Average sunshine days in December
Poolesville, MD

Average sunshine days in December - Poolesville, MD
  • Average sunshine days in December: 21.5 days

The month with the most sunshine days is January (21.9 days).
The month with the least sunshine days is May (14.6 days).

Average UV index in December
Poolesville, MD

Average UV index in December - Poolesville, 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
Poolesville, MD

Average cloud cover in December - Poolesville, MD
  • Average cloud cover in December: 45

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in December
Poolesville, MD

Average visibility in December - Poolesville, 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).

Poolesville, Maryland, USA

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