December weather forecast
Highlands of Olney, MD

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Weather in December

The first month of the winter, December, is still a chilly month in Highlands of Olney, Maryland, with an average temperature ranging between max 45.3°F (7.4°C) and min 32.9°F (0.5°C).

Temperature

The onset of December entails a subtle temperature shift, as the average high-temperature eases from a cool 53.4°F (11.9°C) in November to a chilly 45.3°F (7.4°C). Highlands of Olney observes an average low-temperature of 32.9°F (0.5°C) during December.

Humidity

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

Rainfall

In Highlands of Olney, in December, it is raining for 10.2 days, with typically 2.76" (70mm) of accumulated precipitation. Throughout the year, there are 160.9 rainfall days, and 32.99" (838mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In Highlands of Olney, during December, snow falls for 2.9 days and regularly aggregates up to 1.38" (35mm) of snow. In Highlands of Olney, during the entire year, snow falls for 17.1 days and aggregates up to 10.2" (259mm) of snow.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:09 am and sunset at 4:45 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:55 pm EST.

Sunshine

The average sunshine in December is 5.1h.

UV index

January, 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 unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 2 during December translates into the following directions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in December in Highlands of Olney?

In December, the average high-temperature and low-temperature are 45.3°F (7.4°C) and 32.9°F (0.5°C) respectively. In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines air temperature and relative humidity, is computed to be 93.2°F (34°C).

What is the most humid month?

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

What is the average humidity in December?

In Highlands of Olney, the average relative humidity in December is 76%.

How much does it rain in December?

In Highlands of Olney, during December, the rain falls for 10.2 days and regularly aggregates up to 2.76" (70mm) of precipitation.

How many days does it snow in December?

In December, it is snowing for 2.9 days. Throughout December, 1.38" (35mm) of snow is 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.

What is the average length of the day in December?

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

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:09 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:55 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 5.1h.

What is the month with the lowest UV index?

January, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index reading in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability 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
Highlands of Olney, MD

Average temperature in December - Highlands of Olney, MD
  • Average high temperature in December: 45.3°F

The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39°F).

  • Average low temperature in December: 32.9°F

The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

Average pressure in December
Highlands of Olney, MD

Average pressure in December - Highlands of Olney, 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
Highlands of Olney, MD

Average wind speed in December - Highlands of Olney, MD
  • Average wind speed in December: 7.1mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in December
Highlands of Olney, MD

Average humidity in December - Highlands of Olney, MD
  • Average humidity in December: 76%

The months with the highest relative humidity are May, October and December (76%).
The month with the lowest relative humidity is July (70%).

Average rainfall in December
Highlands of Olney, MD

Average rainfall in December - Highlands of Olney, MD
  • Average rainfall in December: 2.76"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.17").

Average rainfall days in December
Highlands of Olney, MD

Average rainfall days in December - Highlands of Olney, MD
  • Average rainfall days in December: 10.2 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in December
Highlands of Olney, MD

Average snowfall in December - Highlands of Olney, MD
  • Average snowfall in December: 1.38"

The months with the highest snowfall are January and March (3.03").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Highlands of Olney, MD

Average snowfall days in December - Highlands of Olney, MD
  • Average snowfall days in December: 2.9 days

The months with the highest number of snowfall days are January and February (5.1 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
Highlands of Olney, MD

Average daylight in December / Average sunshine in December - Highlands of Olney, 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 month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in December
Highlands of Olney, MD

Average sunshine days in December - Highlands of Olney, MD
  • Average sunshine days in December: 17.5 days

The month with the most sunshine days is November (19.4 days).
The months with the least sunshine days are May and July (11 days).

Average UV index in December
Highlands of Olney, MD

Average UV index in December - Highlands of Olney, 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, November and December (UV index 2).

Average cloud cover in December
Highlands of Olney, MD

Average cloud cover in December - Highlands of Olney, 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 31).

Average visibility in December
Highlands of Olney, MD

Average visibility in December - Highlands of Olney, 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).

Highlands of Olney, Maryland, USA

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