December weather forecast
Mount Aetna, MD

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Weather in December

The first month of the winter, December, is also an icy month in Mount Aetna, Maryland, with an average temperature fluctuating between 42.3°F (5.7°C) and 30.2°F (-1°C).

Temperature

The move into December indicates a reduction in the average high-temperature, down from November's fresh 51.6°F (10.9°C) to a wintry 42.3°F (5.7°C). Throughout December, Mount Aetna witnesses a nighttime temperature average of 30.2°F (-1°C).

Humidity

The months with the highest humidity are May, October and December, with an average relative humidity of 79%.

Rainfall

In Mount Aetna, in December, it is raining for 10.8 days, with typically 2.2" (56mm) of accumulated precipitation. In Mount Aetna, during the entire year, the rain falls for 162.4 days and collects up to 30.16" (766mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. In Mount Aetna, Maryland, during December, snow falls for 4.5 days and regularly aggregates up to 2.09" (53mm) of snow. Throughout the year, there are 24.4 snowfall days, and 14.29" (363mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of December, sunrise is at 7:12 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:56 pm EST.

Sunshine

In Mount Aetna, Maryland, the average sunshine in December is 4.8h.

UV index

The months with the lowest UV index in Mount Aetna are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum daily UV index of 2 during December morphs into the following directions:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
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Frequently asked questions

How cold is December in Mount Aetna?

In Mount Aetna, 42.3°F (5.7°C) is the average high-temperature and 30.2°F (-1°C) is the average low-temperature during December. The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 91.4°F (33°C).

What are the most humid months in Mount Aetna?

The months with the highest humidity are May, October and December, with an average relative humidity of 79%.

What is the average humidity in December in Mount Aetna?

The average relative humidity in December in Mount Aetna is 79%.

How much does it rain in Mount Aetna in December?

In Mount Aetna, Maryland, in December, it is raining for 10.8 days, with typically 2.2" (56mm) of accumulated precipitation.

How many days does it snow in December in Mount Aetna?

In Mount Aetna, Maryland, during December, snow falls for 4.5 days and regularly aggregates up to 2.09" (53mm) of snow.

What is the month with the shortest days in Mount Aetna?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

How many hours of daylight does Mount Aetna have in December?

In Mount Aetna, the average day length in December is 9h and 26min.

When is the sunrise / sunset in December in Mount Aetna?

In December, on the first day of the month, sunrise is at 7:12 am and sunset at 4:46 pm. On the last day of the month, in Mount Aetna, Maryland, sunrise is at 7:31 am and sunset at 4:56 pm EST.

How long on average sun shines in December in Mount Aetna?

The average sunshine duration in December is 4.8h.

What are the months with the lowest UV index in Mount Aetna?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Mount Aetna, Maryland.

What is the UV index intensity in December in Mount Aetna?

In Mount Aetna, the average daily maximum UV index in December is 2. A UV Index reading 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
Mount Aetna, MD

Average temperature in December - Mount Aetna, MD
  • Average high temperature in December: 42.3°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in December: 30.2°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).

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Average pressure in December
Mount Aetna, MD

Average pressure in December - Mount Aetna, 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).

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Average wind speed in December
Mount Aetna, MD

Average wind speed in December - Mount Aetna, MD
  • Average wind speed in December: 7mph

The windiest months (with the highest average wind speed) are January, February and March (7.6mph).
The calmest months (with the lowest average wind speed) are July and August (4.5mph).

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Average humidity in December
Mount Aetna, MD

Average humidity in December - Mount Aetna, MD
  • Average humidity in December: 79%

The months with the highest relative humidity are May, October and December (79%).
The month with the lowest relative humidity is July (74%).

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Average rainfall in December
Mount Aetna, MD

Average rainfall in December - Mount Aetna, MD
  • Average rainfall in December: 2.2"

The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is January (1.97").

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Average rainfall days in December
Mount Aetna, MD

Average rainfall days in December - Mount Aetna, MD
  • Average rainfall days in December: 10.8 days

The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is November (9.4 days).

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Average snowfall in December
Mount Aetna, MD

Average snowfall in December - Mount Aetna, MD
  • Average snowfall in December: 2.09"

The month with the highest snowfall is January (4.72").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Mount Aetna, MD

Average snowfall days in December - Mount Aetna, MD
  • Average snowfall days in December: 4.5 days

The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Mount Aetna, MD

Average daylight in December / Average sunshine in December - Mount Aetna, MD
  • Average daylight in December: 9h and 2min

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 24min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in December
Mount Aetna, MD

Average sunshine days in December - Mount Aetna, MD
  • Average sunshine days in December: 16.4 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is April (11 days).

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Average UV index in December
Mount Aetna, MD

Average UV index in December - Mount Aetna, 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).

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Average cloud cover in December
Mount Aetna, MD

Average cloud cover in December - Mount Aetna, MD
  • Average cloud cover in December: 49

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 32).

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Average visibility in December
Mount Aetna, MD

Average visibility in December - Mount Aetna, MD
  • Average visibility in December: 5mi

The months with the highest visibility are April, June, July, August and November (6mi).
The months with the lowest visibility are January, February, March, May, September, October and December (5mi).

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Mount Aetna, Maryland, USA

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