December weather forecast
Seneca Overlook, MD

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Weather in December

December, the first month of the winter in Seneca Overlook, is also a frosty month, with temperature in the range of an average low of 31.1°F (-0.5°C) and an average high of 43.5°F (6.4°C).

Temperature

December's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a cool 52.3°F (11.3°C) in November to a chilly 43.5°F (6.4°C). Seneca Overlook reports an average low-temperature of 31.1°F (-0.5°C) during the nights of December.

Humidity

In December, the average relative humidity is 78%.

Rainfall

In Seneca Overlook, in December, it is raining for 10.4 days, with typically 2.24" (57mm) of accumulated precipitation. Throughout the year, there are 158.7 rainfall days, and 30.91" (785mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Seneca Overlook are January through May, October through December. In December, it is snowing for 3.5 days. Throughout December, 2.01" (51mm) of snow is accumulated. In Seneca Overlook, during the entire year, snow falls for 21.3 days and aggregates up to 13.31" (338mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 30min of daylight.
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 7:28 am and sunset at 4:55 pm EST.

Sunshine

In December, the average sunshine is 5.1h.

UV index

The months with the lowest UV index 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 average person.
Note: The average daily UV index of 2 in December transforms into the following instructions:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.

Frequently asked questions

Is December cold?

An average high-temperature, in December, in Seneca Overlook, is 43.5°F (6.4°C) and the average low-temperature is 31.1°F (-0.5°C). In August, the average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 89.6°F (32°C).

What is the average humidity in December?

The average relative humidity in December in Seneca Overlook is 78%.

How much does it rain in December?

In Seneca Overlook, during December, the rain falls for 10.4 days and regularly aggregates up to 2.24" (57mm) of precipitation.

How much does it snow in December?

In December, it is snowing for 3.5 days. Throughout December, 2.01" (51mm) of snow is 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 Seneca Overlook have in December?

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

What time are sunrise and 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 7:28 am and sunset at 4:55 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 5.1h.

When is the lowest UV index?

January, February, 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?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from 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
Seneca Overlook, MD

Average temperature in December - Seneca Overlook, MD
  • Average high temperature in December: 43.5°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 (37.8°F).

  • Average low temperature in December: 31.1°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

Average pressure in December
Seneca Overlook, MD

Average pressure in December - Seneca Overlook, 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
Seneca Overlook, MD

Average wind speed in December - Seneca Overlook, MD
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Seneca Overlook, MD

Average humidity in December - Seneca Overlook, MD
  • Average humidity in December: 78%

The months with the highest relative humidity are May and October (79%).
The months with the lowest relative humidity are April and July (74%).

Average rainfall in December
Seneca Overlook, MD

Average rainfall in December - Seneca Overlook, MD
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is August (3.82").
The driest month (with the least rainfall) is January (1.93").

Average rainfall days in December
Seneca Overlook, MD

Average rainfall days in December - Seneca Overlook, MD
  • Average rainfall days in December: 10.4 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in December
Seneca Overlook, MD

Average snowfall in December - Seneca Overlook, MD
  • Average snowfall in December: 2.01"

The month with the highest snowfall is March (4.09").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Seneca Overlook, MD

Average snowfall days in December - Seneca Overlook, MD
  • Average snowfall days in December: 3.5 days

The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Seneca Overlook, MD

Average daylight in December / Average sunshine in December - Seneca Overlook, 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: 4h and 54min).

Average sunshine days in December
Seneca Overlook, MD

Average sunshine days in December - Seneca Overlook, MD
  • Average sunshine days in December: 17.6 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (10.8 days).

Average UV index in December
Seneca Overlook, MD

Average UV index in December - Seneca Overlook, 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
Seneca Overlook, MD

Average cloud cover in December - Seneca Overlook, 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
Seneca Overlook, MD

Average visibility in December - Seneca Overlook, 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).

Seneca Overlook, Maryland, USA

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