December weather forecast
Seneca Upland, MD

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Weather in December

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

Temperature

Seneca Upland observes a small decrease in the average high-temperature with the arrival of December, falling from November's cool 52.3°F (11.3°C) to a chilly 43.5°F (6.4°C). Throughout December, Seneca Upland's nights cool down to an average of 31.1°F (-0.5°C).

Humidity

In Seneca Upland, Maryland, the average relative humidity in December is 78%.

Rainfall

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

Snowfall

Months with snowfall are January through May, October through December. In Seneca Upland, during December, snow falls for 3.5 days and regularly aggregates up to 2.01" (51mm) of snow. Throughout the year, there are 21.3 snowfall days, and 13.31" (338mm) 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 the month, sunrise is at 7:09 am and sunset at 4:46 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 low health risk from exposure to the Sun's UV rays for the average person.
Note: In December, the maximum UV index of 2 suggests this advice:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. To cut down UV radiation exposure by about half, sport a wide-brim hat. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Updated: Aug 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

The average high-temperature, in December, in Seneca Upland, is 43.5°F (6.4°C), while the average low-temperature is 31.1°F (-0.5°C). The average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, in August is appraised at 89.6°F (32°C).

What is the average humidity in December?

The average relative humidity in December is 78%.

How many days does it rain in December?

In Seneca Upland, 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 Seneca Upland, in December, during 3.5 snowfall days, 2.01" (51mm) 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 in Seneca Upland.

How many hours of daylight does Seneca Upland have in December?

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

When is the sunrise / sunset in December in Seneca Upland?

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 7:28 am and sunset at 4:55 pm EST.

How long on average sun shines in December in Seneca Upland?

In Seneca Upland, the average sunshine duration in December is 5.1h.

What is the month with 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.

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Seneca Upland, MD

Average temperature in December - Seneca Upland, 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 Upland, MD

Average pressure in December - Seneca Upland, 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 Upland, MD

Average wind speed in December - Seneca Upland, 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 Upland, MD

Average humidity in December - Seneca Upland, 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 Upland, MD

Average rainfall in December - Seneca Upland, 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 Upland, MD

Average rainfall days in December - Seneca Upland, 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 Upland, MD

Average snowfall in December - Seneca Upland, 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 Upland, MD

Average snowfall days in December - Seneca Upland, 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 Upland, MD

Average daylight in December / Average sunshine in December - Seneca Upland, 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 Upland, MD

Average sunshine days in December - Seneca Upland, 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 Upland, MD

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

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

Average visibility in December - Seneca Upland, 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 Upland, Maryland, USA

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