December weather forecast
Columbia, MD

A beautiful and scenic setting around the waterfront homes at Wilde Lake in Columbia, Maryland
A beautiful and scenic setting around the waterfront homes at Wilde Lake in Columbia, Maryland

Weather in December

December, the first month of the winter in Columbia, is also a frosty month, with temperature in the range of an average low of 32.9°F (0.5°C) and an average high of 44.2°F (6.8°C).

Temperature

In December, the average high-temperature slightly decreases from a fresh 53.1°F (11.7°C) in November to a frosty 44.2°F (6.8°C). The average low-temperature, is 32.9°F (0.5°C).

Humidity

In December, the average relative humidity is 76%.

Rainfall

In Columbia, in December, during 10.2 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. In Columbia, during the entire year, the rain falls for 159.3 days and collects up to 30.31" (770mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall. In Columbia, during 2.9 snowfall days, 1.14" (29mm) of snow is typically accumulated. In Columbia, Maryland, during the entire year, snow falls for 15.9 days and aggregates up to 8.7" (221mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 28min of daylight.
On the first day of December, sunrise is at 7:07 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:54 pm EST.

Sunshine

In December, the average sunshine is 5.2h.

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 exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 2 in December transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Columbia?

In Columbia, Maryland, the average relative humidity in December is 76%.

How many days does it rain in December in Columbia?

In Columbia, Maryland, during December, the rain falls for 10.2 days and regularly aggregates up to 2.24" (57mm) of precipitation.

How many days does it snow in December in Columbia?

In Columbia, during December, snow falls for 2.9 days and regularly aggregates up to 1.14" (29mm) of snow.

What is the month with the shortest days in Columbia?

December has the shortest days of the year in Columbia, with an average of 9h and 28min of daylight.

How many hours of daylight does Columbia have in December?

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

When is the sunrise / sunset in December in Columbia?

On the first day of December in Columbia, Maryland, sunrise is at 7:07 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:54 pm EST.

How long on average sun shines in December in Columbia?

In December, the average sunshine duration in Columbia, Maryland, is 5.2h.

When is the lowest UV index in Columbia?

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

How high is the UV index in December in Columbia?

In Columbia, 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
Columbia, MD

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

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (38.1°F).

  • Average low temperature in December: 32.9°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

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Average pressure in December
Columbia, MD

Average pressure in December - Columbia, 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 (29.94"Hg).

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Average wind speed in December
Columbia, MD

Average wind speed in December - Columbia, MD
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

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Average humidity in December
Columbia, MD

Average humidity in December - Columbia, MD
  • Average humidity in December: 76%

The months with the highest relative humidity are May and October (77%).
The months with the lowest relative humidity are April and July (72%).

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Average rainfall in December
Columbia, MD

Average rainfall in December - Columbia, MD
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is August (4.06").
The driest month (with the least rainfall) is January (1.85").

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Average rainfall days in December
Columbia, MD

Average rainfall days in December - Columbia, MD
  • Average rainfall days in December: 10.2 days

The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (8.4 days).

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Average snowfall in December
Columbia, MD

Average snowfall in December - Columbia, MD
  • Average snowfall in December: 1.14"

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

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Average snowfall days in December
Columbia, MD

Average snowfall days in December - Columbia, MD
  • Average snowfall days in December: 2.9 days

The month with the highest number of snowfall days is February (4.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Columbia, MD

Average daylight in December / Average sunshine in December - Columbia, MD
  • Average daylight in December: 9h and 28min

The month with the longest days is June (Average daylight: 14h and 53min).
The month with the shortest days is December (Average daylight: 9h and 28min).

  • Average sunshine in December: 5h and 12min

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 6min).

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Average sunshine days in December
Columbia, MD

Average sunshine days in December - Columbia, MD
  • Average sunshine days in December: 17.9 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (11 days).

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Average UV index in December
Columbia, MD

Average UV index in December - Columbia, 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
Columbia, MD

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

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).

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Average visibility in December
Columbia, MD

Average visibility in December - Columbia, MD
  • Average visibility in December: 6mi

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

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