December weather forecast
Columbia, PA

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Weather in December

December, the first month of the winter in Columbia, is still a cold month, with an average temperature varying between 41.9°F (5.5°C) and 30°F (-1.1°C).

Temperature

December involves a decrease in temperature, down from a fresh 51.1°F (10.6°C) in November to a wintry 41.9°F (5.5°C). December is noted for a mean low-temperature of 30°F (-1.1°C).

Humidity

In Columbia, the average relative humidity in December is 79%.

Rainfall

In Columbia, during December, the rain falls for 9.3 days and regularly aggregates up to 1.14" (29mm) of precipitation. Throughout the year, there are 130.2 rainfall days, and 16.22" (412mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Columbia, in December, snow falls for 3 days, with typically accumulated 0.71" (18mm) of snow. Throughout the year, there are 18.9 snowfall days, and 6.1" (155mm) 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 the month, sunrise is at 7:09 am and sunset at 4:41 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:50 pm EST.

Sunshine

In December, the average sunshine is 4.8h.

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 estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A daily high UV index of 2 in December leads to these guidelines:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. 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. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.

Frequently asked questions

How cold is it in Columbia in December?

In Columbia, in December, the average high-temperature is 41.9°F (5.5°C), and the average low-temperature is 30°F (-1.1°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, in August is estimated at 86°F (30°C).

What is the average humidity in December?

In December, the average relative humidity is 79%.

How much does it rain in December?

In Columbia, in December, during 9.3 rainfall days, 1.14" (29mm) of precipitation is typically accumulated.

How much does it snow in December?

In Columbia, in December, during 3 snowfall days, 0.71" (18mm) of snow is typically accumulated.

What is the month with the shortest days in Columbia?

With an average of 9h and 24min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

In Columbia, the average day length in December is 9h and 23min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:09 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:50 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 4.8h.

What is the month with the lowest UV index?

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

What is the UV index reading in December?

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe 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
Columbia, PA

Average temperature in December - Columbia, PA
  • Average high temperature in December: 41.9°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (35.4°F).

  • Average low temperature in December: 30°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).

Average pressure in December
Columbia, PA

Average pressure in December - Columbia, PA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Columbia, PA

Average wind speed in December - Columbia, PA
  • Average wind speed in December: 8.3mph

The windiest months (with the highest average wind speed) are February and March (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in December
Columbia, PA

Average humidity in December - Columbia, PA
  • Average humidity in December: 79%

The month with the highest relative humidity is May (81%).
The months with the lowest relative humidity are March and April (76%).

Average rainfall in December
Columbia, PA

Average rainfall in December - Columbia, PA
  • Average rainfall in December: 1.14"

The wettest month (with the highest rainfall) is August (1.89").
The driest month (with the least rainfall) is January (0.98").

Average rainfall days in December
Columbia, PA

Average rainfall days in December - Columbia, PA
  • Average rainfall days in December: 9.3 days

The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (5.8 days).

Average snowfall in December
Columbia, PA

Average snowfall in December - Columbia, PA
  • Average snowfall in December: 0.71"

The month with the highest snowfall is January (1.89").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Columbia, PA

Average snowfall days in December - Columbia, PA
  • Average snowfall days in December: 3 days

The month with the highest number of snowfall days is January (6.5 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Columbia, PA
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
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 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in December
Columbia, PA

Average sunshine days in December - Columbia, PA
  • Average sunshine days in December: 18.5 days

The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is May (13.2 days).

Average UV index in December
Columbia, PA

Average UV index in December - Columbia, PA
  • Average UV index in December: 2

The months with the highest UV index are May, June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Columbia, PA

Average cloud cover in December - Columbia, PA
  • 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).

Average visibility in December
Columbia, PA

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

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

Columbia, Pennsylvania, USA

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