December weather forecast
Aspen, CO

Share
The icy Maroon Bells in the Elk Mountains viewed from the White River below
The icy Maroon Bells in the Elk Mountains viewed from the White River below

Weather in December

In December, Aspen is fully engrossed in winter with shorter days and colder temperatures. Ski season is in full swing as 2.32" (59mm) of snow dresses the landscape in a blanket of pure white. It's the heart of winter, with the city's maximum temperature barely exceeding the freezing point. Despite the gloomy cloud cover, the decoration of twinkling holiday lights creates a winter wonderland. However foggy and chilly, Aspen's beauty remains unrivaled amid a flurry of snowflakes.

Temperature

January and December in Aspen are characterised by lowest temperatures, with an average high of 24.4°F (-4.2°C).

Humidity

In December, the average relative humidity is 86%.

Rainfall

In Aspen, during December, the rain falls for 5.2 days and regularly aggregates up to 0.28" (7mm) of precipitation. In Aspen, during the entire year, the rain falls for 72.4 days and collects up to 4.33" (110mm) of precipitation.

Snowfall

Months with snowfall in Aspen, Colorado, are January through June, September through December. In Aspen, during December, snow falls for 11.8 days and regularly aggregates up to 2.32" (59mm) of snow. In Aspen, during the entire year, snow falls for 83.2 days and aggregates up to 19.45" (494mm) of snow.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:08 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:54 pm MST.

Sunshine

In Aspen, the average sunshine in December is 5.5h.

UV index

The months with the lowest UV index in Aspen are February and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 1 in December transforms into the following instructions:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
[Resources]

Frequently asked questions

What is the coldest time of year in Aspen?

Aspen's temperatures tend to hit their minimum during January and December, with an average high-temperature of 24.4°F (-4.2°C).

How cold is December in Aspen?

In December, in Aspen, the average high-temperature is 24.4°F (-4.2°C), and the average low-temperature is 3.6°F (-15.8°C).

What is the average humidity in December in Aspen?

The average relative humidity in December in Aspen, Colorado, is 86%.

How much does it rain in Aspen in December?

In Aspen, Colorado, in December, it is raining for 5.2 days, with typically 0.28" (7mm) of accumulated precipitation.

How many days does it snow in December in Aspen?

In Aspen, Colorado, in December, during 11.8 snowfall days, 2.32" (59mm) of snow is typically accumulated.

What is the month with the shortest days in Aspen?

With an average of 9h and 30min of daylight, December has the shortest days of the year in Aspen.

How many hours of daylight does Aspen have in December?

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

When is the sunrise / sunset in December in Aspen?

On the first day of December in Aspen, Colorado, sunrise is at 7:08 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:54 pm MST.

How many hours of sunshine does Aspen have in December?

In December, the average sunshine duration in Aspen is 5.5h.

What are the months with the lowest UV index in Aspen?

The months with the lowest UV index in Aspen are February and December, with an average maximum UV index of 1.

What is the UV index intensity in December in Aspen?

The average daily maximum UV index in December in Aspen is 1. A UV Index value of 2, and less, symbolizes a low health threat 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
Aspen, CO

Average temperature in December - Aspen, CO
  • Average high temperature in December: 24.4°F

The warmest month (with the highest average high temperature) is July (69.4°F).
The months with the lowest average high temperature are January and December (24.4°F).

  • Average low temperature in December: 3.6°F

The month with the highest average low temperature is July (40.5°F).
The coldest month (with the lowest average low temperature) is January (2.1°F).

[Resources]

Average pressure in December
Aspen, CO

Average pressure in December - Aspen, CO
  • Average pressure in December: 30.17"Hg

The month with the highest atmospheric pressure is January (30.23"Hg).
The months with the lowest atmospheric pressure are April and May (29.95"Hg).

[Resources]

Average wind speed in December
Aspen, CO

Average wind speed in December - Aspen, CO
  • Average wind speed in December: 4.7mph

The windiest month (with the highest average wind speed) is June (6.2mph).
The calmest months (with the lowest average wind speed) are January and August (4.5mph).

[Resources]

Average humidity in December
Aspen, CO

Average humidity in December - Aspen, CO
  • Average humidity in December: 86%

The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is June (51%).

[Resources]

Average rainfall in December
Aspen, CO

Average rainfall in December - Aspen, CO
  • Average rainfall in December: 0.28"

The wettest months (with the highest rainfall) are March and July (0.51").
The driest month (with the least rainfall) is September (0.2").

[Resources]

Average rainfall days in December
Aspen, CO

Average rainfall days in December - Aspen, CO
  • Average rainfall days in December: 5.2 days

The month with the highest number of rainy days is July (12.1 days).
The month with the least rainy days is January (2.8 days).

[Resources]

Average snowfall in December
Aspen, CO

Average snowfall in December - Aspen, CO
  • Average snowfall in December: 2.32"

The month with the highest snowfall is March (3.98").
The months with the least snowfall are July and August (0").

[Resources]

Average snowfall days in December
Aspen, CO

Average snowfall days in December - Aspen, CO
  • Average snowfall days in December: 11.8 days

The month with the highest number of snowfall days is February (12.8 days).
The months with the least snowfall days are July and August (0.1 days).

[Resources]

Average daylight in December /
Average sunshine in December
Aspen, CO

Average daylight in December / Average sunshine in December - Aspen, CO
  • 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 3min

The month with the most sunshine is June (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).

[Resources]

Average sunshine days in December
Aspen, CO

Average sunshine days in December - Aspen, CO
  • Average sunshine days in December: 20.9 days

The month with the most sunshine days is November (23.6 days).
The month with the least sunshine days is July (9.8 days).

[Resources]

Average UV index in December
Aspen, CO

Average UV index in December - Aspen, CO
  • Average UV index in December: 1

The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are February and December (UV index 1).

[Resources]

Average cloud cover in December
Aspen, CO

Average cloud cover in December - Aspen, CO
  • Average cloud cover in December: 46

The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is June (Cloud cover 15).

[Resources]

Average visibility in December
Aspen, CO

Average visibility in December - Aspen, CO
  • Average visibility in December: 4mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).

[Resources]

Aspen, Colorado, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location