December weather forecast
Littleton, CO

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The hilly slopes on the South Platte River during the fall, large rocks, and stones in the river below
The hilly slopes on the South Platte River during the fall, large rocks, and stones in the river below

Weather in December

Winter is in full swing in Littleton, Colorado, during December, marked by the year's coldest temperature of 41°F (5°C). The month is punctuated by reduced daylight hours, settling at around 9.4 hours per day. This, coupled with a modest 0.51" (13mm) of rainfall, creates an overall austere climatic condition. The palpable chill in the air and a probable 4.06" (103mm) of snowfall over 7 days signifies the true onset of Colorado's wintertime. Despite the icy conditions, the holidays bring a warmth of their own to the otherwise frosty city.

Temperature

December is the coldest month in Littleton, with an average high-temperature of 41°F (5°C) and an average low-temperature of 21°F (-6.1°C).

Humidity

The average relative humidity in December in Littleton is 60%.

Rainfall

In December, in Littleton, Colorado, the rain falls for 4.4 days. Throughout December, 0.51" (13mm) of precipitation is accumulated. In Littleton, during the entire year, the rain falls for 101.2 days and collects up to 11.89" (302mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Littleton. In December, in Littleton, it is snowing for 7 days. Throughout December, 4.06" (103mm) of snow is accumulated. In Littleton, during the entire year, snow falls for 42.7 days and aggregates up to 34.92" (887mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:02 am and sunset at 4:36 pm. On the last day of December, in Littleton, sunrise is at 7:20 am and sunset at 4:46 pm MST.

Sunshine

In December, the average sunshine in Littleton is 7h.

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 the ordinary person.
Note: An average UV index of 2 in December transforms into this advice:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.

Frequently asked questions

What time of the year is the coldest in Littleton?

With its average high temperature of 41°F (5°C) and a low of 21°F (-6.1°C), December is regarded as the coldest month.

How cold is December in Littleton?

December temperatures vary between a high-temperature of 41°F (5°C) and a low-temperature of 21°F (-6.1°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in August is calculated to be 84.2°F (29°C).

What is the average humidity in December in Littleton?

In Littleton, the average relative humidity in December is 60%.

How many days does it rain in December in Littleton?

In December, in Littleton, the rain falls for 4.4 days. Throughout December, 0.51" (13mm) of precipitation is accumulated.

How many days does it snow in December in Littleton?

In December, in Littleton, it is snowing for 7 days. Throughout December, 4.06" (103mm) of snow is accumulated.

What is the month with the shortest days in Littleton?

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

How many hours of daylight does Littleton have in December?

In December, the average day length in Littleton, Colorado, is 9h and 25min.

When is the sunrise / sunset in December in Littleton?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:36 pm. On the last day of the month, in Littleton, Colorado, sunrise is at 7:20 am and sunset at 4:46 pm MST.

How long on average sun shines in December in Littleton?

In December, the average sunshine duration in Littleton is 7h.

What is the month with the lowest UV index in Littleton?

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 intensity in December in Littleton?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability 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
Littleton, CO

Average temperature in December - Littleton, CO
  • Average high temperature in December: 41°F

The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is December (41°F).

  • Average low temperature in December: 21°F

The month with the highest average low temperature is July (59.7°F).
The coldest month (with the lowest average low temperature) is December (21°F).

Average pressure in December
Littleton, CO

Average pressure in December - Littleton, CO
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is April (29.91"Hg).

Average wind speed in December
Littleton, CO

Average wind speed in December - Littleton, CO
  • Average wind speed in December: 6.1mph

The windiest month (with the highest average wind speed) is April (7mph).
The calmest month (with the lowest average wind speed) is September (6mph).

Average humidity in December
Littleton, CO

Average humidity in December - Littleton, CO
  • Average humidity in December: 60%

The month with the highest relative humidity is February (65%).
The months with the lowest relative humidity are June and August (41%).

Average rainfall in December
Littleton, CO

Average rainfall in December - Littleton, CO
  • Average rainfall in December: 0.51"

The wettest month (with the highest rainfall) is May (2.05").
The driest month (with the least rainfall) is January (0.43").

Average rainfall days in December
Littleton, CO

Average rainfall days in December - Littleton, CO
  • Average rainfall days in December: 4.4 days

The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is January (3 days).

Average snowfall in December
Littleton, CO

Average snowfall in December - Littleton, CO
  • Average snowfall in December: 4.06"

The month with the highest snowfall is February (6.3").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Littleton, CO

Average snowfall days in December - Littleton, CO
  • Average snowfall days in December: 7 days

The month with the highest number of snowfall days is February (9.2 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Littleton, CO
  • Average daylight in December: 9h and 2min

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 24min).

  • Average sunshine in December: 7h and 0min

The months with the most sunshine are June, July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 48min).

Average sunshine days in December
Littleton, CO

Average sunshine days in December - Littleton, CO
  • Average sunshine days in December: 22.3 days

The month with the most sunshine days is November (23.5 days).
The month with the least sunshine days is July (10 days).

Average UV index in December
Littleton, CO

Average UV index in December - Littleton, CO
  • Average UV index in December: 2

The months with the highest UV index are 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
Littleton, CO

Average cloud cover in December - Littleton, CO
  • Average cloud cover in December: 21

The month with the most cloud cover is April (Cloud cover 26).
The month with the least cloud cover is September (Cloud cover 14).

Average visibility in December
Littleton, CO

Average visibility in December - Littleton, CO
  • 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).

Littleton, Colorado, USA

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