December weather forecast
Fort Collins, CO

A scenic residential estate in Fort Collins, Colorado
A scenic residential estate in Fort Collins, Colorado

Weather in December

December, the first month of the winter in Fort Collins, is still a cold month, with temperature in the range of an average low of 18.7°F (-7.4°C) and an average high of 36.1°F (2.3°C).

Temperature

December is the coldest month, with an average high-temperature of 36.1°F (2.3°C) and an average low-temperature of 18.7°F (-7.4°C).

Humidity

The average relative humidity in December is 65%.

Rainfall

In Fort Collins, Colorado, during December, the rain falls for 1.5 days and regularly aggregates up to 0.16" (4mm) of precipitation. Throughout the year, there are 73.4 rainfall days, and 7.64" (194mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Fort Collins, during December, snow falls for 3.2 days and regularly aggregates up to 1.3" (33mm) of snow. Throughout the year, there are 21.2 snowfall days, and 15.98" (406mm) of snow is accumulated.

Daylight

With an average of 9h and 20min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:34 pm. On the last day of December, in Fort Collins, sunrise is at 7:23 am and sunset at 4:43 pm MST.

Sunshine

The average sunshine in December is 6.9h.

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 of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Fort Collins?

The coldest month in Fort Collins, Colorado, is December, with an average high-temperature of 36.1°F (2.3°C) and an average low-temperature of 18.7°F (-7.4°C).

What is the temperature in December in Fort Collins?

In Fort Collins, in December, the average high-temperature is 36.1°F (2.3°C), and the average low-temperature is 18.7°F (-7.4°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines relative humidity and air temperature, in August is computed to be 82.4°F (28°C).

What is the average humidity in December in Fort Collins?

In December, the average relative humidity in Fort Collins is 65%.

How much does it rain in Fort Collins in December?

In December, the rain falls for 1.5 days. Throughout December, 0.16" (4mm) of precipitation is accumulated.

How much does it snow in Fort Collins in December?

In Fort Collins, during December, snow falls for 3.2 days and regularly aggregates up to 1.3" (33mm) of snow.

What is the month with the shortest days in Fort Collins?

The month with the shortest days is December, with an average of 9h and 20min of daylight.

How many hours of daylight does Fort Collins have in December?

The average day length in December in Fort Collins is 9h and 20min.

When are sunrise and sunset in December in Fort Collins?

On the first day of December in Fort Collins, sunrise is at 7:04 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:43 pm MST.

How many hours of sunshine does Fort Collins have in December?

In December, the average sunshine duration is 6.9h.

When is the lowest UV index in Fort Collins?

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

How high is the UV index in December in Fort Collins?

In Fort Collins, Colorado, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability 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
Fort Collins, CO

Average temperature in December - Fort Collins, CO
  • Average high temperature in December: 36.1°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (36.1°F).

  • Average low temperature in December: 18.7°F

The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is December (18.7°F).

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Average pressure in December
Fort Collins, CO

Average pressure in December - Fort Collins, CO
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in December
Fort Collins, CO

Average wind speed in December - Fort Collins, CO
  • Average wind speed in December: 6.6mph

The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in December
Fort Collins, CO

Average humidity in December - Fort Collins, CO
  • Average humidity in December: 65%

The month with the highest relative humidity is February (67%).
The months with the lowest relative humidity are June, August and September (45%).

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Average rainfall in December
Fort Collins, CO

Average rainfall in December - Fort Collins, CO
  • Average rainfall in December: 0.16"

The wettest month (with the highest rainfall) is May (1.5").
The driest month (with the least rainfall) is January (0.12").

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Average rainfall days in December
Fort Collins, CO

Average rainfall days in December - Fort Collins, CO
  • Average rainfall days in December: 1.5 days

The month with the highest number of rainy days is July (14.6 days).
The month with the least rainy days is January (1.2 days).

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Average snowfall in December
Fort Collins, CO

Average snowfall in December - Fort Collins, CO
  • Average snowfall in December: 1.3"

The month with the highest snowfall is April (3.27").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Fort Collins, CO

Average snowfall days in December - Fort Collins, CO
  • Average snowfall days in December: 3.2 days

The month with the highest number of snowfall days is February (4.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Fort Collins, CO

Average daylight in December / Average sunshine in December - Fort Collins, CO
  • Average daylight in December: 9h and 20min

The month with the longest days is June (Average daylight: 15h and 2min).
The month with the shortest days is December (Average daylight: 9h and 20min).

  • Average sunshine in December: 6h and 54min

The month with the most sunshine is June (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).

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Average sunshine days in December
Fort Collins, CO

Average sunshine days in December - Fort Collins, CO
  • Average sunshine days in December: 27.5 days

The months with the most sunshine days are January and December (27.5 days).
The month with the least sunshine days is July (14.9 days).

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Average UV index in December
Fort Collins, CO

Average UV index in December - Fort Collins, CO
  • Average UV index in December: 2

The month with the highest UV index is July (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
Fort Collins, CO

Average cloud cover in December - Fort Collins, CO
  • Average cloud cover in December: 24

The months with the most cloud cover are February, April and May (Cloud cover 27).
The month with the least cloud cover is September (Cloud cover 16).

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Average visibility in December
Fort Collins, CO

Average visibility in December - Fort Collins, 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).

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