December weather forecast
Louisville, CO

Weather in December

The first month of the winter, December, is still a cold month in Louisville, Colorado, with an average temperature fluctuating between 39.4°F (4.1°C) and 20.7°F (-6.3°C).

Temperature

With an average high-temperature of 39.4°F (4.1°C) and an average low-temperature of 20.7°F (-6.3°C), December is the coldest month.

Humidity

In Louisville, the average relative humidity in December is 62%.

Rainfall

In Louisville, during 5 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. In Louisville, during the entire year, the rain falls for 96.7 days and collects up to 5.63" (143mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Louisville, during 5.6 snowfall days, 1.34" (34mm) of snow is typically accumulated. Throughout the year, there are 36.7 snowfall days, and 13.98" (355mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Louisville, with an average of 9h and 23min of daylight.
On the first day of the month, sunrise is at 7:03 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:44 pm MST.

Sunshine

In December, the average sunshine is 7h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Louisville. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 2 in December transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Louisville?

December is the coldest month in Louisville, Colorado, with an average high-temperature of 39.4°F (4.1°C) and an average low-temperature of 20.7°F (-6.3°C).

What is the temperature in December in Louisville?

In Louisville, in December, the average high-temperature is 39.4°F (4.1°C), and the average low-temperature is 20.7°F (-6.3°C). in August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, is appraised at 84.2°F (29°C).

What is the average humidity in December in Louisville?

The average relative humidity in December is 62%.

How many days does it rain in December in Louisville?

In Louisville, Colorado, in December, during 5 rainfall days, 0.2" (5mm) of precipitation is typically accumulated.

How much does it snow in Louisville in December?

In Louisville, Colorado, during December, snow falls for 5.6 days and regularly aggregates up to 1.34" (34mm) of snow.

What is the month with the shortest days in Louisville?

The month with the shortest days in Louisville, Colorado, is December, with an average of 9h and 23min of daylight.

How many hours of daylight does Louisville have in December?

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

What time are sunrise and sunset in December in Louisville?

On the first day of December in Louisville, Colorado, sunrise is at 7:03 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:44 pm MST.

How many hours of sunshine does Louisville have in December?

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

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

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

How high is the UV index in December in Louisville?

In December, the average daily maximum UV index in Louisville, Colorado, is 2. A UV Index reading 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
Louisville, CO

Average temperature in December - Louisville, CO
  • Average high temperature in December: 39.4°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (39.4°F).

  • Average low temperature in December: 20.7°F

The month with the highest average low temperature is July (59°F).
The coldest months (with the lowest average low temperature) are February and December (20.7°F).

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Average pressure in December
Louisville, CO

Average pressure in December - Louisville, CO
  • Average pressure in December: 30.12"Hg

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

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Average wind speed in December
Louisville, CO

Average wind speed in December - Louisville, CO
  • Average wind speed in December: 6mph

The windiest months (with the highest average wind speed) are March and April (6.5mph).
The calmest month (with the lowest average wind speed) is September (5.6mph).

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Average humidity in December
Louisville, CO

Average humidity in December - Louisville, CO
  • Average humidity in December: 62%

The month with the highest relative humidity is February (67%).
The month with the lowest relative humidity is August (41%).

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Average rainfall in December
Louisville, CO

Average rainfall in December - Louisville, CO
  • Average rainfall in December: 0.2"

The wettest months (with the highest rainfall) are May and July (0.87").
The driest month (with the least rainfall) is January (0.16").

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Average rainfall days in December
Louisville, CO

Average rainfall days in December - Louisville, CO
  • Average rainfall days in December: 5 days

The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is November (3.5 days).

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Average snowfall in December
Louisville, CO

Average snowfall in December - Louisville, CO
  • Average snowfall in December: 1.34"

The month with the highest snowfall is February (2.68").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Louisville, CO

Average snowfall days in December - Louisville, CO
  • Average snowfall days in December: 5.6 days

The month with the highest number of snowfall days is February (8.4 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
Louisville, CO

Average daylight in December / Average sunshine in December - Louisville, CO
  • Average daylight in December: 9h and 23min

The month with the longest days is June (Average daylight: 14h and 58min).
The month with the shortest days is December (Average daylight: 9h and 23min).

  • 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 42min).

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Average sunshine days in December
Louisville, CO

Average sunshine days in December - Louisville, CO
  • Average sunshine days in December: 22.5 days

The month with the most sunshine days is November (23.7 days).
The month with the least sunshine days is July (10 days).

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Average UV index in December
Louisville, CO

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

The months with the highest UV index are 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
Louisville, CO

Average cloud cover in December - Louisville, CO
  • Average cloud cover in December: 22

The months with the most cloud cover are April and May (Cloud cover 26).
The month with the least cloud cover is September (Cloud cover 15).

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Average visibility in December
Louisville, CO

Average visibility in December - Louisville, 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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