December weather forecast and climate
Louisville, CO

Weather in December

December, the first month of the winter, in Louisville, is also a wintry month, with average temperature ranging between max 39.4°F (4.1°C) and min 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 December, the average relative humidity in Louisville is 62%.

Rainfall

In December, the rain falls for 5 days. Throughout December, 0.2" (5mm) of precipitation is accumulated. Throughout the year, in Louisville, there are 96.7 rainfall days, and 5.63" (143mm) of precipitation is accumulated.

Snowfall

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

Daylight

With an average of 9.4h of daylight, December has the shortest days of the year in Louisville.

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 vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 2 interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always 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 Louisville?

December is the coldest month, 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).

What is the average humidity in December in Louisville?

The average relative humidity in December in Louisville is 62%.

How much does it rain in Louisville in December?

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

How much does it snow in Louisville in December?

In December, in Louisville, Colorado, it is snowing for 5.6 days. Throughout December, 1.34" (34mm) of snow is accumulated.

What is the month with the shortest days in Louisville?

December has the shortest days of the year, with an average of 9.4h of daylight.

How many hours of daylight does Louisville have in December?

In December, the average length of the day in Louisville is 9.4h.

How long on average sun shines in December in Louisville?

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

What is the month 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, Colorado.

What is the UV index intensity in December in Louisville?

The average daily maximum UV index in December in Louisville, Colorado, is 2. A UV Index value of 2, and less, symbolizes a low health threat from unprotected exposure to the UV radiation.

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"

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

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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").
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).
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: 9.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in December: 7h

Months with the most sunshine are June, July and August (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 6.7h).

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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

Months with the highest UV index are July and August (UV index 6).
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

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

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

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