December weather forecast and climate
Westminster, CO

Weather in December

The first month of the winter, December, is still a cold month in Westminster, Colorado, with temperature in the range of an average low of 21.2°F (-6°C) and an average high of 41.2°F (5.1°C).

Temperature

With an average high-temperature of 41.2°F (5.1°C) and an average low-temperature of 21.2°F (-6°C), December is the coldest month.

Humidity

In Westminster, the average relative humidity is 60%.

Rainfall

Months with the least rainfall in Westminster, Colorado, are January and December Rain falls for 4.4 days and accumulates 0.35" (9mm) of rain.

Snowfall

January through May, October through December are months with snowfall. In December, in Westminster, it is snowing for 5.6 days. Throughout December, 2.87" (73mm) of snow is accumulated. In Westminster, during the entire year, snow falls for 40.4 days, and aggregates up to 31.3" (795mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9.4h of daylight.

Sunshine

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

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
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 solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Westminster?

With an average high-temperature of 41.2°F (5.1°C) and an average low-temperature of 21.2°F (-6°C), December is the coldest month.

What is the average humidity in December in Westminster?

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

What is the driest month in Westminster?

Months with the least rainfall in Westminster are January and December Rain falls for 4.4 days and accumulates 0.35" (9mm) of rain.

How much does it rain in Westminster in December?

In Westminster, Colorado, in December, during 4.4 rainfall days, 0.35" (9mm) of precipitation is typically accumulated.

How much does it snow in Westminster in December?

In Westminster, during December, snow falls for 5.6 days and regularly aggregates up to 2.87" (73mm) of snow.

What is the month with the shortest days in Westminster?

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

How many hours of daylight does Westminster have in December?

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

How many hours of sunshine does Westminster have in December?

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

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

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

What is the UV index intensity in December in Westminster?

In Westminster, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the UV radiation.

Average temperature in December
Westminster, CO

Average temperature in December - Westminster, CO
  • Average high temperature in December: 41.2°F

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is December (41.2°F).

  • Average low temperature in December: 21.2°F

The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is December (21.2°F).

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Average pressure in December
Westminster, CO

Average pressure in December - Westminster, 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
Westminster, CO

Average wind speed in December - Westminster, CO
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is April (6.7mph).
The calmest months (with the lowest average wind speed) are August, September and December (5.8mph).

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Average humidity in December
Westminster, CO

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

The month with the highest relative humidity is February (65%).
Months with the lowest relative humidity are June and August (40%).

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Average rainfall in December
Westminster, CO

Average rainfall in December - Westminster, CO
  • Average rainfall in December: 0.35"

The wettest month (with the highest rainfall) is May (2.05").
The driest months (with the least rainfall) are January and December (0.35").

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Average rainfall days in December
Westminster, CO

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

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is January (3.3 days).

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Average snowfall in December
Westminster, CO

Average snowfall in December - Westminster, CO
  • Average snowfall in December: 2.87"

The month with the highest snowfall is April (5.55").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Westminster, CO

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

The month with the highest number of snowfall days is February (9.4 days).
Months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Westminster, 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 and July (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
Westminster, CO

Average sunshine days in December - Westminster, CO
  • Average sunshine days in December: 23.9 days

The month with the most sunshine days is December (23.9 days).
The month with the least sunshine days is July (8.8 days).

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Average UV index in December
Westminster, CO

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

Months with the highest UV index are June, 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
Westminster, CO

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

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

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Average visibility in December
Westminster, CO

Average visibility in December - Westminster, 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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