December weather forecast and climate
Greeley, CO

Weather in December

December, the first month of the winter, in Greeley, is also a wintry month, with average temperature fluctuating between 20.1°F (-6.6°C) and 38.3°F (3.5°C).

Temperature

With an average high-temperature of 38.3°F (3.5°C) and an average low-temperature of 20.1°F (-6.6°C), December is the coldest month.

Humidity

Months with the highest humidity in Greeley, Colorado, are January and December, with an average relative humidity of 64%.

Rainfall

December is the month with the least rainfall in Greeley. Rain falls for 1.7 days and accumulates 0.2" (5mm) of precipitation.

Snowfall

Months with snowfall in Greeley are January through May, October through December. In Greeley, Colorado, during December, snow falls for 4.5 days and regularly aggregates up to 1.18" (30mm) of snow. Throughout the year, there are 26.6 snowfall days, and 13.62" (346mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9.3h of daylight.

Sunshine

February and December, with an average of 6.6h of sunshine, are months with the least sunshine.

UV index

Months with the lowest UV index in Greeley 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 unprotected 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 Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 Greeley?

The coldest month is December, with an average high-temperature of 38.3°F (3.5°C) and an average low-temperature of 20.1°F (-6.6°C).

What is the temperature in December in Greeley?

In Greeley, Colorado, in December, the average high-temperature is 38.3°F (3.5°C), and the average low-temperature is 20.1°F (-6.6°C).

What are the most humid months in Greeley?

Months with the highest humidity in Greeley, Colorado, are January and December, with an average relative humidity of 64%.

What is the average humidity in December in Greeley?

In Greeley, Colorado, the average relative humidity in December is 64%.

How much does it rain in Greeley in December?

In Greeley, in December, it is raining for 1.7 days, with typically 0.2" (5mm) of accumulated precipitation.

What is the driest month in Greeley?

The month with the least rainfall is December when the rain falls for 1.7 days and typically collects 0.2" (5mm) of precipitation.

How much does it snow in Greeley in December?

In December, in Greeley, it is snowing for 4.5 days. Throughout December, 1.18" (30mm) of snow is accumulated.

What is the month with the shortest days in Greeley?

With an average of 9.3h of daylight, December has the shortest days of the year in Greeley, Colorado.

How many hours of daylight does Greeley have in December?

In Greeley, the average length of the day in December is 9.3h.

What is the month with the least sunshine in Greeley?

February and December, with an average of 6.6h of sunshine, are months with the least sunshine in Greeley, Colorado.

How long on average sun shines in December in Greeley?

In Greeley, the average sunshine in December is 6.6h.

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

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

How high is the UV index in December in Greeley?

In Greeley, Colorado, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV rays.

Average temperature in December
Greeley, CO

Average temperature in December - Greeley, CO
  • Average high temperature in December: 38.3°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is December (38.3°F).

  • Average low temperature in December: 20.1°F

The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is December (20.1°F).

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Average pressure in December
Greeley, CO

Average pressure in December - Greeley, CO
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in December
Greeley, CO

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

The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is December (6mph).

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Average humidity in December
Greeley, CO

Average humidity in December - Greeley, CO
  • Average humidity in December: 64%

Months with the highest relative humidity are January and December (64%).
Months with the lowest relative humidity are August and September (44%).

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Average rainfall in December
Greeley, CO

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

The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is December (0.2").

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Average rainfall days in December
Greeley, CO

Average rainfall days in December - Greeley, CO
  • Average rainfall days in December: 1.7 days

The month with the highest number of rainy days is July (11.4 days).
The month with the least rainy days is November (1.6 days).

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Average snowfall in December
Greeley, CO

Average snowfall in December - Greeley, CO
  • Average snowfall in December: 1.18"

The month with the highest snowfall is February (2.36").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Greeley, CO

Average snowfall days in December - Greeley, CO
  • Average snowfall days in December: 4.5 days

The month with the highest number of snowfall days is February (5.7 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
Greeley, CO

Average daylight in December / Average sunshine in December - Greeley, CO
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 6.6h

The month with the most sunshine is June (Average sunshine: 11.9h).
Months with the least sunshine are February and December (Average sunshine: 6.6).

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Average sunshine days in December
Greeley, CO

Average sunshine days in December - Greeley, CO
  • Average sunshine days in December: 25.9 days

The month with the most sunshine days is December (25.9 days).
The month with the least sunshine days is July (16.7 days).

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Average UV index in December
Greeley, CO

Average UV index in December - Greeley, 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
Greeley, CO

Average cloud cover in December - Greeley, CO
  • Average cloud cover in December: 27

The month with the most cloud cover is February (Cloud cover 29).
The month with the least cloud cover is June (Cloud cover 16).

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Average visibility in December
Greeley, CO

Average visibility in December - Greeley, 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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