December weather forecast
Greeley, IA

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Weather in December

December, the first month of the winter in Greeley, is also a subzero cold month, with an average temperature ranging between min 20.5°F (-6.4°C) and max 31.1°F (-0.5°C).

Temperature

The transition into December is accompanied by a temperature decrease, with the average high-temperature shifting from a chilly 43.7°F (6.5°C) in November to a freezing cold 31.1°F (-0.5°C). During the month of December, Greeley experiences a steady low-temperature average of 20.5°F (-6.4°C).

Humidity

The average relative humidity in December in Greeley is 83%.

Rainfall

December is the month with the least rainfall. Rain falls for 4.5 days and accumulates 0.47" (12mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Greeley, in December, during 8.8 snowfall days, 0.94" (24mm) of snow is typically accumulated. Throughout the year, there are 39.4 snowfall days, and 6.81" (173mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 7:16 am and sunset at 4:33 pm. On the last day of December, sunrise is at 7:35 am and sunset at 4:42 pm CST.

Sunshine

In Greeley, the average sunshine in December is 4h.

UV index

The months with the lowest UV index are January, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.
Note: The maximum daily UV index of 1 during December translates into the following directions:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature during December is 31.1°F (-0.5°C) and the low-temperature is 20.5°F (-6.4°C).

What is the average humidity in December?

In Greeley, the average relative humidity in December is 83%.

What is the driest month?

The month with the least rainfall is December, when the rain falls for 4.5 days and typically collects 0.47" (12mm) of precipitation.

How much does it rain in December?

In December, the rain falls for 4.5 days. Throughout December, 0.47" (12mm) of precipitation is accumulated.

How many days does it snow in December?

In Greeley, during December, snow falls for 8.8 days and regularly aggregates up to 0.94" (24mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 6min of daylight.

What is the average length of the day in December?

In Greeley, the average day length in December is 9h and 7min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:16 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:42 pm CST.

How many hours of sunshine does Greeley have in December?

In December, the average sunshine duration is 4h.

What are the months with the lowest UV index?

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Greeley.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 1. A UV Index estimate of 2, and below, represents a low health threat from unsafe 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
Greeley, IA

Average temperature in December - Greeley, IA
  • Average high temperature in December: 31.1°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (24.3°F).

  • Average low temperature in December: 20.5°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).

Average pressure in December
Greeley, IA

Average pressure in December - Greeley, IA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in December
Greeley, IA

Average wind speed in December - Greeley, IA
  • Average wind speed in December: 10.2mph

The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).

Average humidity in December
Greeley, IA

Average humidity in December - Greeley, IA
  • Average humidity in December: 83%

The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and October (75%).

Average rainfall in December
Greeley, IA

Average rainfall in December - Greeley, IA
  • Average rainfall in December: 0.47"

The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is December (0.47").

Average rainfall days in December
Greeley, IA

Average rainfall days in December - Greeley, IA
  • Average rainfall days in December: 4.5 days

The month with the highest number of rainy days is June (15.4 days).
The month with the least rainy days is February (2.6 days).

Average snowfall in December
Greeley, IA

Average snowfall in December - Greeley, IA
  • Average snowfall in December: 0.94"

The month with the highest snowfall is January (2.13").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Greeley, IA

Average snowfall days in December - Greeley, IA
  • Average snowfall days in December: 8.8 days

The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Greeley, IA

Average daylight in December / Average sunshine in December - Greeley, IA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 4h and 0min

The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days in December
Greeley, IA

Average sunshine days in December - Greeley, IA
  • Average sunshine days in December: 19.7 days

The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is June (11.7 days).

Average UV index in December
Greeley, IA

Average UV index in December - Greeley, IA
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).

Average cloud cover in December
Greeley, IA

Average cloud cover in December - Greeley, IA
  • Average cloud cover in December: 59

The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 33).

Average visibility in December
Greeley, IA

Average visibility in December - Greeley, IA
  • Average visibility in December: 6mi

The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).

Greeley, Iowa, USA

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