December weather forecast
Green River, WY

Weather in December

December, the first month of the winter in Green River, is still a freezing cold month, with an average temperature ranging between max 25.7°F (-3.5°C) and min 11.5°F (-11.4°C).

Temperature

December is the coldest month, with an average high-temperature of 25.7°F (-3.5°C) and an average low-temperature of 11.5°F (-11.4°C).

Humidity

In December, the average relative humidity in Green River is 82%.

Rainfall

In December, the rain falls for 4.7 days. Throughout December, 0.71" (18mm) of precipitation is accumulated. Throughout the year, in Green River, there are 93.5 rainfall days, and 10.31" (262mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through June, September through December. In Green River, in December, snow falls for 13.5 days, with typically accumulated 4.37" (111mm) of snow. Throughout the year, in Green River, there are 75.5 snowfall days, and 30.16" (766mm) of snow is accumulated.

Daylight

With an average of 9h and 14min of daylight, December has the shortest days of the year in Green River.
On the first day of the month, sunrise is at 7:25 am and sunset at 4:48 pm. On the last day of December, sunrise is at 7:44 am and sunset at 4:57 pm MST.

Sunshine

January and December, with an average of 5.9h of sunshine, are months with the least sunshine in Green River.

UV index

The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to 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. 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.
[Resources]

FAQ

What is the coldest month in Green River?

December is the coldest month in Green River, Wyoming, with an average high-temperature of 25.7°F (-3.5°C) and an average low-temperature of 11.5°F (-11.4°C).

What is the average humidity in December in Green River?

In Green River, the average relative humidity in December is 82%.

How much does it rain in Green River in December?

In December, in Green River, the rain falls for 4.7 days. Throughout December, 0.71" (18mm) of precipitation is accumulated.

How much does it snow in Green River in December?

In Green River, Wyoming, during December, snow falls for 13.5 days and regularly aggregates up to 4.37" (111mm) of snow.

What is the month with the shortest days in Green River?

December has the shortest days of the year in Green River, Wyoming, with an average of 9h and 14min of daylight.

What is the average length of the day in December in Green River?

In Green River, Wyoming, the average day length in December is 9h and 14min.

When is the sunrise / sunset in December in Green River?

In December, on the first day of the month, sunrise is at 7:25 am and sunset at 4:48 pm. On the last day of the month, in Green River, Wyoming, sunrise is at 7:44 am and sunset at 4:57 pm MST.

What is the month with the least sunshine in Green River?

The months with the least sunshine in Green River are January and December, with an average of 5.9h of sunshine.

How many hours of sunshine does Green River have in December?

In Green River, the average sunshine duration in December is 5.9h.

When is the lowest UV index in Green River?

January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Green River.

What is the UV index intensity in December in Green River?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk 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
Green River, WY

Average temperature in December - Green River, WY
  • Average high temperature in December: 25.7°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is December (25.7°F).

  • Average low temperature in December: 11.5°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).

[Resources]

Average pressure in December
Green River, WY

Average pressure in December - Green River, WY
  • Average pressure in December: 30.24"Hg

The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

[Resources]

Average wind speed in December
Green River, WY

Average wind speed in December - Green River, WY
  • Average wind speed in December: 9.3mph

The windiest month (with the highest average wind speed) is April (12.2mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).

[Resources]

Average humidity in December
Green River, WY

Average humidity in December - Green River, WY
  • Average humidity in December: 82%

The month with the highest relative humidity is January (84%).
The months with the lowest relative humidity are July and August (31%).

[Resources]

Average rainfall in December
Green River, WY

Average rainfall in December - Green River, WY
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is May (1.5").
The driest month (with the least rainfall) is July (0.47").

[Resources]

Average rainfall days in December
Green River, WY

Average rainfall days in December - Green River, WY
  • Average rainfall days in December: 4.7 days

The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is December (4.7 days).

[Resources]

Average snowfall in December
Green River, WY

Average snowfall in December - Green River, WY
  • Average snowfall in December: 4.37"

The month with the highest snowfall is March (6.14").
The months with the least snowfall are July and August (0").

[Resources]

Average snowfall days in December
Green River, WY

Average snowfall days in December - Green River, WY
  • Average snowfall days in December: 13.5 days

The month with the highest number of snowfall days is December (13.5 days).
The months with the least snowfall days are July and August (0 days).

[Resources]

Average daylight in December /
Average sunshine in December
Green River, WY

Average daylight in December / Average sunshine in December - Green River, WY
  • Average daylight in December: 9h and 14min

The month with the longest days is June (Average daylight: 15h and 8min).
The month with the shortest days is December (Average daylight: 9h and 14min).

  • Average sunshine in December: 5h and 54min

The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The months with the least sunshine are January and December (Average sunshine: 5h and 54min).

[Resources]

Average sunshine days in December
Green River, WY

Average sunshine days in December - Green River, WY
  • Average sunshine days in December: 16.4 days

The month with the most sunshine days is September (19.8 days).
The month with the least sunshine days is April (11.5 days).

[Resources]

Average UV index in December
Green River, WY

Average UV index in December - Green River, WY
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

[Resources]

Average cloud cover in December
Green River, WY

Average cloud cover in December - Green River, WY
  • Average cloud cover in December: 41

The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 13).

[Resources]

Average visibility in December
Green River, WY

Average visibility in December - Green River, WY
  • Average visibility in December: 5mi

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

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location