Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The coldest period is December, when temperatures fluctuate between an average high of 27.3°F (-2.6°C) and a low of 11.8°F (-11.2°C).Humidity
The average relative humidity in December is 74%.Rainfall
In Grass Creek, in December, during 2.2 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. Throughout the year, there are 93.8 rainfall days, and 12.05" (306mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. In December, it is snowing for 6.5 days. Throughout December, 1.73" (44mm) of snow is accumulated. Throughout the year, there are 55.8 snowfall days, and 30.31" (770mm) of snow is accumulated.Daylight
With an average of 9h and 0min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:29 am and sunset at 4:37 pm. On the last day of December, in Grass Creek, sunrise is at 7:48 am and sunset at 4:46 pm MST.
Sunshine
In December, the average sunshine is 6.7h.UV index
January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.Note: In December, an average UV index of 2 transforms into the following instructions:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December in Grass Creek?
What is the month with the shortest days?
How many hours of daylight does Grass Creek have in December?
When are sunrise and sunset in December in Grass Creek?
How long on average sun shines in December?
What are the months with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Grass Creek, WY
- Average high temperature in December: 27.3°F
The warmest month (with the highest average high temperature) is July (76.1°F).
The month with the lowest average high temperature is December (27.3°F).
- Average low temperature in December: 11.8°F
The month with the highest average low temperature is July (53.8°F).
The coldest month (with the lowest average low temperature) is December (11.8°F).
Average pressure in December
Grass Creek, WY
- Average pressure in December: 30.18"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Grass Creek, WY
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in December
Grass Creek, WY
- Average humidity in December: 74%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is July (43%).
Average rainfall in December
Grass Creek, WY
- Average rainfall in December: 0.24"
The wettest month (with the highest rainfall) is May (2.48").
The driest month (with the least rainfall) is January (0.2").
Average rainfall days in December
Grass Creek, WY
- Average rainfall days in December: 2.2 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (1.6 days).
Average snowfall in December
Grass Creek, WY
- Average snowfall in December: 1.73"
The month with the highest snowfall is April (6.3").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Grass Creek, WY
- Average snowfall days in December: 6.5 days
The month with the highest number of snowfall days is April (9.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Grass Creek, WY
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 6h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 24min).
Average sunshine days in December
Grass Creek, WY
- Average sunshine days in December: 24.4 days
The month with the most sunshine days is January (25 days).
The month with the least sunshine days is May (10.2 days).
Average UV index in December
Grass Creek, WY
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in December
Grass Creek, WY
- Average cloud cover in December: 29
The month with the most cloud cover is April (Cloud cover 35).
The months with the least cloud cover are July and September (Cloud cover 17).
Average visibility in December
Grass Creek, WY
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Grass Creek, Wyoming, USA
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