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
December is the coldest month in Greybull, with the temperature often reaching an average high of 28.8°F (-1.8°C) and an average low of 14.2°F (-9.9°C).Humidity
In December, the average relative humidity is 73%.Rainfall
The month with the least rainfall is December, when the rain falls for 6.5 days and typically collects 0.2" (5mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Greybull, in December, during 7.5 snowfall days, 1.3" (33mm) of snow is typically accumulated. Throughout the year, there are 41.4 snowfall days, and 9.41" (239mm) of snow is accumulated.Daylight
With an average of 8h and 54min of daylight, December has the shortest days of the year in Greybull.On the first day of December in Greybull, sunrise is at 7:29 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:48 am and sunset at 4:42 pm MST.
Sunshine
The average sunshine in December in Greybull, Wyoming, is 7h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index of 2 during December translates into these guidelines:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest in Greybull?
How cold is December in Greybull?
What is the average humidity in December in Greybull?
What is the driest month in Greybull?
How many days does it rain in December in Greybull?
How much does it snow in Greybull in December?
What is the month with the shortest days in Greybull?
What is the average length of the day in December in Greybull?
What time are sunrise and sunset in December in Greybull?
How long on average sun shines in December in Greybull?
When is the lowest UV index in Greybull?
How high is the UV index in December in Greybull?
Average temperature in December
Greybull, WY
- Average high temperature in December: 28.8°F
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is December (28.8°F).
- Average low temperature in December: 14.2°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure in December
Greybull, WY
- Average pressure in December: 30.15"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Greybull, WY
- Average wind speed in December: 6.5mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest months (with the lowest average wind speed) are January and August (6mph).
Average humidity in December
Greybull, WY
- Average humidity in December: 73%
The month with the highest relative humidity is January (78%).
The months with the lowest relative humidity are July and August (33%).
Average rainfall in December
Greybull, WY
- Average rainfall in December: 0.2"
The wettest month (with the highest rainfall) is May (0.87").
The driest month (with the least rainfall) is December (0.2").
Average rainfall days in December
Greybull, WY
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is May (12.6 days).
The month with the least rainy days is December (6.5 days).
Average snowfall in December
Greybull, WY
- Average snowfall in December: 1.3"
The month with the highest snowfall is February (2.52").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Greybull, WY
- Average snowfall days in December: 7.5 days
The month with the highest number of snowfall days is February (9.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Greybull, WY
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 7h and 0min
The months with the most sunshine are June, July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 6h and 42min).
Average sunshine days in December
Greybull, WY
- Average sunshine days in December: 20.9 days
The month with the most sunshine days is December (20.9 days).
The months with the least sunshine days are April and June (12.5 days).
Average UV index in December
Greybull, WY
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Greybull, WY
- Average cloud cover in December: 26
The month with the most cloud cover is February (Cloud cover 28).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in December
Greybull, 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).
Greybull, Wyoming, USA
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