December weather forecastBanner, WY
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Banner, Wyoming, with an average temperature fluctuating between 15.3°F (-9.3°C) and 29.3°F (-1.5°C).Temperature
December weather is marked by a drop in the average high-temperature, falling from an icy 39.7°F (4.3°C) in November to a subzero cold 29.3°F (-1.5°C). During the month of December, Banner's nighttime temperature lowers to an average of 15.3°F (-9.3°C).Humidity
The average relative humidity in December is 73%.Rainfall
December is the month with the least rainfall. Rain falls for 7.8 days and accumulates 0.75" (19mm) of precipitation.Snowfall
Months with snowfall in Banner are January through May, September through December. In December, it is snowing for 13.6 days. Throughout December, 4.41" (112mm) of snow is accumulated. In Banner, during the entire year, snow falls for 78.9 days and aggregates up to 46.3" (1176mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 54min of daylight.On the first day of the month, sunrise is at 7:24 am and sunset at 4:28 pm. On the last day of December, sunrise is at 7:44 am and sunset at 4:37 pm MST.
Sunshine
The average sunshine in December is 6.5h.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 of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the average person.Note: In December, the UV index of 2 transforms into the following advice:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Banner, WY
- Average high temperature in December: 29.3°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is February (29.1°F).
- Average low temperature in December: 15.3°F
The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).
Average pressure in December
Banner, WY
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Banner, WY
- Average wind speed in December: 6.6mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in December
Banner, WY
- Average humidity in December: 73%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (46%).
Average rainfall in December
Banner, WY
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is May (3.43").
The driest month (with the least rainfall) is December (0.75").
Average rainfall days in December
Banner, WY
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is May (22.3 days).
The month with the least rainy days is November (7.5 days).
Average snowfall in December
Banner, WY
- Average snowfall in December: 4.41"
The month with the highest snowfall is April (8.7").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Banner, WY
- Average snowfall days in December: 13.6 days
The month with the highest number of snowfall days is February (15.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Banner, WY
- Average daylight in December: 8h and 54min
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: 6h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 6min).
Average sunshine days in December
Banner, WY
- Average sunshine days in December: 14.2 days
The month with the most sunshine days is November (15.2 days).
The month with the least sunshine days is May (5.8 days).
Average UV index in December
Banner, 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).
Average cloud cover in December
Banner, WY
- Average cloud cover in December: 33
The months with the most cloud cover are February and April (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 15).
Average visibility in December
Banner, 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).
