December weather forecastJackson, WY
December
Weather in December
December in Jackson witnesses the return of the harsh winter. The mercury continues its descend, dancing around a chilling 5.2°F (-14.9°C) to 21.9°F (-5.6°C). Substantial snowfall of 24.72" (628mm) buries the city under a thick layer of white. The city basks under short daylight hours, with the landscape often hidden behind the cloak of snowfall. As December concludes, it leaves behind footprints of a challenging but enchantingly beautiful winter.Temperature
December, with its high-temperature average of 21.9°F (-5.6°C) and a low-temperature average of 5.2°F (-14.9°C), is the coldest month.Humidity
In Jackson, the average relative humidity in December is 92%.Rainfall
In Jackson, in December, it is raining for 4.2 days, with typically 2.91" (74mm) of accumulated precipitation. Throughout the year, there are 103 rainfall days, and 29.84" (758mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through December. In Jackson, Wyoming, during December, snow falls for 23.7 days and regularly aggregates up to 24.72" (628mm) of snow. Throughout the year, there are 173.6 snowfall days, and 181.26" (4604mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 0min of daylight.On the first day of December, sunrise is at 7:36 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:55 am and sunset at 4:56 pm MST.
Sunshine
In December, the average sunshine is 3.6h.UV index
January through April, October through December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 1 during December translates into the following guidance:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Jackson, WY
- Average high temperature in December: 21.9°F
The warmest month (with the highest average high temperature) is July (73.4°F).
The month with the lowest average high temperature is December (21.9°F).
- Average low temperature in December: 5.2°F
The month with the highest average low temperature is July (43.5°F).
The coldest month (with the lowest average low temperature) is January (4.8°F).
Average pressure in December
Jackson, WY
- Average pressure in December: 30.25"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Jackson, WY
- Average wind speed in December: 4.3mph
The windiest month (with the highest average wind speed) is June (5.7mph).
The calmest month (with the lowest average wind speed) is December (4.3mph).
Average humidity in December
Jackson, WY
- Average humidity in December: 92%
The month with the highest relative humidity is February (94%).
The month with the lowest relative humidity is August (50%).
Average rainfall in December
Jackson, WY
- Average rainfall in December: 2.91"
The wettest month (with the highest rainfall) is February (3.54").
The driest month (with the least rainfall) is August (1.34").
Average rainfall days in December
Jackson, WY
- Average rainfall days in December: 4.2 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (2.9 days).
Average snowfall in December
Jackson, WY
- Average snowfall in December: 24.72"
The month with the highest snowfall is February (29.33").
The month with the least snowfall is August (0.12").
Average snowfall days in December
Jackson, WY
- Average snowfall days in December: 23.7 days
The month with the highest number of snowfall days is March (24.8 days).
The month with the least snowfall days is July (0.4 days).
Average daylight in December /
Average sunshine in December
Jackson, 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: 3h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).
Average sunshine days in December
Jackson, WY
- Average sunshine days in December: 8 days
The month with the most sunshine days is July (15.6 days).
The month with the least sunshine days is April (3.8 days).
Average UV index in December
Jackson, WY
- Average UV index in December: 1
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).
Average cloud cover in December
Jackson, WY
- Average cloud cover in December: 66
The month with the most cloud cover is February (Cloud cover 72).
The months with the least cloud cover are July and August (Cloud cover 16).
Average visibility in December
Jackson, WY
- Average visibility in December: 3mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (3mi).
