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, marked by an average high-temperature of 25.2°F (-3.8°C) and a low-temperature of 9.5°F (-12.5°C), is the coldest month.Humidity
In December, the average relative humidity in Jackson is 86%.Rainfall
In Jackson, in December, it is raining for 6.8 days, with typically 0.55" (14mm) of accumulated precipitation. Throughout the year, there are 129.5 rainfall days, and 12.4" (315mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. In December, in Jackson, Montana, it is snowing for 10.4 days. Throughout December, 2.8" (71mm) of snow is accumulated. Throughout the year, in Jackson, there are 63.5 snowfall days, and 22.76" (578mm) of snow is accumulated.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year in Jackson.On the first day of the month, sunrise is at 7:53 am and sunset at 4:52 pm. On the last day of December, in Jackson, sunrise is at 8:13 am and sunset at 5:00 pm MST.
Sunshine
In Jackson, the average sunshine in December is 5.2h.UV index
The months with the lowest UV index in Jackson, Montana, are January, February and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 1 in December translates into these instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Enhance your sun protection with tightly woven, yet airy clothing. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Frequently asked questions
What is the coldest month in Jackson?
How cold is it in Jackson in December?
What is the average humidity in December in Jackson?
How much does it rain in Jackson in December?
How many days does it snow in December in Jackson?
What is the month with the shortest days in Jackson?
How many hours of daylight does Jackson have in December?
When is the sunrise / sunset in December in Jackson?
How long on average sun shines in December in Jackson?
What is the month with the lowest UV index in Jackson?
What is the UV index reading in December in Jackson?
Average temperature in December
Jackson, MT
- Average high temperature in December: 25.2°F
The warmest month (with the highest average high temperature) is July (75.7°F).
The month with the lowest average high temperature is December (25.2°F).
- Average low temperature in December: 9.5°F
The month with the highest average low temperature is August (47.5°F).
The coldest months (with the lowest average low temperature) are January and December (9.5°F).
Average pressure in December
Jackson, MT
- Average pressure in December: 30.23"Hg
The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Jackson, MT
- Average wind speed in December: 4.9mph
The windiest months (with the highest average wind speed) are March and April (5.2mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in December
Jackson, MT
- Average humidity in December: 86%
The month with the highest relative humidity is February (89%).
The month with the lowest relative humidity is August (43%).
Average rainfall in December
Jackson, MT
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is June (2.05").
The driest months (with the least rainfall) are July and August (0.51").
Average rainfall days in December
Jackson, MT
- Average rainfall days in December: 6.8 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in December
Jackson, MT
- Average snowfall in December: 2.8"
The month with the highest snowfall is February (5").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Jackson, MT
- Average snowfall days in December: 10.4 days
The month with the highest number of snowfall days is February (12.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Jackson, MT
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in December
Jackson, MT
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is July (19.4 days).
The month with the least sunshine days is April (7.7 days).
Average UV index in December
Jackson, MT
- 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 and December (UV index 1).
Average cloud cover in December
Jackson, MT
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in December
Jackson, MT
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).
Jackson, Montana, USA
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