December weather forecast
Jackson, MT

Share

Weather in December

December, the first month of the winter in Jackson, is still a freezing cold month, with an average temperature ranging between min 9.5°F (-12.5°C) and max 25.2°F (-3.8°C).

Temperature

With average temperatures fluctuating between a high of 25.2°F (-3.8°C) and a low of 9.5°F (-12.5°C), December stands out as the coldest month.

Humidity

The average relative humidity in December is 86%.

Rainfall

In Jackson, in December, during 6.8 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. In Jackson, Montana, during the entire year, the rain falls for 129.5 days and collects up to 12.4" (315mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. In Jackson, in December, during 10.4 snowfall days, 2.8" (71mm) of snow is typically accumulated. In Jackson, during the entire year, snow falls for 63.5 days and aggregates up to 22.76" (578mm) of snow.

Daylight

December has the shortest days of the year, with an average of 8h and 48min of daylight.
On the first day of December, sunrise is at 7:53 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 8:13 am and sunset at 5:00 pm MST.

Sunshine

The average sunshine in December is 5.2h.

UV index

The months with the lowest UV index are January, February and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 1 in December transforms into the following instructions:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Updated: Aug 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months?

With average high and low temperatures of 25.2°F (-3.8°C) and 9.5°F (-12.5°C) respectively, December is Jackson's coldest month.

How cold is December?

In December, the average high-temperature and low-temperature are 25.2°F (-3.8°C) and 9.5°F (-12.5°C) respectively.

What is the average humidity in December in Jackson?

In December, the average relative humidity is 86%.

How much does it rain in December?

In Jackson, in December, during 6.8 rainfall days, 0.55" (14mm) of precipitation is typically accumulated.

How many days does it snow in December in Jackson?

In Jackson, Montana, in December, during 10.4 snowfall days, 2.8" (71mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 8h and 48min of daylight.

What is the average length of the day in December?

In December, the average day length is 8h and 47min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:53 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 8:13 am and sunset at 5:00 pm MST.

How long on average sun shines in December?

In December, the average sunshine duration is 5.2h.

What are the months with the lowest UV index?

The months with the lowest UV index are January, February and December, with an average maximum UV index of 1.

What is the UV index reading in December?

The average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Jackson, MT

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location