December weather forecast
Sunburst, MT

Share

Weather in December

December, the first month of the winter in Sunburst, is still a freezing cold month, with an average temperature ranging between min 15.4°F (-9.2°C) and max 27.7°F (-2.4°C).

Temperature

The coldest period is December, when temperatures fluctuate between an average high of 27.7°F (-2.4°C) and a low of 15.4°F (-9.2°C).

Humidity

The average relative humidity in December is 77%.

Rainfall

January and December are months with the least rain when the rain falls for 3.3 days and typically aggregates up to 0.39" (10mm) of rain.

Snowfall

January through May, September through December are months with snowfall. In Sunburst, in December, snow falls for 9.5 days, with typically accumulated 2.28" (58mm) of snow. In Sunburst, during the entire year, snow falls for 53.7 days and aggregates up to 20.47" (520mm) of snow.

Daylight

The month with the shortest days is December, with an average of 8h and 18min of daylight.
On the first day of the month, sunrise is at 8:00 am and sunset at 4:33 pm. On the last day of December, sunrise is at 8:21 am and sunset at 4:40 pm MST.

Sunshine

The average sunshine in December is 5.5h.

UV index

The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the maximum UV index of 2 translates into these guidelines:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Updated: Jul 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

The month of December, characterized by an average high of 27.7°F (-2.4°C) and a low of 15.4°F (-9.2°C), is recognized as the coldest.

How cold is it in December?

December temperatures vary between a high-temperature of 27.7°F (-2.4°C) and a low-temperature of 15.4°F (-9.2°C). In July, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 80.6°F (27°C).

What is the average humidity in December?

In December, the average relative humidity is 77%.

What is the driest month?

January and December are months with the least rain in Sunburst when the rain falls for 3.3 days and typically aggregates up to 0.39" (10mm) of rain.

How many days does it rain in December?

In December, in Sunburst, the rain falls for 3.3 days. Throughout December, 0.39" (10mm) of precipitation is accumulated.

How many days does it snow in December?

In Sunburst, during December, snow falls for 9.5 days and regularly aggregates up to 2.28" (58mm) of snow.

What is the month with the shortest days?

With an average of 8h and 18min of daylight, December has the shortest days of the year.

How many hours of daylight does Sunburst have in December?

The average day length in December is 8h and 20min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 8:00 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 8:21 am and sunset at 4:40 pm MST.

How long on average sun shines in December?

The average sunshine duration in December is 5.5h.

What is the month with the lowest UV index?

The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation.
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
Sunburst, MT

Average temperature in December - Sunburst, MT
  • Average high temperature in December: 27.7°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is December (27.7°F).

  • Average low temperature in December: 15.4°F

The month with the highest average low temperature is August (58.3°F).
The coldest month (with the lowest average low temperature) is December (15.4°F).

Average pressure in December
Sunburst, MT

Average pressure in December - Sunburst, MT
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

Average wind speed in December
Sunburst, MT

Average wind speed in December - Sunburst, MT
  • Average wind speed in December: 10mph

The windiest month (with the highest average wind speed) is April (11mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).

Average humidity in December
Sunburst, MT

Average humidity in December - Sunburst, MT
  • Average humidity in December: 77%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (40%).

Average rainfall in December
Sunburst, MT

Average rainfall in December - Sunburst, MT
  • Average rainfall in December: 0.39"

The wettest month (with the highest rainfall) is June (2.01").
The driest months (with the least rainfall) are January and December (0.39").

Average rainfall days in December
Sunburst, MT

Average rainfall days in December - Sunburst, MT
  • Average rainfall days in December: 3.3 days

The month with the highest number of rainy days is May (13.9 days).
The month with the least rainy days is February (3.1 days).

Average snowfall in December
Sunburst, MT

Average snowfall in December - Sunburst, MT
  • Average snowfall in December: 2.28"

The month with the highest snowfall is February (4.17").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
Sunburst, MT

Average snowfall days in December - Sunburst, MT
  • Average snowfall days in December: 9.5 days

The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are July and August (0 days).

Average daylight in December /
Average sunshine in December
Sunburst, MT

Average daylight in December / Average sunshine in December - Sunburst, MT
  • Average daylight in December: 8h and 2min

The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).

  • Average sunshine in December: 5h and 3min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).

Average sunshine days in December
Sunburst, MT

Average sunshine days in December - Sunburst, MT
  • Average sunshine days in December: 20.8 days

The month with the most sunshine days is September (22.2 days).
The month with the least sunshine days is April (14.7 days).

Average UV index in December
Sunburst, MT

Average UV index in December - Sunburst, MT
  • 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, October, November and December (UV index 2).

Average cloud cover in December
Sunburst, MT

Average cloud cover in December - Sunburst, MT
  • Average cloud cover in December: 42

The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 15).

Average visibility in December
Sunburst, MT

Average visibility in December - Sunburst, MT
  • 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).

Sunburst, Montana, USA

Weather forecast for your location

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