December weather forecast
Superior, MT

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Weather in December

December, the first month of the winter in Superior, is still a freezing cold month, with an average temperature ranging between max 28.9°F (-1.7°C) and min 16.2°F (-8.8°C).

Temperature

December is Superior's coldest month, registering average high temperatures of 28.9°F (-1.7°C) and lows of 16.2°F (-8.8°C).

Humidity

The average relative humidity in December is 91%.

Rainfall

In Superior, Montana, in December, it is raining for 12.2 days, with typically 2.99" (76mm) of accumulated precipitation. Throughout the year, in Superior, there are 152.1 rainfall days, and 22.09" (561mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall in Superior. In Superior, in December, during 20.4 snowfall days, 13.35" (339mm) of snow is typically accumulated. Throughout the year, there are 90.2 snowfall days, and 58.15" (1477mm) of snow is accumulated.

Daylight

With an average of 8h and 36min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 8:06 am and sunset at 4:51 pm. On the last day of December, in Superior, Montana, sunrise is at 8:25 am and sunset at 4:59 pm MST.

Sunshine

In December, the average sunshine is 3.8h.

UV index

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Superior. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, a daily maximum UV index of 1 leads to the following instructions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. To avoid the Sun's strongest rays, limit exposure around the mid-day period. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
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Frequently asked questions

What is the coldest time of year in Superior?

The coldest month in Superior, Montana, is December, with an average high-temperature of 28.9°F (-1.7°C) and an average low-temperature of 16.2°F (-8.8°C).

How cold is it in Superior in December?

The high-temperature during December is 28.9°F (-1.7°C) and the low-temperature is 16.2°F (-8.8°C).

What is the average humidity in December in Superior?

In December, the average relative humidity in Superior, Montana, is 91%.

How many days does it rain in December in Superior?

In Superior, Montana, during December, the rain falls for 12.2 days and regularly aggregates up to 2.99" (76mm) of precipitation.

How much does it snow in Superior in December?

In Superior, Montana, in December, snow falls for 20.4 days, with typically accumulated 13.35" (339mm) of snow.

What is the month with the shortest days in Superior?

The month with the shortest days in Superior is December, with an average of 8h and 36min of daylight.

How many hours of daylight does Superior have in December?

The average day length in December in Superior is 8h and 34min.

When is the sunrise / sunset in December in Superior?

On the first day of December in Superior, Montana, sunrise is at 8:06 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 8:25 am and sunset at 4:59 pm MST.

How many hours of sunshine does Superior have in December?

The average sunshine duration in December is 3.8h.

When is the lowest UV index in Superior?

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

How high is the UV index in December in Superior?

The average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a minimal hazard to health 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
Superior, MT

Average temperature in December - Superior, MT
  • Average high temperature in December: 28.9°F

The warmest months (with the highest average high temperature) are July and August (78.8°F).
The month with the lowest average high temperature is December (28.9°F).

  • Average low temperature in December: 16.2°F

The month with the highest average low temperature is August (45.7°F).
The coldest month (with the lowest average low temperature) is December (16.2°F).

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Average pressure in December
Superior, MT

Average pressure in December - Superior, MT
  • Average pressure in December: 30.17"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
Superior, MT

Average wind speed in December - Superior, MT
  • Average wind speed in December: 4mph

The windiest month (with the highest average wind speed) is April (4.9mph).
The calmest month (with the lowest average wind speed) is December (4mph).

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Average humidity in December
Superior, MT

Average humidity in December - Superior, MT
  • Average humidity in December: 91%

The month with the highest relative humidity is January (93%).
The months with the lowest relative humidity are July and August (53%).

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Average rainfall in December
Superior, MT

Average rainfall in December - Superior, MT
  • Average rainfall in December: 2.99"

The wettest month (with the highest rainfall) is January (3.11").
The driest month (with the least rainfall) is August (0.39").

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Average rainfall days in December
Superior, MT

Average rainfall days in December - Superior, MT
  • Average rainfall days in December: 12.2 days

The month with the highest number of rainy days is March (19.9 days).
The month with the least rainy days is August (5.9 days).

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Average snowfall in December
Superior, MT

Average snowfall in December - Superior, MT
  • Average snowfall in December: 13.35"

The month with the highest snowfall is February (15.12").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Superior, MT

Average snowfall days in December - Superior, MT
  • Average snowfall days in December: 20.4 days

The month with the highest number of snowfall days is December (20.4 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Superior, MT
  • Average daylight in December: 8h and 4min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in December: 3h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

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Average sunshine days in December
Superior, MT

Average sunshine days in December - Superior, MT
  • Average sunshine days in December: 8.1 days

The months with the most sunshine days are July and August (23.3 days).
The month with the least sunshine days is March (5.8 days).

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Average UV index in December
Superior, MT

Average UV index in December - Superior, MT
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in December
Superior, MT

Average cloud cover in December - Superior, MT
  • Average cloud cover in December: 63

The month with the most cloud cover is February (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 15).

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Average visibility in December
Superior, MT

Average visibility in December - Superior, MT
  • 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 and December (3mi).

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Superior, Montana, USA

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