December weather forecast
Belle Fourche, SD

Weather in December

December, the first month of the winter in Belle Fourche, is still a freezing cold month, with an average temperature fluctuating between 18.1°F (-7.7°C) and 30.4°F (-0.9°C).

Temperature

December is the coldest month, with an average high-temperature of 30.4°F (-0.9°C) and an average low-temperature of 18.1°F (-7.7°C).

Humidity

In Belle Fourche, South Dakota, the average relative humidity in December is 78%.

Rainfall

In December, in Belle Fourche, South Dakota, the rain falls for 3.5 days. Throughout December, 0.59" (15mm) of precipitation is accumulated. Throughout the year, there are 100 rainfall days, and 12.83" (326mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Belle Fourche are January through May, September through December. In Belle Fourche, during December, snow falls for 9.4 days and regularly aggregates up to 2.95" (75mm) of snow. Throughout the year, there are 52.1 snowfall days, and 23.54" (598mm) of snow is accumulated.

Daylight

With an average of 8h and 53min of daylight, December has the shortest days of the year in Belle Fourche.
On the first day of December, sunrise is at 7:12 am and sunset at 4:16 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:24 pm MST.

Sunshine

In Belle Fourche, the average sunshine in December is 5.8h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Belle Fourche. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 2 in December transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Belle Fourche?

December is the coldest month, with an average high-temperature of 30.4°F (-0.9°C) and an average low-temperature of 18.1°F (-7.7°C).

What is the average humidity in December in Belle Fourche?

In Belle Fourche, South Dakota, the average relative humidity in December is 78%.

How much does it rain in Belle Fourche in December?

In Belle Fourche, South Dakota, in December, it is raining for 3.5 days, with typically 0.59" (15mm) of accumulated precipitation.

How much does it snow in Belle Fourche in December?

In December, it is snowing for 9.4 days. Throughout December, 2.95" (75mm) of snow is accumulated.

What is the month with the shortest days in Belle Fourche?

With an average of 8h and 53min of daylight, December has the shortest days of the year in Belle Fourche, South Dakota.

What is the average length of the day in December in Belle Fourche?

In December, the average day length in Belle Fourche, South Dakota, is 8h and 53min.

When are sunrise and sunset in December in Belle Fourche?

In December, on the first day of the month, sunrise is at 7:12 am and sunset at 4:16 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:24 pm MST.

How many hours of sunshine does Belle Fourche have in December?

In December, the average sunshine duration in Belle Fourche, South Dakota, is 5.8h.

When is the lowest UV index in Belle Fourche?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Belle Fourche?

In December, the average daily maximum UV index in Belle Fourche, South Dakota, is 2. A UV Index reading of 2, and below, represents 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
Belle Fourche, SD

Average temperature in December - Belle Fourche, SD
  • Average high temperature in December: 30.4°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (30.4°F).

  • Average low temperature in December: 18.1°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).

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Average pressure in December
Belle Fourche, SD

Average pressure in December - Belle Fourche, SD
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in December
Belle Fourche, SD

Average wind speed in December - Belle Fourche, SD
  • Average wind speed in December: 10.1mph

The windiest months (with the highest average wind speed) are January and October (10.4mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).

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Average humidity in December
Belle Fourche, SD

Average humidity in December - Belle Fourche, SD
  • Average humidity in December: 78%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (47%).

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Average rainfall in December
Belle Fourche, SD

Average rainfall in December - Belle Fourche, SD
  • Average rainfall in December: 0.59"

The wettest month (with the highest rainfall) is May (2.05").
The driest month (with the least rainfall) is January (0.43").

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Average rainfall days in December
Belle Fourche, SD

Average rainfall days in December - Belle Fourche, SD
  • Average rainfall days in December: 3.5 days

The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is January (2.8 days).

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Average snowfall in December
Belle Fourche, SD

Average snowfall in December - Belle Fourche, SD
  • Average snowfall in December: 2.95"

The month with the highest snowfall is April (4.88").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Belle Fourche, SD

Average snowfall days in December - Belle Fourche, SD
  • Average snowfall days in December: 9.4 days

The month with the highest number of snowfall days is February (10.3 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
Belle Fourche, SD

Average daylight in December / Average sunshine in December - Belle Fourche, SD
  • Average daylight in December: 8h and 53min

The month with the longest days is June (Average daylight: 15h and 31min).
The month with the shortest days is December (Average daylight: 8h and 53min).

  • Average sunshine in December: 5h and 48min

The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).

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Average sunshine days in December
Belle Fourche, SD

Average sunshine days in December - Belle Fourche, SD
  • Average sunshine days in December: 19.5 days

The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is April (12.6 days).

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Average UV index in December
Belle Fourche, SD

Average UV index in December - Belle Fourche, SD
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Belle Fourche, SD

Average cloud cover in December - Belle Fourche, SD
  • Average cloud cover in December: 40

The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in December
Belle Fourche, SD

Average visibility in December - Belle Fourche, SD
  • 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).

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