December weather forecast
Letcher, SD

Weather in December

The first month of the winter, December, is also a subzero cold month in Letcher, South Dakota, with an average temperature varying between 16°F (-8.9°C) and 28.6°F (-1.9°C).

Temperature

In Letcher, the average high-temperature in December declines considerably from a frosty 45°F (7.2°C) in November to a freezing cold 28.6°F (-1.9°C). In December, in Letcher, the average low-temperature is 16°F (-8.9°C).

Humidity

In Letcher, the average relative humidity in December is 83%.

Rainfall

In December, the rain falls for 2.9 days. Throughout December, 0.51" (13mm) of precipitation is accumulated. Throughout the year, in Letcher, there are 93.2 rainfall days, and 11.3" (287mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall in Letcher. In Letcher, in December, snow falls for 7.5 days, with typically accumulated 1.1" (28mm) of snow. Throughout the year, in Letcher, there are 35.3 snowfall days, and 7.17" (182mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Letcher, with an average of 8h and 58min of daylight.
On the first day of December, sunrise is at 7:46 am and sunset at 4:56 pm. On the last day of the month, sunrise is at 8:06 am and sunset at 5:04 pm CST.

Sunshine

The average sunshine in December is 4.7h.

UV index

In Letcher, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the average 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Letcher?

In Letcher, in December, the average high-temperature is 28.6°F (-1.9°C), and the average low-temperature is 16°F (-8.9°C). in August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is computed to be 89.6°F (32°C).

What is the average humidity in December in Letcher?

The average relative humidity in December in Letcher is 83%.

How many days does it rain in December in Letcher?

In December, the rain falls for 2.9 days. Throughout December, 0.51" (13mm) of precipitation is accumulated.

How much does it snow in Letcher in December?

In Letcher, in December, snow falls for 7.5 days, with typically accumulated 1.1" (28mm) of snow.

What is the month with the shortest days in Letcher?

The month with the shortest days in Letcher, South Dakota, is December, with an average of 8h and 58min of daylight.

How many hours of daylight does Letcher have in December?

In December, the average day length is 8h and 58min.

When is the sunrise / sunset in December in Letcher?

In December, on the first day of the month, sunrise is at 7:46 am and sunset at 4:56 pm. On the last day of the month, in Letcher, sunrise is at 8:06 am and sunset at 5:04 pm CST.

How long on average sun shines in December in Letcher?

In Letcher, the average sunshine duration in December is 4.7h.

What is the UV index reading in December in Letcher?

The average daily maximum UV index in December in Letcher is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to 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
Letcher, SD

Average temperature in December - Letcher, SD
  • Average high temperature in December: 28.6°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (24.4°F).

  • Average low temperature in December: 16°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (10.2°F).

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Average pressure in December
Letcher, SD

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

The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

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Average wind speed in December
Letcher, SD

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

The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (8.6mph).

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Average humidity in December
Letcher, SD

Average humidity in December - Letcher, SD
  • Average humidity in December: 83%

The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are September and October (63%).

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Average rainfall in December
Letcher, SD

Average rainfall in December - Letcher, SD
  • Average rainfall in December: 0.51"

The wettest month (with the highest rainfall) is May (1.65").
The driest months (with the least rainfall) are February and November (0.28").

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Average rainfall days in December
Letcher, SD

Average rainfall days in December - Letcher, SD
  • Average rainfall days in December: 2.9 days

The month with the highest number of rainy days is June (13.6 days).
The month with the least rainy days is February (1.9 days).

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Average snowfall in December
Letcher, SD

Average snowfall in December - Letcher, SD
  • Average snowfall in December: 1.1"

The month with the highest snowfall is February (1.42").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Letcher, SD

Average snowfall days in December - Letcher, SD
  • Average snowfall days in December: 7.5 days

The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Letcher, SD

Average daylight in December / Average sunshine in December - Letcher, SD
  • Average daylight in December: 8h and 58min

The month with the longest days is June (Average daylight: 15h and 25min).
The month with the shortest days is December (Average daylight: 8h and 58min).

  • Average sunshine in December: 4h and 42min

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

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Average sunshine days in December
Letcher, SD

Average sunshine days in December - Letcher, SD
  • Average sunshine days in December: 21.9 days

The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is June (12.8 days).

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Average UV index in December
Letcher, SD

Average UV index in December - Letcher, SD
  • Average UV index in December: 2

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

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Average cloud cover in December
Letcher, SD

Average cloud cover in December - Letcher, SD
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 22).

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Average visibility in December
Letcher, SD

Average visibility in December - Letcher, 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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