December weather forecast
Timber Lake, SD

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Weather in December

December marks the full force of the winter season in Timber Lake, painting the town white with snow. The winter chill becomes a constant, limiting outdoor activity and encouraging cozy indoor gatherings instead. With temperatures dropping from 14.4°F (-9.8°C) to 25.7°F (-3.5°C), the streets are blanketed in a fresh layer of snow. Come December, the city turns into a frosty paradise, offering ample opportunities to engage in winter sports. The month brings Timber Lake's weather full circle, ending the year on a wintry, yet festive note.

Temperature

December's arrival witnesses a distinct temperature drop, receding from November's cold 41.5°F (5.3°C) to a subzero cold 25.7°F (-3.5°C). Throughout December, the temperature tends to fall to a consistent average low of 14.4°F (-9.8°C).

Humidity

The average relative humidity in December in Timber Lake is 83%.

Rainfall

In Timber Lake, during December, the rain falls for 2.7 days and regularly aggregates up to 0.67" (17mm) of precipitation. Throughout the year, there are 89.4 rainfall days, and 15.39" (391mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Timber Lake. In December, it is snowing for 9.5 days. Throughout December, 3.39" (86mm) of snow is accumulated. In Timber Lake, during the entire year, snow falls for 49.4 days and aggregates up to 19.09" (485mm) 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 7:04 am and sunset at 4:02 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:11 pm MST.

Sunshine

The average sunshine in December is 4.5h.

UV index

The months with the lowest UV index in Timber Lake are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The average daily UV index of 1 in December transforms into the following instructions:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
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Frequently asked questions

How cold is it in Timber Lake in December?

December temperatures vary between a high-temperature of 25.7°F (-3.5°C) and a low-temperature of 14.4°F (-9.8°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, in August is calculated to be 86°F (30°C).

What is the average humidity in December in Timber Lake?

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

How many days does it rain in December in Timber Lake?

In Timber Lake, South Dakota, in December, during 2.7 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.

How much does it snow in Timber Lake in December?

In Timber Lake, during December, snow falls for 9.5 days and regularly aggregates up to 3.39" (86mm) of snow.

What is the month with the shortest days in Timber Lake?

December has the shortest days of the year in Timber Lake, with an average of 8h and 48min of daylight.

What is the average length of the day in December in Timber Lake?

The average day length in December in Timber Lake is 8h and 47min.

When is the sunrise / sunset in December in Timber Lake?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 4:02 pm. On the last day of the month, in Timber Lake, South Dakota, sunrise is at 7:23 am and sunset at 4:11 pm MST.

How long on average sun shines in December in Timber Lake?

The average sunshine duration in December in Timber Lake, South Dakota, is 4.5h.

What is the month with the lowest UV index in Timber Lake?

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

What is the UV index reading in December in Timber Lake?

In Timber Lake, the average daily maximum UV index in December is 1. 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
Timber Lake, SD

Average temperature in December - Timber Lake, SD
  • Average high temperature in December: 25.7°F

The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (23°F).

  • Average low temperature in December: 14.4°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (9°F).

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Average pressure in December
Timber Lake, SD

Average pressure in December - Timber Lake, 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 (29.84"Hg).

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Average wind speed in December
Timber Lake, SD

Average wind speed in December - Timber Lake, SD
  • Average wind speed in December: 9.9mph

The windiest month (with the highest average wind speed) is April (11.5mph).
The calmest month (with the lowest average wind speed) is February (9.4mph).

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Average humidity in December
Timber Lake, SD

Average humidity in December - Timber Lake, SD
  • Average humidity in December: 83%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (52%).

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Average rainfall in December
Timber Lake, SD

Average rainfall in December - Timber Lake, SD
  • Average rainfall in December: 0.67"

The wettest month (with the highest rainfall) is June (2.32").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in December
Timber Lake, SD

Average rainfall days in December - Timber Lake, SD
  • Average rainfall days in December: 2.7 days

The month with the highest number of rainy days is June (13.8 days).
The month with the least rainy days is February (1.3 days).

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Average snowfall in December
Timber Lake, SD

Average snowfall in December - Timber Lake, SD
  • Average snowfall in December: 3.39"

The month with the highest snowfall is February (3.98").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Timber Lake, SD

Average snowfall days in December - Timber Lake, SD
  • Average snowfall days in December: 9.5 days

The month with the highest number of snowfall days is January (11.8 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
Timber Lake, SD

Average daylight in December / Average sunshine in December - Timber Lake, SD
  • 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: 4h and 3min

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

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Average sunshine days in December
Timber Lake, SD

Average sunshine days in December - Timber Lake, SD
  • Average sunshine days in December: 20.1 days

The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is June (13.6 days).

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Average UV index in December
Timber Lake, SD

Average UV index in December - Timber Lake, SD
  • Average UV index in December: 1

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

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Average cloud cover in December
Timber Lake, SD

Average cloud cover in December - Timber Lake, SD
  • Average cloud cover in December: 52

The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are July and August (Cloud cover 21).

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Average visibility in December
Timber Lake, SD

Average visibility in December - Timber Lake, SD
  • Average visibility in December: 6mi

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

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Timber Lake, South Dakota, USA

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