December weather forecast
Twin Falls, ID

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The high water of the Shoshone Falls in Twin Falls, Idaho, falling over the high rock cliffs and flowing into a river below
The high water of the Shoshone Falls in Twin Falls, Idaho, falling over the high rock cliffs and flowing into a river below

Weather in December

December marks the peak of winter in Twin Falls, with severe cold and the heaviest snowfall of 4.53" (115mm). The city becomes a quiet, snow-dusted landscape as people retreat indoors to celebrate the holiday season. Compared to November, the chilly conditions intensify making way for the coldest month of the year. Amid the biting cold, the city meticulously decorates itself for the festive season, making for a stunning winter wonderland. Despite the harsh weather, the spirit of the season and the imminent New Year instill a sense of joy and warmth in Twin Falls.

Temperature

December is Twin Falls's coldest month, registering average high temperatures of 34°F (1.1°C) and lows of 23°F (-5°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

The month with the most rainfall is December, when the rain falls for 7.5 days and typically aggregates up to 1.3" (33mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. In Twin Falls, in December, during 9.4 snowfall days, 4.53" (115mm) of snow is typically accumulated. Throughout the year, in Twin Falls, there are 35.5 snowfall days, and 17.32" (440mm) of snow is accumulated.

Daylight

With an average of 9h and 6min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:48 am and sunset at 5:05 pm. On the last day of the month, sunrise is at 8:07 am and sunset at 5:14 pm MST.

Sunshine

With an average of 5.8h of sunshine, December has the least sunshine of the year.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for average individuals.
Note: In December, the maximum UV index of 2 suggests this advice:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. To guard against the harmful effects of the Sun, minimize exposure during midday. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
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Frequently asked questions

What part of the year is the coldest in Twin Falls?

Twin Falls's coldest month, December, registers temperatures that range from a high of 34°F (1.1°C) to a low of 23°F (-5°C).

How cold is December in Twin Falls?

The high-temperature, in December, in Twin Falls, records 34°F (1.1°C), while the low-temperature is 23°F (-5°C).

What is the average humidity in December in Twin Falls?

The average relative humidity in December in Twin Falls, Idaho, is 77%.

What is the rainiest month in Twin Falls?

The month with the most rainfall in Twin Falls is December, when the rain falls for 7.5 days and typically aggregates up to 1.3" (33mm) of precipitation.

How much does it rain in Twin Falls in December?

In Twin Falls, Idaho, in December, during 7.5 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

How much does it snow in Twin Falls in December?

In Twin Falls, Idaho, during December, snow falls for 9.4 days and regularly aggregates up to 4.53" (115mm) of snow.

What is the month with the shortest days in Twin Falls?

With an average of 9h and 6min of daylight, December has the shortest days of the year in Twin Falls.

What is the average length of the day in December in Twin Falls?

In Twin Falls, Idaho, the average day length in December is 9h and 7min.

When is the sunrise / sunset in December in Twin Falls?

On the first day of December in Twin Falls, sunrise is at 7:48 am and sunset at 5:05 pm. On the last day of the month, sunrise is at 8:07 am and sunset at 5:14 pm MST.

What is the month with the least sunshine in Twin Falls?

December has the least sunshine of the year in Twin Falls, with an average of 5.8h of sunshine.

How many hours of sunshine does Twin Falls have in December?

In December, the average sunshine duration is 5.8h.

When is the lowest UV index in Twin Falls?

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

What is the UV index reading in December in Twin Falls?

The average daily maximum UV index in December in Twin Falls, Idaho, is 2. A UV Index of 2, and less, symbolizes 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
Twin Falls, ID

Average temperature in December - Twin Falls, ID
  • Average high temperature in December: 34°F

The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is December (34°F).

  • Average low temperature in December: 23°F

The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is December (23°F).

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Average pressure in December
Twin Falls, ID

Average pressure in December - Twin Falls, ID
  • Average pressure in December: 30.23"Hg

The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in December
Twin Falls, ID

Average wind speed in December - Twin Falls, ID
  • Average wind speed in December: 7.7mph

The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).

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Average humidity in December
Twin Falls, ID

Average humidity in December - Twin Falls, ID
  • Average humidity in December: 77%

The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is July (28%).

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Average rainfall in December
Twin Falls, ID

Average rainfall in December - Twin Falls, ID
  • Average rainfall in December: 1.3"

The wettest month (with the highest rainfall) is December (1.3").
The driest months (with the least rainfall) are July and August (0.24").

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Average rainfall days in December
Twin Falls, ID

Average rainfall days in December - Twin Falls, ID
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is March (12.1 days).
The month with the least rainy days is August (4.4 days).

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Average snowfall in December
Twin Falls, ID

Average snowfall in December - Twin Falls, ID
  • Average snowfall in December: 4.53"

The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Twin Falls, ID

Average snowfall days in December - Twin Falls, ID
  • Average snowfall days in December: 9.4 days

The month with the highest number of snowfall days is December (9.4 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
Twin Falls, ID

Average daylight in December / Average sunshine in December - Twin Falls, ID
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 5h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in December
Twin Falls, ID

Average sunshine days in December - Twin Falls, ID
  • Average sunshine days in December: 17.2 days

The month with the most sunshine days is August (23.3 days).
The month with the least sunshine days is March (14.7 days).

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Average UV index in December
Twin Falls, ID

Average UV index in December - Twin Falls, ID
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 7).
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
Twin Falls, ID

Average cloud cover in December - Twin Falls, ID
  • Average cloud cover in December: 40

The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are July and August (Cloud cover 10).

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Average visibility in December
Twin Falls, ID

Average visibility in December - Twin Falls, ID
  • 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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Twin Falls, Idaho, USA

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