December weather forecast
Boise, ID

The golden fall season in Boise, Idaho
The golden fall season in Boise, Idaho

Weather in December

The first month of the winter, December, is still a cold month in Boise, Idaho, with an average temperature varying between 34.7°F (1.5°C) and 23.2°F (-4.9°C).

Temperature

With an average high-temperature of 34.7°F (1.5°C) and an average low-temperature of 23.2°F (-4.9°C), December is the coldest month.

Humidity

In December, the average relative humidity is 78%.

Rainfall

In Boise, Idaho, during December, the rain falls for 10.4 days and regularly aggregates up to 2.09" (53mm) of precipitation. Throughout the year, there are 116.8 rainfall days, and 15.08" (383mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. December is the month with the most snowfall in Boise. Snow falls for 9.2 days and accumulates 6.65" (169mm) of snow.

Daylight

December has the shortest days of the year in Boise, with an average of 9h and 0min of daylight.
On the first day of the month, sunrise is at 7:58 am and sunset at 5:09 pm. On the last day of December, sunrise is at 8:18 am and sunset at 5:17 pm MST.

Sunshine

With an average of 5.5h 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 minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged 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 coldest month in Boise?

With an average high-temperature of 34.7°F (1.5°C) and an average low-temperature of 23.2°F (-4.9°C), December is the coldest month.

What is the average humidity in December in Boise?

In December, the average relative humidity in Boise, Idaho, is 78%.

How much does it rain in Boise in December?

In Boise, in December, it is raining for 10.4 days, with typically 2.09" (53mm) of accumulated precipitation.

What is the snowiest month in Boise?

December is the month with the most snowfall in Boise, Idaho. Snow falls for 9.2 days and accumulates 6.65" (169mm) of snow.

How much does it snow in Boise in December?

In December, in Boise, it is snowing for 9.2 days. Throughout December, 6.65" (169mm) of snow is accumulated.

What is the month with the shortest days in Boise?

December has the shortest days of the year, with an average of 9h and 0min of daylight.

How many hours of daylight does Boise have in December?

In Boise, Idaho, the average day length in December is 9h and 0min.

What time are sunrise and sunset in December in Boise?

On the first day of December in Boise, Idaho, sunrise is at 7:58 am and sunset at 5:09 pm. On the last day of the month, sunrise is at 8:18 am and sunset at 5:17 pm MST.

What is the month with the least sunshine in Boise?

The month with the least sunshine in Boise is December, with an average of 5.5h of sunshine.

How long on average sun shines in December in Boise?

The average sunshine duration in December in Boise, Idaho, is 5.5h.

What is the month with the lowest UV index in Boise?

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

What is the UV index reading in December in Boise?

In December, the average daily maximum UV index in Boise is 2. A UV Index value of 2, and less, symbolizes 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
Boise, ID

Average temperature in December - Boise, ID
  • Average high temperature in December: 34.7°F

The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is December (34.7°F).

  • Average low temperature in December: 23.2°F

The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.2°F).

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Average pressure in December
Boise, ID

Average pressure in December - Boise, ID
  • Average pressure in December: 30.22"Hg

The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in December
Boise, ID

Average wind speed in December - Boise, ID
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (5.2mph).

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Average humidity in December
Boise, ID

Average humidity in December - Boise, ID
  • Average humidity in December: 78%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (30%).

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Average rainfall in December
Boise, ID

Average rainfall in December - Boise, ID
  • Average rainfall in December: 2.09"

The wettest month (with the highest rainfall) is March (2.2").
The driest month (with the least rainfall) is July (0.2").

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Average rainfall days in December
Boise, ID

Average rainfall days in December - Boise, ID
  • Average rainfall days in December: 10.4 days

The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is July (4.5 days).

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Average snowfall in December
Boise, ID

Average snowfall in December - Boise, ID
  • Average snowfall in December: 6.65"

The month with the highest snowfall is December (6.65").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Boise, ID

Average snowfall days in December - Boise, ID
  • Average snowfall days in December: 9.2 days

The month with the highest number of snowfall days is December (9.2 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
Boise, ID

Average daylight in December / Average sunshine in December - Boise, ID
  • Average daylight in December: 9h and 0min

The month with the longest days is June (Average daylight: 15h and 23min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in December: 5h and 30min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

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Average sunshine days in December
Boise, ID

Average sunshine days in December - Boise, ID
  • Average sunshine days in December: 15.2 days

The month with the most sunshine days is July (23.6 days).
The month with the least sunshine days is March (12.1 days).

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Average UV index in December
Boise, ID

Average UV index in December - Boise, 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
Boise, ID

Average cloud cover in December - Boise, ID
  • Average cloud cover in December: 42

The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 8).

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Average visibility in December
Boise, ID

Average visibility in December - Boise, ID
  • 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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