December weather forecast
Challis, ID

Weather in December

The first month of the winter, December, is also a subzero cold month in Challis, Idaho, with an average temperature varying between 8.6°F (-13°C) and 26.1°F (-3.3°C).

Temperature

The coldest month is December, with an average high-temperature of 26.1°F (-3.3°C) and an average low-temperature of 8.6°F (-13°C).

Humidity

In December, the average relative humidity in Challis is 84%.

Rainfall

In Challis, in December, during 4.6 rainfall days, 0.51" (13mm) of precipitation is typically accumulated. In Challis, during the entire year, the rain falls for 75.7 days and collects up to 6.38" (162mm) of precipitation.

Snowfall

January through June, September through December are months with snowfall in Challis. In Challis, during 10.1 snowfall days, 3.03" (77mm) of snow is typically accumulated. In Challis, during the entire year, snow falls for 51.7 days and aggregates up to 18.62" (473mm) of snow.

Daylight

December has the shortest days of the year, with an average of 8h and 54min of daylight.
On the first day of the month, sunrise is at 7:53 am and sunset at 4:58 pm. On the last day of December, in Challis, Idaho, sunrise is at 8:13 am and sunset at 5:06 pm MST.

Sunshine

In December, the average sunshine is 6h.

UV index

January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Challis. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. 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 Challis?

December is the coldest month in Challis, with an average high-temperature of 26.1°F (-3.3°C) and an average low-temperature of 8.6°F (-13°C).

What is the average humidity in December in Challis?

In December, the average relative humidity in Challis, Idaho, is 84%.

How many days does it rain in December in Challis?

In Challis, Idaho, in December, it is raining for 4.6 days, with typically 0.51" (13mm) of accumulated precipitation.

How many days does it snow in December in Challis?

In Challis, in December, snow falls for 10.1 days, with typically accumulated 3.03" (77mm) of snow.

What is the month with the shortest days in Challis?

December has the shortest days of the year in Challis, with an average of 8h and 54min of daylight.

What is the average length of the day in December in Challis?

In December, the average day length is 8h and 54min.

When is the sunrise / sunset in December in Challis?

On the first day of December in Challis, sunrise is at 7:53 am and sunset at 4:58 pm. On the last day of the month, sunrise is at 8:13 am and sunset at 5:06 pm MST.

How long on average sun shines in December in Challis?

The average sunshine duration in December in Challis is 6h.

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

The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2.

What is the UV index intensity in December in Challis?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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
Challis, ID

Average temperature in December - Challis, ID
  • Average high temperature in December: 26.1°F

The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is December (26.1°F).

  • Average low temperature in December: 8.6°F

The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is January (8.1°F).

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Average pressure in December
Challis, ID

Average pressure in December - Challis, ID
  • Average pressure in December: 30.24"Hg

The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Challis, ID

Average wind speed in December - Challis, ID
  • Average wind speed in December: 5mph

The windiest months (with the highest average wind speed) are June and July (5.7mph).
The calmest month (with the lowest average wind speed) is January (4.8mph).

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Average humidity in December
Challis, ID

Average humidity in December - Challis, ID
  • Average humidity in December: 84%

The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are July and August (38%).

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Average rainfall in December
Challis, ID

Average rainfall in December - Challis, ID
  • Average rainfall in December: 0.51"

The wettest month (with the highest rainfall) is June (1.1").
The driest month (with the least rainfall) is July (0.28").

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Average rainfall days in December
Challis, ID

Average rainfall days in December - Challis, ID
  • Average rainfall days in December: 4.6 days

The month with the highest number of rainy days is June (10.2 days).
The month with the least rainy days is January (3.8 days).

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Average snowfall in December
Challis, ID

Average snowfall in December - Challis, ID
  • Average snowfall in December: 3.03"

The month with the highest snowfall is February (3.54").
The months with the least snowfall are July and August (0").

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Average snowfall days in December
Challis, ID

Average snowfall days in December - Challis, ID
  • Average snowfall days in December: 10.1 days

The month with the highest number of snowfall days is December (10.1 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in December /
Average sunshine in December
Challis, ID

Average daylight in December / Average sunshine in December - Challis, ID
  • Average daylight in December: 8h and 54min

The month with the longest days is June (Average daylight: 15h and 29min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in December: 6h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 48min).

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Average sunshine days in December
Challis, ID

Average sunshine days in December - Challis, ID
  • Average sunshine days in December: 19.3 days

The month with the most sunshine days is July (24.1 days).
The months with the least sunshine days are March and April (17.2 days).

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Average UV index in December
Challis, ID

Average UV index in December - Challis, ID
  • Average UV index in December: 2

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in December
Challis, ID

Average cloud cover in December - Challis, ID
  • Average cloud cover in December: 41

The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 11).

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Average visibility in December
Challis, ID

Average visibility in December - Challis, ID
  • Average visibility in December: 5mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).

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