December weather forecast
Rupert, ID

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Weather in December

The city of Rupert, Idaho sees the year off under the stronghold of winter in December. The sharp descent from November’s weather conditions is quite striking. Characterized by shorter days and the triumphant return of snowfall, December identifies as very much a winter month. Against the practically absent snowfall in November, it's an unmistakable herald of the full-fledged winter setting up its reign for the coming January.

Temperature

Rupert's December weather reaches an average high of 32.5°F (0.3°C) and an average low of 21.6°F (-5.8°C), making it the coldest month.

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Rupert, in December, it is raining for 8.7 days, with typically 1.34" (34mm) of accumulated precipitation. Throughout the year, in Rupert, there are 105.2 rainfall days, and 10.63" (270mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. The month with the most snowfall is December, when snow falls for 13 days and typically aggregates up to 6.54" (166mm) of snow.

Daylight

The month with the shortest days in Rupert is December, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 7:45 am and sunset at 5:02 pm. On the last day of December, in Rupert, sunrise is at 8:04 am and sunset at 5:11 pm MST.

Sunshine

In December, the average sunshine in Rupert is 5.8h.

UV index

The month with the lowest UV index in Rupert is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the maximum UV index of 1 translates into these guidelines:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always 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-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.

Frequently asked questions

What month is the coldest in Rupert?

The coldest month in Rupert is December, with an average high-temperature of 32.5°F (0.3°C) and an average low-temperature of 21.6°F (-5.8°C).

How cold is December in Rupert?

During December, Rupert experiences an average high-temperature of 32.5°F (0.3°C) and a low-temperature of 21.6°F (-5.8°C).

What is the average humidity in December in Rupert?

In Rupert, the average relative humidity in December is 79%.

How much does it rain in Rupert in December?

In Rupert, in December, it is raining for 8.7 days, with typically 1.34" (34mm) of accumulated precipitation.

What is the snowiest month in Rupert?

December is the month with the most snowfall. Snow falls for 13 days and accumulates 6.54" (166mm) of snow.

How many days does it snow in December in Rupert?

In December, in Rupert, Idaho, it is snowing for 13 days. Throughout December, 6.54" (166mm) of snow is accumulated.

What is the month with the shortest days in Rupert?

The month with the shortest days in Rupert is December, with an average of 9h and 6min of daylight.

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

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

What time are sunrise and sunset in December in Rupert?

In December, on the first day of the month, sunrise is at 7:45 am and sunset at 5:02 pm. On the last day of the month, in Rupert, Idaho, sunrise is at 8:04 am and sunset at 5:11 pm MST.

How long on average sun shines in December in Rupert?

The average sunshine duration in December in Rupert, Idaho, is 5.8h.

When is the lowest UV index in Rupert?

The month with the lowest UV index in Rupert, Idaho, is December, with an average maximum UV index of 1.

What is the UV index intensity in December in Rupert?

The average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a low health risk from unsafe 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
Rupert, ID

Average temperature in December - Rupert, ID
  • Average high temperature in December: 32.5°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (32.5°F).

  • Average low temperature in December: 21.6°F

The months with the highest average low temperature are July and August (60.8°F).
The coldest month (with the lowest average low temperature) is December (21.6°F).

Average pressure in December
Rupert, ID

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

The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

Average wind speed in December
Rupert, ID

Average wind speed in December - Rupert, ID
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is April (9.8mph).
The calmest month (with the lowest average wind speed) is January (7.1mph).

Average humidity in December
Rupert, ID

Average humidity in December - Rupert, ID
  • Average humidity in December: 79%

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

Average rainfall in December
Rupert, ID

Average rainfall in December - Rupert, ID
  • Average rainfall in December: 1.34"

The wettest month (with the highest rainfall) is March (1.46").
The driest month (with the least rainfall) is July (0.28").

Average rainfall days in December
Rupert, ID

Average rainfall days in December - Rupert, ID
  • Average rainfall days in December: 8.7 days

The months with the highest number of rainy days are March and April (14 days).
The months with the least rainy days are July and August (5.2 days).

Average snowfall in December
Rupert, ID

Average snowfall in December - Rupert, ID
  • Average snowfall in December: 6.54"

The month with the highest snowfall is December (6.54").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
Rupert, ID

Average snowfall days in December - Rupert, ID
  • Average snowfall days in December: 13 days

The month with the highest number of snowfall days is December (13 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Rupert, 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 January (Average sunshine: 5h and 42min).

Average sunshine days in December
Rupert, ID

Average sunshine days in December - Rupert, ID
  • Average sunshine days in December: 13.8 days

The month with the most sunshine days is July (22.6 days).
The month with the least sunshine days is March (12 days).

Average UV index in December
Rupert, ID

Average UV index in December - Rupert, ID
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Rupert, ID

Average cloud cover in December - Rupert, 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 11).

Average visibility in December
Rupert, ID

Average visibility in December - Rupert, 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).

Rupert, Idaho, USA

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