Idaho Falls
Idaho, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Idaho Falls, ID

An eye-catching shot of the Snake River, Idaho Falls, with a clear view of the iconic Idaho Falls Temple in the back, through the trees
An eye-catching shot of the Snake River, Idaho Falls, with a clear view of the iconic Idaho Falls Temple in the back, through the trees
December, the first month of the winter, in Idaho Falls, is still a freezing cold month, with average temperature varying between 31.3°F (-0.4°C) and 13.5°F (-10.3°C).

Temperature

In December, the average high-temperature drops, from a chilly 43°F (6.1°C) in November, to a freezing cold 31.3°F (-0.4°C). In December, the average low-temperature is 13.5°F (-10.3°C).

Rainfall

In Idaho Falls, during December, the rain falls for 11 days and regularly aggregates up to 1.3" (32mm) of precipitation. In Idaho Falls, during the entire year, the rain falls for 100 days and collects up to 14.2" (361.1mm) of precipitation.

Daylight

December has the shortest days of the year in Idaho Falls, with an average of 9h of daylight.

Sunshine

January, November and December, with an average of 4h of sunshine, are months with the least sunshine in Idaho Falls, Idaho.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to the UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in December in Idaho Falls?

The average high-temperature, in December, in Idaho Falls, Idaho, is 31.3°F (-0.4°C), while the average low-temperature is 13.5°F (-10.3°C).

How much does it rain in Idaho Falls in December?

In Idaho Falls, during December, the rain falls for 11 days and regularly aggregates up to 1.3" (32mm) of precipitation.

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

With an average of 9h of daylight, December has the shortest days of the year in Idaho Falls, Idaho.

How many hours of daylight does Idaho Falls have in December?

The average length of the day in December in Idaho Falls is 9h.

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

January, November and December, with an average of 4h of sunshine, are months with the least sunshine in Idaho Falls, Idaho.

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

The average sunshine in December is 4h.

What is the month with the lowest UV index in Idaho Falls?

Months with the lowest UV index in Idaho Falls, Idaho, are January and December, with an average maximum UV index of 1.

How high is the UV index in December in Idaho Falls?

In December, the average daily maximum UV index in Idaho Falls is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV rays.
Average temperature in December - Idaho Falls, ID
  • Average high temperature in December: 31.3°F

The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in December: 13.4°F

The month with the highest average low temperature is July (51.4°F).
The coldest month (with the lowest average low temperature) is January (12.5°F).

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

The wettest month (with the highest rainfall) is May (2").
The driest month (with the lowest rainfall) is July (0.7").

Average rainfall days in December - Idaho Falls, ID
  • Average rainfall days in December: 11 days

Months with the highest number of rainy days are January and December (11 days).
Months with the lowest number of rainy days are July and October (5 days).

Average daylight in December / Average sunshine in December - Idaho Falls, ID
  • Average daylight in December: 9h

The month with the longest days is June (Average daylight: 15.4h).
The month with shortest days is December (Average daylight: 9h).

  • Average sunshine in December: 4h

The month with most sunshine is July (Average sunshine: 12h).
Months with least sunshine are January, November and December (Average sunshine: 4).

Average UV index in December - Idaho Falls, ID
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 10).
Months with the lowest UV index are January and December (UV index 1).