Sun Valley
Idaho, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Sun Valley, ID

The iconic Sun Valley, Idaho, in a stunning hilly landscape on either side located within the famous White Cloud Wilderness, white clouds above
The iconic Sun Valley, Idaho, in a stunning hilly landscape on either side located within the famous White Cloud Wilderness, white clouds above
January, like December, is another subzero cold winter month in Sun Valley, Idaho, with average temperature ranging between max 30°F (-1.1°C) and min 0.3°F (-17.6°C).

Temperature

With an average high-temperature of 30°F (-1.1°C) and an average low-temperature of 0.3°F (-17.6°C), January is the coldest month.

Rainfall

In Sun Valley, during January, the rain falls for 13 days and regularly aggregates up to 2.6" (65.8mm) of precipitation. In Sun Valley, during the entire year, the rain falls for 122 days and collects up to 17.2" (438.1mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. The month with the most snowfall in Sun Valley is January when 36" (914.4mm) of snow is typically aggregated.

Daylight

The average length of the day is 9.4h.

Sunshine

Months with the least sunshine in Sun Valley are January, November and December, with an average of 4h of sunshine.

UV index

In January, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
The average daily UV index of 2 transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the coldest month in Sun Valley?

With an average high-temperature of 30°F (-1.1°C) and an average low-temperature of 0.3°F (-17.6°C), January is the coldest month in Sun Valley.

What is the temperature in January in Sun Valley?

The average high-temperature, in January, is 30°F (-1.1°C), while the average low-temperature is 0.3°F (-17.6°C).

How many days does it rain in January in Sun Valley?

In January, in Sun Valley, Idaho, the rain falls for 13 days. Throughout January, 2.6" (65.8mm) of precipitation is accumulated.

How much does it snow in Sun Valley in January?

Throughout January, 36" (914.4mm) of snow is accumulated.

What is the snowiest month in Sun Valley?

The month with the most snowfall in Sun Valley is January when 36" (914.4mm) of snow is typically aggregated.

What is the average length of the day in January in Sun Valley?

In Sun Valley, the average length of the day in January is 9.4h.

What is the month with the least sunshine in Sun Valley?

Months with the least sunshine in Sun Valley are January, November and December, with an average of 4h of sunshine.

How many hours of sunshine does Sun Valley have in January?

In January, the average sunshine is 4h.

How high is the UV index in January in Sun Valley?

The average daily maximum UV index in January in Sun Valley is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the UV radiation.
Average temperature in January - Sun Valley, ID
  • Average high temperature in January: 30°F

The warmest month (with the highest average high temperature) is July (82.5°F).
The month with the lowest average high temperature is January (30°F).

  • Average low temperature in January: 0.3°F

The month with the highest average low temperature is July (38.3°F).
The coldest month (with the lowest average low temperature) is January (0.3°F).

Average rainfall in January - Sun Valley, ID
  • Average rainfall in January: 2.6"

Wettest months (with the highest rainfall) are January and December (2.6").
The driest month (with the lowest rainfall) is July (0.7").

Average rainfall days in January - Sun Valley, ID
  • Average rainfall days in January: 13 days

Months with the highest number of rainy days are January, March and December (13 days).
Months with the lowest number of rainy days are July and October (7 days).

Average snowfall in January - Sun Valley, ID
  • Average snowfall in January: 36"

The month with the highest snowfall is January (36").
Months with the lowest snowfall are June, July and August (0").

Average daylight in January / Average sunshine in January - Sun Valley, ID
  • Average daylight in January: 9.4h

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 January: 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 January - Sun Valley, ID
  • Average UV index in January: 2

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