Sun Valley, Idaho 

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Climate in Sun Valley, Idaho

Sun Valley, Idaho gets 14 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Sun Valley averages 102 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 205 sunny days per year in Sun Valley. The US average is 205 sunny days.

Sun Valley gets some kind of precipitation, on average, 78 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 82 degrees
Winter Low: the January low is 8
Rain: averages 14 inches of rain a year
Snow: averages 102 inches of snow a year


The annual BestPlaces Comfort Index for Sun Valley is 6.3 (10=best), which means it is less comfortable than most places in Idaho.

8.8 / 3.5

Summer   /   Winter
July, August and September are the most pleasant months in Sun Valley, while December and January are the least comfortable months.

Climate Averages
  Sun Valley, IdahoUnited States
  13.7 in.38.1 in.
  101.9 in.27.8 in.
  77.8 days106.2 days
  205 days205 days
  5945 ft.2443 ft.


Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Sun Valley with an average high temperature of 81.8°, which ranks it as cooler than most places in Idaho. In Sun Valley, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sun Valley are August, July and June.

In Sun Valley, there are 4.9 days annually when the high temperature is over 90°, which is one of the coolest places in Idaho.

January has the coldest nighttime temperatures for Sun Valley with an average of 7.6°. This is one of the coldest places in Idaho.

In Sun Valley, there are 211.5 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Idaho.

In Sun Valley, there are 21.2 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Idaho.

Humidity is very low in Sun Valley, so low that the dry air may be uncomfortable for some people. There are few days during the year when the humidity is even noticable. A very dry climate can lead to cracked, itchy skin and dry eyes.

December is the wettest month in Sun Valley with 1.7 inches of rain, and the driest month is August with 0.6 inches. The wettest season is Spring with 32% of yearly precipitation and 19% occurs in Autumn, which is the driest season. The annual rainfall of 13.7 inches in Sun Valley means that it is about average compared to other places in Idaho.

May is the rainiest month in Sun Valley with 8.4 days of rain, and September is the driest month with only 4.5 rainy days. There are 77.8 rainy days annually in Sun Valley, which is less rainy than most places in Idaho. The rainiest season is Spring when it rains 28% of the time and the driest is Winter with only a 21% chance of a rainy day.

An annual snowfall of 101.9 inches in Sun Valley means that it is one of the snowiest places in Idaho. December is the snowiest month in Sun Valley with 28.4 inches of snow, and 8 months of the year have significant snowfall.

  • Annual Rainfall (US Avg: 36.5")
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    Reviews for Sun Valley    5 Reviews
    Sun Valley - Retirement Community for the Rich - 5/22/2010
    Young people living in Sun Valley, unless they have a trust fund can expect to have a difficult time here. The average age seems to be approx 78. Any business that is... Read More

    Start Your Review of Sun Valley

    Sun Valley....a love/hate relationship! - 9/7/2007
    Absolutely beautiful. Nice people. Amazing skiing...all types of recreation for anyone and everyone. Summer temperatures are perfect. It's sunny more than 250 days... Read More

    short seasons - 3/9/2006
    Winters are long, and summers can be short!!! The physcial beauty of the area is unbeatable,... Read More

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