2025 Compare Climate & Weather:
Big Sky, MT vs Sun Valley, ID

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Highlights

On average, there are 205 sunny days per year in Sun Valley. Big Sky averages 187 sunny days per year. The US average is 205 sunny days.

Sun Valley, Idaho gets 13.7 inches of rain, on average, per year. Big Sky, Montana gets 20.2 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Sun Valley averages 101.9 inches of snow per year. Big Sky averages 46.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Sun Valley, Idaho
Summer High: the July high is around 81.8 degrees
Winter Low: the January low is 7.6
Rain: averages 13.7 inches of rain a year
Snow: averages 101.9 inches of snow a year

Big Sky, Montana
Summer High: the July high is around 77.9 degrees
Winter Low: the January low is 7.6
Rain: averages 20.2 inches of rain a year
Snow: averages 46.1 inches of snow a year

BestPlaces Comfort Index

Sun Valley

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

6.3 / 10

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

Big Sky

The annual BestPlaces Comfort Index for Big Sky is 6.0 (10=best), which means it is one of the least comfortable places in Montana.

6 / 10

July, August and September are the most pleasant months in Big Sky, while December and January are the least comfortable months.

Average Monthly High / Low (°F)

Month	Big Sky, MT	Sun Valley, ID
January	31° / 8°	31° / 8°
February	35° / 8°	35° / 10°
March	43° / 16°	44° / 20°
April	50° / 22°	54° / 27°
May	59° / 30°	63° / 35°
June	68° / 36°	71° / 41°
July	78° / 40°	82° / 47°
August	77° / 39°	81° / 45°
September	68° / 32°	71° / 37°
October	54° / 24°	58° / 28°
November	38° / 15°	41° / 18°
December	28° / 7°	30° / 8°

Hot, Freezing, Rainy, Snowy Days: Big Sky / Sun Valley

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	31 / 31	11 / 8	4 / 8
February	0 / 0	28 / 28	9 / 7	3 / 7
March	0 / 0	30 / 29	11 / 7	4 / 5
April	0 / 0	29 / 23	10 / 7	3 / 2
May	0 / 0	21 / 10	13 / 8	1 / 0
June	0 / 0	8 / 3	13 / 8	0 / 0
July	1 / 3	2 / 0	10 / 5	0 / 0
August	1 / 2	3 / 1	9 / 5	0 / 0
September	0 / 0	16 / 7	9 / 5	0 / 0
October	0 / 0	27 / 22	8 / 5	1 / 1
November	0 / 0	29 / 29	10 / 7	4 / 5
December	0 / 0	31 / 31	12 / 8	4 / 9

July is the hottest month for Big Sky with an average high temperature of 77.9°, which ranks it as one of the coolest places in Montana. In Big Sky, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Big Sky are July, August and June.

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.

December has the coldest nighttime temperatures for Big Sky with an average of 6.5°. This is colder than most places in Montana.

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 Big Sky, there are 1.6 days annually when the high temperature is over 90°, which is one of the coolest places in Montana.

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.

In Big Sky, there are 253.5 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Montana.

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 Big Sky, there are 28.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Montana.

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.

June is the wettest month in Big Sky with 2.7 inches of rain, and the driest month is February with 1.0 inches. The wettest season is Autumn with 29% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 20.2 inches in Big Sky means that it is wetter than most places in Montana.

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 Big Sky with 12.7 days of rain, and October is the driest month with only 7.8 rainy days. There are 123.6 rainy days annually in Big Sky, which is one of the rainiest places in Montana. The rainiest season is Summer when it rains 27% of the time and the driest is Winter with only a 22% chance of a rainy day.

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 46.1 inches in Big Sky means that it is snowier than most places in Montana.

An annual snowfall of 101.9 inches in Sun Valley means that it is one of the snowiest places in Idaho.

January is the snowiest month in Big Sky with 8.6 inches of snow, and 8 months of the year have significant snowfall.

December is the snowiest month in Sun Valley with 28.4 inches of snow, and 8 months of the year have significant snowfall.

DID YOU KNOW?

Many people confuse Weather and Climate, but they are different. Weather refers to the conditions of the atmosphere over a short period of time, while Climate refers to the conditions of the atmosphere over a long period of time.

Weather, more specifically, refers to how the atmosphere behaves and its effects on life and human activities. Most people think of Weather in terms of what can be observed: temperature, humidity, precipitation, and cloudy/sunny conditions. Weather conditions constantly change on a minute-to-minute basis.

Climate is a record of the average weather conditions for a given place over a long period of time, often referred to as Climate Normals. A 30-year period of record is a common requirement to be considered a Climate Normal.

Reviews for Big Sky 2 Reviews

Jill · Sherman Oaks, CA

re:

Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More

| Reply

NC For Me · Apex, NC

re:

Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More

| Reply

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Reviews for Sun Valley 2 Reviews

Jill · Sherman Oaks, CA

re:

Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More

| Reply

NC For Me · Apex, NC

re:

Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More

| Reply

Start Your Review of Sun Valley

See all reviews

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2025 Compare Climate & Weather:
Big Sky, MT vs Sun Valley, ID

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Big Sky / Sun Valley

December has the coldest nighttime temperatures for Big Sky with an average of 6.5°. This is colder than most places in Montana.

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 Big Sky, there are 1.6 days annually when the high temperature is over 90°, which is one of the coolest places in Montana.

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.

In Big Sky, there are 253.5 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Montana.

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 Big Sky, there are 28.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Montana.

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.

An annual snowfall of 46.1 inches in Big Sky means that it is snowier than most places in Montana.

An annual snowfall of 101.9 inches in Sun Valley means that it is one of the snowiest places in Idaho.

January is the snowiest month in Big Sky with 8.6 inches of snow, and 8 months of the year have significant snowfall.

December is the snowiest month in Sun Valley with 28.4 inches of snow, and 8 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Big Sky 2 Reviews

Reviews for Sun Valley 2 Reviews

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2025 Compare Climate & Weather:Big Sky, MT vs Sun Valley, ID

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Big Sky / Sun Valley

December has the coldest nighttime temperatures for Big Sky with an average of 6.5°. This is colder than most places in Montana.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 Big Sky, there are 1.6 days annually when the high temperature is over 90°, which is one of the coolest places in Montana.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.

In Big Sky, there are 253.5 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Montana.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 Big Sky, there are 28.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Montana.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.

An annual snowfall of 46.1 inches in Big Sky means that it is snowier than most places in Montana.An annual snowfall of 101.9 inches in Sun Valley means that it is one of the snowiest places in Idaho.

January is the snowiest month in Big Sky with 8.6 inches of snow, and 8 months of the year have significant snowfall.December is the snowiest month in Sun Valley with 28.4 inches of snow, and 8 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Big Sky 2 Reviews

Reviews for Sun Valley 2 Reviews

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Zips In Big Sky, Montana

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2025 Compare Climate & Weather:
Big Sky, MT vs Sun Valley, ID

December has the coldest nighttime temperatures for Big Sky with an average of 6.5°. This is colder than most places in Montana.

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 Big Sky, there are 1.6 days annually when the high temperature is over 90°, which is one of the coolest places in Montana.

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.

In Big Sky, there are 253.5 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Montana.

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 Big Sky, there are 28.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Montana.

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.

An annual snowfall of 46.1 inches in Big Sky means that it is snowier than most places in Montana.

An annual snowfall of 101.9 inches in Sun Valley means that it is one of the snowiest places in Idaho.

January is the snowiest month in Big Sky with 8.6 inches of snow, and 8 months of the year have significant snowfall.

December is the snowiest month in Sun Valley with 28.4 inches of snow, and 8 months of the year have significant snowfall.