2025 Compare Climate & Weather:
Thermopolis, WY vs Ketchum, ID

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Highlights

On average, there are 204 sunny days per year in Ketchum. Thermopolis averages 235 sunny days per year. The US average is 205 sunny days.

Ketchum, Idaho gets 13.8 inches of rain, on average, per year. Thermopolis, Wyoming gets 11.1 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Ketchum averages 101.6 inches of snow per year. Thermopolis averages 21.8 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Ketchum, Idaho
Summer High: the July high is around 81.8 degrees
Winter Low: the January low is 7.6
Rain: averages 13.8 inches of rain a year
Snow: averages 101.6 inches of snow a year

Thermopolis, Wyoming
Summer High: the July high is around 90.4 degrees
Winter Low: the January low is 6.5
Rain: averages 11.1 inches of rain a year
Snow: averages 21.8 inches of snow a year

BestPlaces Comfort Index

Ketchum

The annual BestPlaces Comfort Index for Ketchum 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 Ketchum, while December and January are the least comfortable months.

Thermopolis

The annual BestPlaces Comfort Index for Thermopolis is 7.0 (10=best), which means it is one of the most pleasant places in Wyoming.

7 / 10

June, September and May are the most pleasant months in Thermopolis, while December and January are the least comfortable months.

Average Monthly High / Low (°F)

Month	Thermopolis, WY	Ketchum, ID
January	36° / 7°	31° / 8°
February	41° / 12°	35° / 10°
March	52° / 22°	44° / 20°
April	61° / 31°	54° / 27°
May	71° / 41°	63° / 35°
June	81° / 49°	71° / 41°
July	90° / 56°	82° / 47°
August	89° / 54°	81° / 45°
September	77° / 43°	71° / 37°
October	62° / 32°	58° / 28°
November	47° / 19°	41° / 18°
December	34° / 7°	30° / 8°

Hot, Freezing, Rainy, Snowy Days: Thermopolis / Ketchum

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	31 / 31	3 / 8	2 / 8
February	0 / 0	28 / 28	3 / 7	2 / 7
March	0 / 0	27 / 29	5 / 7	2 / 5
April	0 / 0	16 / 23	7 / 7	1 / 2
May	1 / 0	3 / 10	8 / 8	0 / 0
June	6 / 0	0 / 3	8 / 8	0 / 0
July	17 / 3	0 / 0	5 / 5	0 / 0
August	15 / 2	0 / 1	5 / 5	0 / 0
September	3 / 0	3 / 7	5 / 4	0 / 0
October	0 / 0	16 / 22	5 / 5	1 / 1
November	0 / 0	27 / 29	4 / 7	2 / 5
December	0 / 0	31 / 31	4 / 8	3 / 9

July is the hottest month for Thermopolis with an average high temperature of 90.4°, which ranks it as one of the hottest places in Wyoming. In Thermopolis, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Thermopolis are September, June and May.

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

January has the coldest nighttime temperatures for Thermopolis with an average of 6.5°. This is colder than most places in Wyoming.

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

In Thermopolis, there are 41.4 days annually when the high temperature is over 90°, which is one of the hottest places in Wyoming.

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

In Thermopolis, there are 181.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Wyoming.

In Ketchum, there are 211.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Idaho.

In Thermopolis, there are 23.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Wyoming.

In Ketchum, there are 21.1 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Idaho.

May is the wettest month in Thermopolis with 1.8 inches of rain, and the driest month is January with 0.3 inches. The wettest season is Summer with 37% of yearly precipitation and 10% occurs in Spring, which is the driest season. The annual rainfall of 11.1 inches in Thermopolis means that it is drier than most places in Wyoming.

December is the wettest month in Ketchum with 1.8 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 13.8 inches in Ketchum means that it is about average compared to other places in Idaho.

May is the rainiest month in Thermopolis with 8.1 days of rain, and January is the driest month with only 3.2 rainy days. There are 60.8 rainy days annually in Thermopolis, which is less rainy than most places in Wyoming. The rainiest season is Summer when it rains 32% of the time and the driest is Spring with only a 16% chance of a rainy day.

May is the rainiest month in Ketchum with 8.3 days of rain, and September is the driest month with only 4.4 rainy days. There are 77.5 rainy days annually in Ketchum, which is less rainy than most places in Idaho. The rainiest season is Spring when it rains 29% of the time and the driest is Winter with only a 21% chance of a rainy day.

An annual snowfall of 21.8 inches in Thermopolis means that it is one of the least snowy places in Wyoming.

An annual snowfall of 101.6 inches in Ketchum means that it is one of the snowiest places in Idaho.

January is the snowiest month in Thermopolis with 4.1 inches of snow, and 7 months of the year have significant snowfall.

December is the snowiest month in Ketchum with 28.3 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 Thermopolis 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 Ketchum 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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2025 Compare Climate & Weather:
Thermopolis, WY vs Ketchum, ID

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Thermopolis / Ketchum

January has the coldest nighttime temperatures for Thermopolis with an average of 6.5°. This is colder than most places in Wyoming.

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

In Thermopolis, there are 41.4 days annually when the high temperature is over 90°, which is one of the hottest places in Wyoming.

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

In Thermopolis, there are 181.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Wyoming.

In Ketchum, there are 211.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Idaho.

In Thermopolis, there are 23.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Wyoming.

In Ketchum, there are 21.1 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Idaho.

An annual snowfall of 21.8 inches in Thermopolis means that it is one of the least snowy places in Wyoming.

An annual snowfall of 101.6 inches in Ketchum means that it is one of the snowiest places in Idaho.

January is the snowiest month in Thermopolis with 4.1 inches of snow, and 7 months of the year have significant snowfall.

December is the snowiest month in Ketchum with 28.3 inches of snow, and 8 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Thermopolis 2 Reviews

Reviews for Ketchum 2 Reviews

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2025 Compare Climate & Weather:Thermopolis, WY vs Ketchum, ID

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Thermopolis / Ketchum

January has the coldest nighttime temperatures for Thermopolis with an average of 6.5°. This is colder than most places in Wyoming.January has the coldest nighttime temperatures for Ketchum with an average of 7.6°. This is one of the coldest places in Idaho.

In Thermopolis, there are 41.4 days annually when the high temperature is over 90°, which is one of the hottest places in Wyoming.In Ketchum, there are 4.9 days annually when the high temperature is over 90°, which is one of the coolest places in Idaho.

In Thermopolis, there are 181.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Wyoming.In Ketchum, there are 211.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Idaho.

In Thermopolis, there are 23.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Wyoming.In Ketchum, there are 21.1 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Idaho.

An annual snowfall of 21.8 inches in Thermopolis means that it is one of the least snowy places in Wyoming.An annual snowfall of 101.6 inches in Ketchum means that it is one of the snowiest places in Idaho.

January is the snowiest month in Thermopolis with 4.1 inches of snow, and 7 months of the year have significant snowfall.December is the snowiest month in Ketchum with 28.3 inches of snow, and 8 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Thermopolis 2 Reviews

Reviews for Ketchum 2 Reviews

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Zips In Thermopolis, Wyoming

Zips In KETCHUM, IDAHO

Learn More About THERMOPOLIS, WYOMING

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2025 Compare Climate & Weather:
Thermopolis, WY vs Ketchum, ID

January has the coldest nighttime temperatures for Thermopolis with an average of 6.5°. This is colder than most places in Wyoming.

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

In Thermopolis, there are 41.4 days annually when the high temperature is over 90°, which is one of the hottest places in Wyoming.

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

In Thermopolis, there are 181.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Wyoming.

In Ketchum, there are 211.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Idaho.

In Thermopolis, there are 23.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Wyoming.

In Ketchum, there are 21.1 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Idaho.

An annual snowfall of 21.8 inches in Thermopolis means that it is one of the least snowy places in Wyoming.

An annual snowfall of 101.6 inches in Ketchum means that it is one of the snowiest places in Idaho.

January is the snowiest month in Thermopolis with 4.1 inches of snow, and 7 months of the year have significant snowfall.

December is the snowiest month in Ketchum with 28.3 inches of snow, and 8 months of the year have significant snowfall.