2025 Compare Climate & Weather:
Custer, SD vs Thermopolis, WY

Change Cities

Highlights

On average, there are 235 sunny days per year in Thermopolis. Custer averages 226 sunny days per year. The US average is 205 sunny days.

Thermopolis, Wyoming gets 11.1 inches of rain, on average, per year. Custer, South Dakota gets 19.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Thermopolis averages 21.8 inches of snow per year. Custer averages 55.3 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Custer, South Dakota
Summer High: the July high is around 79.5 degrees
Winter Low: the January low is 15.5
Rain: averages 19.9 inches of rain a year
Snow: averages 55.3 inches of snow a year

BestPlaces Comfort Index

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.

Custer

The annual BestPlaces Comfort Index for Custer is 6.7 (10=best), which means it is less comfortable than most places in South Dakota.

6.7 / 10

August, July and June are the most pleasant months in Custer, while February and December are the least comfortable months.

Average Monthly High / Low (°F)

Month	Custer, SD	Thermopolis, WY
January	36° / 16°	36° / 7°
February	37° / 17°	41° / 12°
March	43° / 23°	52° / 22°
April	51° / 29°	61° / 31°
May	61° / 39°	71° / 41°
June	71° / 48°	81° / 49°
July	80° / 55°	90° / 56°
August	78° / 53°	89° / 54°
September	69° / 44°	77° / 43°
October	55° / 33°	62° / 32°
November	43° / 23°	47° / 19°
December	35° / 15°	34° / 7°

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

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	29 / 31	4 / 3	4 / 2
February	0 / 0	26 / 28	5 / 3	5 / 2
March	0 / 0	26 / 27	6 / 5	5 / 2
April	0 / 0	19 / 16	9 / 7	4 / 1
May	0 / 1	7 / 3	13 / 8	1 / 0
June	1 / 6	0 / 0	12 / 8	0 / 0
July	3 / 17	0 / 0	11 / 5	0 / 0
August	1 / 15	0 / 0	9 / 5	0 / 0
September	0 / 3	3 / 3	8 / 5	0 / 0
October	0 / 0	14 / 16	7 / 5	2 / 1
November	0 / 0	24 / 27	4 / 4	3 / 2
December	0 / 0	29 / 31	4 / 4	4 / 3

July is the hottest month for Custer with an average high temperature of 79.5°, which ranks it as one of the coolest places in South Dakota. In Custer, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Custer are August, July and June.

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.

December has the coldest nighttime temperatures for Custer with an average of 15.2°. This is one of the warmest places in South Dakota.

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

In Custer, there are 4.7 days annually when the high temperature is over 90°, which is one of the coolest places in South Dakota.

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 Custer, there are 177.0 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in South Dakota.

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 Custer, there are 12.6 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.

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

May is the wettest month in Custer with 3.6 inches of rain, and the driest month is January with 0.3 inches. The wettest season is Autumn with 40% of yearly precipitation and 7% occurs in Spring, which is the driest season. The annual rainfall of 19.9 inches in Custer means that it is drier than most places in South Dakota.

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.

May is the rainiest month in Custer with 12.8 days of rain, and January is the driest month with only 3.9 rainy days. There are 93.0 rainy days annually in Custer, which is one of the rainiest places in South Dakota. The rainiest season is Autumn when it rains 36% of the time and the driest is Spring with only a 14% chance of a rainy day.

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.

An annual snowfall of 55.3 inches in Custer means that it is one of the snowiest places in South Dakota.

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

April is the snowiest month in Custer with 11.5 inches of snow, and 9 months of the year have significant snowfall.

January is the snowiest month in Thermopolis with 4.1 inches of snow, and 7 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 Custer 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 Custer

See all reviews

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

Start Your Review of Thermopolis

See all reviews

Compare Cost of Living

Compare Custer Cost of Living vs Thermopolis Cost of Living: Taxes, Childcare, Groceries, Health...

Compare now

Premium Subscription

Includes Cost of Living compares for child care, utilities, transportation, health, taxes, housing for home owners vs renters, weather, insurance premiums and so much more.

Upgrade now

Compare City	Compared To This City
San Mateo, California	Chicago, Illinois	Compare
East Islip, New York	Milton, Delaware	Compare
Boston, Massachusetts	Apex, North Carolina	Compare
Cumberland, Rhode Island	Newport, Rhode Island	Compare
Boone, North Carolina	Duluth, Minnesota	Compare
Washington, District of Columbia	Charleston, South Carolina	Compare
Denver, Colorado	Boise City, Idaho	Compare
Denver, Colorado	Boise City, Idaho	Compare
San Diego, California	Las Vegas, Nevada	Compare
Allen, Texas	Eastvale, California	Compare

2025 Compare Climate & Weather:
Custer, SD vs Thermopolis, WY

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

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

December has the coldest nighttime temperatures for Custer with an average of 15.2°. This is one of the warmest places in South Dakota.

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

In Custer, there are 4.7 days annually when the high temperature is over 90°, which is one of the coolest places in South Dakota.

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 Custer, there are 177.0 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in South Dakota.

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 Custer, there are 12.6 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.

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

An annual snowfall of 55.3 inches in Custer means that it is one of the snowiest places in South Dakota.

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

April is the snowiest month in Custer with 11.5 inches of snow, and 9 months of the year have significant snowfall.

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

DID YOU KNOW?

Reviews for Custer 2 Reviews

Reviews for Thermopolis 2 Reviews

Most Recent Searches On Compare Climate & Weather

Compare Cost of Living

Zips In Custer, South Dakota

Zips In THERMOPOLIS, WYOMING

Learn More About CUSTER, SOUTH DAKOTA

Learn More About Thermopolis, Wyoming

Premium Subscription

BestPlaces Tools

About BestPlaces

Follow Us

2025 Compare Climate & Weather:Custer, SD vs Thermopolis, WY

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

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

December has the coldest nighttime temperatures for Custer with an average of 15.2°. This is one of the warmest places in South Dakota.January has the coldest nighttime temperatures for Thermopolis with an average of 6.5°. This is colder than most places in Wyoming.

In Custer, there are 4.7 days annually when the high temperature is over 90°, which is one of the coolest places in South Dakota.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 Custer, there are 177.0 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in South Dakota.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 Custer, there are 12.6 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.In Thermopolis, there are 23.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Wyoming.

An annual snowfall of 55.3 inches in Custer means that it is one of the snowiest places in South Dakota.An annual snowfall of 21.8 inches in Thermopolis means that it is one of the least snowy places in Wyoming.

April is the snowiest month in Custer with 11.5 inches of snow, and 9 months of the year have significant snowfall.January is the snowiest month in Thermopolis with 4.1 inches of snow, and 7 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Custer 2 Reviews

Reviews for Thermopolis 2 Reviews

Most Recent Searches On Compare Climate & Weather

Compare Cost of Living

Zips In Custer, South Dakota

Zips In THERMOPOLIS, WYOMING

Learn More About CUSTER, SOUTH DAKOTA

Learn More About Thermopolis, Wyoming

Premium Subscription

BestPlaces Tools

About BestPlaces

Follow Us

2025 Compare Climate & Weather:
Custer, SD vs Thermopolis, WY

December has the coldest nighttime temperatures for Custer with an average of 15.2°. This is one of the warmest places in South Dakota.

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

In Custer, there are 4.7 days annually when the high temperature is over 90°, which is one of the coolest places in South Dakota.

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 Custer, there are 177.0 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in South Dakota.

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 Custer, there are 12.6 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.

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

An annual snowfall of 55.3 inches in Custer means that it is one of the snowiest places in South Dakota.

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

April is the snowiest month in Custer with 11.5 inches of snow, and 9 months of the year have significant snowfall.

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