2025 Compare Climate & Weather:
Waterloo, IA vs Sioux City, IA

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Highlights

On average, there are 210 sunny days per year in Sioux City. Waterloo averages 194 sunny days per year. The US average is 205 sunny days.

Sioux City, Iowa gets 29.5 inches of rain, on average, per year. Waterloo, Iowa gets 35.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Sioux City averages 32.3 inches of snow per year. Waterloo averages 33.9 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Sioux City, Iowa
Summer High: the July high is around 85.5 degrees
Winter Low: the January low is 9.6
Rain: averages 29.5 inches of rain a year
Snow: averages 32.3 inches of snow a year

Waterloo, Iowa
Summer High: the July high is around 83.4 degrees
Winter Low: the January low is 8.4
Rain: averages 35.7 inches of rain a year
Snow: averages 33.9 inches of snow a year

BestPlaces Comfort Index

Sioux City

The annual BestPlaces Comfort Index for Sioux City is 7.0 (10=best), which means it is more comfortable than most places in Iowa.

7 / 10

June, September and August are the most pleasant months in Sioux City, while January and December are the least comfortable months.

Waterloo

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

6.7 / 10

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

Average Monthly High / Low (°F)

Month	Waterloo, IA	Sioux City, IA
January	26° / 8°	30° / 10°
February	31° / 13°	34° / 14°
March	44° / 25°	47° / 25°
April	59° / 37°	62° / 36°
May	71° / 48°	73° / 49°
June	80° / 58°	82° / 59°
July	83° / 62°	86° / 63°
August	81° / 60°	83° / 61°
September	74° / 50°	76° / 50°
October	61° / 38°	63° / 38°
November	45° / 26°	46° / 25°
December	30° / 13°	31° / 13°

Hot, Freezing, Rainy, Snowy Days: Waterloo / Sioux City

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	30 / 31	7 / 5	6 / 4
February	0 / 0	26 / 27	7 / 4	5 / 3
March	0 / 0	23 / 24	9 / 7	3 / 3
April	0 / 0	9 / 11	10 / 9	1 / 1
May	0 / 1	1 / 1	12 / 10	0 / 0
June	3 / 4	0 / 0	11 / 10	0 / 0
July	5 / 7	0 / 0	9 / 8	0 / 0
August	3 / 5	0 / 0	9 / 8	0 / 0
September	1 / 2	1 / 1	8 / 7	0 / 0
October	0 / 0	9 / 9	8 / 6	0 / 0
November	0 / 0	22 / 23	8 / 6	2 / 2
December	0 / 0	30 / 30	8 / 5	6 / 4

July is the hottest month for Waterloo with an average high temperature of 83.4°, which ranks it as cooler than most places in Iowa. In Waterloo, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Waterloo are June, August and September.

July is the hottest month for Sioux City with an average high temperature of 85.5°, which ranks it as warmer than most places in Iowa. In Sioux City, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sioux City are September, June and August.

January has the coldest nighttime temperatures for Waterloo with an average of 8.4°. This is colder than most places in Iowa.

January has the coldest nighttime temperatures for Sioux City with an average of 9.6°. This is about average compared to other places in Iowa.

In Waterloo, there are 11.5 days annually when the high temperature is over 90°, which is cooler than most places in Iowa.

In Sioux City, there are 19.8 days annually when the high temperature is over 90°, which is one of the hottest places in Iowa.

In Waterloo, there are 150.4 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Iowa.

In Sioux City, there are 155.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Iowa.

In Waterloo, there are 21.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Iowa.

In Sioux City, there are 18.9 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Iowa.

June is the wettest month in Waterloo with 5.2 inches of rain, and the driest month is January with 0.9 inches. The wettest season is Autumn with 41% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 35.7 inches in Waterloo means that it is about average compared to other places in Iowa.

June is the wettest month in Sioux City with 4.1 inches of rain, and the driest month is February with 0.7 inches. The wettest season is Autumn with 37% of yearly precipitation and 8% occurs in Spring, which is the driest season. The annual rainfall of 29.5 inches in Sioux City means that it is one of the driest places in Iowa.

May is the rainiest month in Waterloo with 11.9 days of rain, and February is the driest month with only 6.5 rainy days. There are 105.3 rainy days annually in Waterloo, which is rainier than most places in Iowa. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 20% chance of a rainy day.

May is the rainiest month in Sioux City with 10.3 days of rain, and February is the driest month with only 4.1 rainy days. There are 83.7 rainy days annually in Sioux City, which is one of the least rainy places in Iowa. The rainiest season is Summer when it rains 31% of the time and the driest is Spring with only a 16% chance of a rainy day.

An annual snowfall of 33.9 inches in Waterloo means that it is snowier than most places in Iowa.

An annual snowfall of 32.3 inches in Sioux City means that it is snowier than most places in Iowa.

December is the snowiest month in Waterloo with 9.6 inches of snow, and 6 months of the year have significant snowfall.

December is the snowiest month in Sioux City with 7.3 inches of snow, and 6 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 Waterloo 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 Sioux City 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:
Waterloo, IA vs Sioux City, IA

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Waterloo / Sioux City

January has the coldest nighttime temperatures for Waterloo with an average of 8.4°. This is colder than most places in Iowa.

January has the coldest nighttime temperatures for Sioux City with an average of 9.6°. This is about average compared to other places in Iowa.

In Waterloo, there are 11.5 days annually when the high temperature is over 90°, which is cooler than most places in Iowa.

In Sioux City, there are 19.8 days annually when the high temperature is over 90°, which is one of the hottest places in Iowa.

In Waterloo, there are 21.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Iowa.

In Sioux City, there are 18.9 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Iowa.

An annual snowfall of 33.9 inches in Waterloo means that it is snowier than most places in Iowa.

An annual snowfall of 32.3 inches in Sioux City means that it is snowier than most places in Iowa.

December is the snowiest month in Waterloo with 9.6 inches of snow, and 6 months of the year have significant snowfall.

December is the snowiest month in Sioux City with 7.3 inches of snow, and 6 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Waterloo 2 Reviews

Reviews for Sioux City 2 Reviews

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2025 Compare Climate & Weather:Waterloo, IA vs Sioux City, IA

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Waterloo / Sioux City

January has the coldest nighttime temperatures for Waterloo with an average of 8.4°. This is colder than most places in Iowa.January has the coldest nighttime temperatures for Sioux City with an average of 9.6°. This is about average compared to other places in Iowa.

In Waterloo, there are 11.5 days annually when the high temperature is over 90°, which is cooler than most places in Iowa.In Sioux City, there are 19.8 days annually when the high temperature is over 90°, which is one of the hottest places in Iowa.

In Waterloo, there are 150.4 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Iowa.In Sioux City, there are 155.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Iowa.

In Waterloo, there are 21.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Iowa.In Sioux City, there are 18.9 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Iowa.

An annual snowfall of 33.9 inches in Waterloo means that it is snowier than most places in Iowa.An annual snowfall of 32.3 inches in Sioux City means that it is snowier than most places in Iowa.

December is the snowiest month in Waterloo with 9.6 inches of snow, and 6 months of the year have significant snowfall.December is the snowiest month in Sioux City with 7.3 inches of snow, and 6 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Waterloo 2 Reviews

Reviews for Sioux City 2 Reviews

Most Recent Searches On Compare Climate & Weather

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Zips In Waterloo, Iowa

Zips In SIOUX CITY, IOWA

Learn More About WATERLOO, IOWA

Learn More About Sioux City, Iowa

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2025 Compare Climate & Weather:
Waterloo, IA vs Sioux City, IA

January has the coldest nighttime temperatures for Waterloo with an average of 8.4°. This is colder than most places in Iowa.

January has the coldest nighttime temperatures for Sioux City with an average of 9.6°. This is about average compared to other places in Iowa.

In Waterloo, there are 11.5 days annually when the high temperature is over 90°, which is cooler than most places in Iowa.

In Sioux City, there are 19.8 days annually when the high temperature is over 90°, which is one of the hottest places in Iowa.

In Waterloo, there are 21.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Iowa.

In Sioux City, there are 18.9 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Iowa.

An annual snowfall of 33.9 inches in Waterloo means that it is snowier than most places in Iowa.

An annual snowfall of 32.3 inches in Sioux City means that it is snowier than most places in Iowa.

December is the snowiest month in Waterloo with 9.6 inches of snow, and 6 months of the year have significant snowfall.

December is the snowiest month in Sioux City with 7.3 inches of snow, and 6 months of the year have significant snowfall.