2025 Compare Climate & Weather:
Rapid City, SD vs Longmont, CO

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Highlights

On average, there are 247 sunny days per year in Longmont. Rapid City averages 226 sunny days per year. The US average is 205 sunny days.

Longmont, Colorado gets 14.8 inches of rain, on average, per year. Rapid City, South Dakota gets 18.2 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Longmont averages 36.4 inches of snow per year. Rapid City averages 38 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Longmont, Colorado
Summer High: the July high is around 89.1 degrees
Winter Low: the January low is 12.5
Rain: averages 14.8 inches of rain a year
Snow: averages 36.4 inches of snow a year

Rapid City, South Dakota
Summer High: the July high is around 85.3 degrees
Winter Low: the January low is 14.2
Rain: averages 18.2 inches of rain a year
Snow: averages 38 inches of snow a year

BestPlaces Comfort Index

Longmont

The annual BestPlaces Comfort Index for Longmont is 7.2 (10=best), which means it is more comfortable than most places in Colorado.

7.2 / 10

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

Rapid City

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

7 / 10

August, July and June are the most pleasant months in Rapid City, while February and January are the least comfortable months.

Average Monthly High / Low (°F)

Month	Rapid City, SD	Longmont, CO
January	38° / 14°	44° / 13°
February	39° / 16°	47° / 16°
March	47° / 23°	55° / 23°
April	57° / 32°	63° / 31°
May	67° / 43°	72° / 41°
June	76° / 52°	83° / 49°
July	85° / 59°	89° / 55°
August	85° / 58°	87° / 53°
September	74° / 47°	79° / 43°
October	60° / 35°	66° / 32°
November	47° / 24°	53° / 21°
December	37° / 15°	44° / 12°

Hot, Freezing, Rainy, Snowy Days: Rapid City / Longmont

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	29 / 31	4 / 4	5 / 3
February	0 / 0	26 / 27	5 / 5	5 / 3
March	0 / 0	25 / 27	6 / 6	4 / 3
April	0 / 0	15 / 16	9 / 8	3 / 2
May	0 / 1	3 / 3	11 / 10	0 / 0
June	2 / 7	0 / 0	12 / 9	0 / 0
July	9 / 16	0 / 0	9 / 8	0 / 0
August	8 / 11	0 / 0	8 / 8	0 / 0
September	2 / 3	1 / 2	6 / 7	0 / 0
October	0 / 0	10 / 15	7 / 6	1 / 1
November	0 / 0	23 / 27	4 / 6	3 / 3
December	0 / 0	29 / 31	4 / 4	4 / 3

July is the hottest month for Rapid City with an average high temperature of 85.3°, which ranks it as about average compared to other places in South Dakota. In Rapid City, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rapid City are June, September and August.

July is the hottest month for Longmont with an average high temperature of 89.1°, which ranks it as warmer than most places in Colorado. In Longmont, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Longmont are September, June and May.

January has the coldest nighttime temperatures for Rapid City with an average of 14.2°. This is one of the warmest places in South Dakota.

December has the coldest nighttime temperatures for Longmont with an average of 12.2°. This is colder than most places in Colorado.

In Rapid City, there are 22.5 days annually when the high temperature is over 90°, which is about average compared to other places in South Dakota.

In Longmont, there are 37.5 days annually when the high temperature is over 90°, which is hotter than most places in Colorado.

In Rapid City, there are 159.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in South Dakota.

In Longmont, there are 178.8 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Colorado.

In Rapid City, there are 14.9 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.

In Longmont, there are 11.2 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Colorado.

May is the wettest month in Rapid City with 3.8 inches of rain, and the driest month is January with 0.3 inches. The wettest season is Autumn with 38% of yearly precipitation and 6% occurs in Spring, which is the driest season. The annual rainfall of 18.2 inches in Rapid City means that it is drier than most places in South Dakota.

May is the wettest month in Longmont with 2.3 inches of rain, and the driest month is February with 0.4 inches. The wettest season is Summer with 38% of yearly precipitation and 10% occurs in Spring, which is the driest season. The annual rainfall of 14.8 inches in Longmont means that it is drier than most places in Colorado.

June is the rainiest month in Rapid City with 11.8 days of rain, and November is the driest month with only 4.0 rainy days. There are 85.4 rainy days annually in Rapid City, which is rainier than most places in South Dakota. The rainiest season is Autumn when it rains 34% of the time and the driest is Spring with only a 15% chance of a rainy day.

May is the rainiest month in Longmont with 9.8 days of rain, and January is the driest month with only 4.2 rainy days. There are 79.2 rainy days annually in Longmont, which is about average compared to other places in Colorado. The rainiest season is Summer when it rains 31% of the time and the driest is Spring with only a 17% chance of a rainy day.

An annual snowfall of 38.0 inches in Rapid City means that it is about average compared to other places in South Dakota.

An annual snowfall of 36.4 inches in Longmont means that it is less snowy than most places in Colorado.

March is the snowiest month in Rapid City with 8.6 inches of snow, and 8 months of the year have significant snowfall.

March is the snowiest month in Longmont with 7.3 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 Rapid 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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Reviews for Longmont 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 Longmont

See all reviews

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2025 Compare Climate & Weather:
Rapid City, SD vs Longmont, CO

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Rapid City / Longmont

January has the coldest nighttime temperatures for Rapid City with an average of 14.2°. This is one of the warmest places in South Dakota.

December has the coldest nighttime temperatures for Longmont with an average of 12.2°. This is colder than most places in Colorado.

In Rapid City, there are 22.5 days annually when the high temperature is over 90°, which is about average compared to other places in South Dakota.

In Longmont, there are 37.5 days annually when the high temperature is over 90°, which is hotter than most places in Colorado.

In Rapid City, there are 159.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in South Dakota.

In Longmont, there are 178.8 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Colorado.

In Rapid City, there are 14.9 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.

In Longmont, there are 11.2 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Colorado.

An annual snowfall of 38.0 inches in Rapid City means that it is about average compared to other places in South Dakota.

An annual snowfall of 36.4 inches in Longmont means that it is less snowy than most places in Colorado.

March is the snowiest month in Rapid City with 8.6 inches of snow, and 8 months of the year have significant snowfall.

March is the snowiest month in Longmont with 7.3 inches of snow, and 7 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Rapid City 2 Reviews

Reviews for Longmont 2 Reviews

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2025 Compare Climate & Weather:Rapid City, SD vs Longmont, CO

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Rapid City / Longmont

January has the coldest nighttime temperatures for Rapid City with an average of 14.2°. This is one of the warmest places in South Dakota.December has the coldest nighttime temperatures for Longmont with an average of 12.2°. This is colder than most places in Colorado.

In Rapid City, there are 22.5 days annually when the high temperature is over 90°, which is about average compared to other places in South Dakota.In Longmont, there are 37.5 days annually when the high temperature is over 90°, which is hotter than most places in Colorado.

In Rapid City, there are 159.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in South Dakota.In Longmont, there are 178.8 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Colorado.

In Rapid City, there are 14.9 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.In Longmont, there are 11.2 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Colorado.

An annual snowfall of 38.0 inches in Rapid City means that it is about average compared to other places in South Dakota.An annual snowfall of 36.4 inches in Longmont means that it is less snowy than most places in Colorado.

March is the snowiest month in Rapid City with 8.6 inches of snow, and 8 months of the year have significant snowfall.March is the snowiest month in Longmont with 7.3 inches of snow, and 7 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Rapid City 2 Reviews

Reviews for Longmont 2 Reviews

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2025 Compare Climate & Weather:
Rapid City, SD vs Longmont, CO

January has the coldest nighttime temperatures for Rapid City with an average of 14.2°. This is one of the warmest places in South Dakota.

December has the coldest nighttime temperatures for Longmont with an average of 12.2°. This is colder than most places in Colorado.

In Rapid City, there are 22.5 days annually when the high temperature is over 90°, which is about average compared to other places in South Dakota.

In Longmont, there are 37.5 days annually when the high temperature is over 90°, which is hotter than most places in Colorado.

In Rapid City, there are 159.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in South Dakota.

In Longmont, there are 178.8 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Colorado.

In Rapid City, there are 14.9 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.

In Longmont, there are 11.2 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Colorado.

An annual snowfall of 38.0 inches in Rapid City means that it is about average compared to other places in South Dakota.

An annual snowfall of 36.4 inches in Longmont means that it is less snowy than most places in Colorado.

March is the snowiest month in Rapid City with 8.6 inches of snow, and 8 months of the year have significant snowfall.

March is the snowiest month in Longmont with 7.3 inches of snow, and 7 months of the year have significant snowfall.