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

Highlights

On average, there are 226 sunny days per year in Rapid City. Grand Junction averages 245 sunny days per year. The US average is 205 sunny days.

Rapid City, South Dakota gets 18.2 inches of rain, on average, per year. Grand Junction, Colorado gets 9.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Rapid City averages 38 inches of snow per year. Grand Junction averages 15.8 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Grand Junction, Colorado
Summer High: the July high is around 92.8 degrees
Winter Low: the January low is 17.8
Rain: averages 9.9 inches of rain a year
Snow: averages 15.8 inches of snow a year

BestPlaces Comfort Index

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.

The annual BestPlaces Comfort Index for Grand Junction is 7.4 (10=best), which means it is one of the most pleasant places in Colorado.

Today's Weather - Grand Junction, CO

55°F

Today's Weather - Rapid City, SD

54°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Grand Junction / Rapid City

July is the hottest month for Grand Junction with an average high temperature of 92.8°, which ranks it as one of the hottest places in Colorado. In Grand Junction, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Grand Junction are May, September and June.

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.

January has the coldest nighttime temperatures for Grand Junction with an average of 17.8°. This is warmer than most places in Colorado.

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.

In Grand Junction, there are 54.9 days annually when the high temperature is over 90°, which is one of the hottest 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 Grand Junction, there are 130.1 days annually when the nighttime low temperature falls below freezing, which is one of the warmest 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 Grand Junction, there are 2.1 days annually when the nighttime low temperature falls below zero°, which is one of the warmest 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.

September is the wettest month in Grand Junction with 1.2 inches of rain, and the driest month is January with 0.5 inches. The wettest season is Winter with 32% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 9.9 inches in Grand Junction means that it is one of the driest 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.

April is the rainiest month in Grand Junction with 6.9 days of rain, and June is the driest month with only 3.8 rainy days. There are 68.9 rainy days annually in Grand Junction, which is less rainy than most places in Colorado. The rainiest season is Summer when it rains 28% of the time and the driest is Spring with only a 22% chance of a rainy day.

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.

An annual snowfall of 15.8 inches in Grand Junction means that it is one of the least snowy 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.

December is the snowiest month in Grand Junction with 4.3 inches of snow, and 6 months of the year have significant snowfall.

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