2025 Compare Climate & Weather:
Preston, ID vs Rock Springs, WY

Highlights

On average, there are 238 sunny days per year in Rock Springs. Preston averages 206 sunny days per year. The US average is 205 sunny days.

Rock Springs, Wyoming gets 8.9 inches of rain, on average, per year. Preston, Idaho gets 18.5 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Rock Springs averages 40.6 inches of snow per year. Preston averages 60 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Rock Springs, Wyoming
Summer High: the July high is around 85.8 degrees
Winter Low: the January low is 10.1
Rain: averages 8.9 inches of rain a year
Snow: averages 40.6 inches of snow a year

Preston, Idaho
Summer High: the July high is around 88.7 degrees
Winter Low: the January low is 13.9
Rain: averages 18.5 inches of rain a year
Snow: averages 60 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Rock Springs is 6.8 (10=best), which means it is more comfortable than most places in Wyoming.

The annual BestPlaces Comfort Index for Preston is 6.6 (10=best), which means it is about average compared to other places in Idaho.

Today's Weather - Preston, ID

51°F

Today's Weather - Rock Springs, WY

60°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Preston / Rock Springs

July is the hottest month for Preston with an average high temperature of 88.7°, which ranks it as warmer than most places in Idaho. In Preston, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Preston are September, June and May.

July is the hottest month for Rock Springs with an average high temperature of 85.8°, which ranks it as about average compared to other places in Wyoming. In Rock Springs, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rock Springs are June, September and August.

January has the coldest nighttime temperatures for Preston with an average of 13.9°. This is colder than most places in Idaho.

January has the coldest nighttime temperatures for Rock Springs with an average of 10.1°. This is about average compared to other places in Wyoming.

In Preston, there are 29.8 days annually when the high temperature is over 90°, which is hotter than most places in Idaho.

In Rock Springs, there are 14.2 days annually when the high temperature is over 90°, which is about average compared to other places in Wyoming.

In Preston, there are 169.0 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Idaho.

In Rock Springs, there are 186.1 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Wyoming.

In Preston, there are 9.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Idaho.

In Rock Springs, there are 15.3 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Wyoming.

May is the wettest month in Preston with 2.3 inches of rain, and the driest month is July with 0.8 inches. The wettest season is Summer with 33% of yearly precipitation and 16% occurs in Autumn, which is the driest season. The annual rainfall of 18.5 inches in Preston means that it is about average compared to other places in Idaho.


May is the wettest month in Rock Springs with 1.3 inches of rain, and the driest month is January with 0.4 inches. The wettest season is Summer with 32% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 8.9 inches in Rock Springs means that it is drier than most places in Wyoming.

May is the rainiest month in Preston with 10.8 days of rain, and July is the driest month with only 4.5 rainy days. There are 98.8 rainy days annually in Preston, which is about average compared to other places in Idaho. The rainiest season is Summer when it rains 31% of the time and the driest is Autumn with only a 16% chance of a rainy day.

May is the rainiest month in Rock Springs with 7.9 days of rain, and February is the driest month with only 5.1 rainy days. There are 72.1 rainy days annually in Rock Springs, which is about average compared to other places in Wyoming. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 22% chance of a rainy day.

An annual snowfall of 60.0 inches in Preston means that it is snowier than most places in Idaho.

An annual snowfall of 40.6 inches in Rock Springs means that it is less snowy than most places in Wyoming.

December is the snowiest month in Preston with 16.3 inches of snow, and 7 months of the year have significant snowfall.

February is the snowiest month in Rock Springs with 7.1 inches of snow, and 8 months of the year have significant snowfall.