2025 Compare Climate & Weather:
Des Moines, IA vs Roy, MT

Highlights

On average, there are 196 sunny days per year in Roy. Des Moines averages 204 sunny days per year. The US average is 205 sunny days.

Roy, Montana gets 15.2 inches of rain, on average, per year. Des Moines, Iowa gets 35.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Roy averages 39.4 inches of snow per year. Des Moines averages 32.9 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Roy, Montana
Summer High: the July high is around 84.2 degrees
Winter Low: the January low is 11.1
Rain: averages 15.2 inches of rain a year
Snow: averages 39.4 inches of snow a year

Des Moines, Iowa
Summer High: the July high is around 85.6 degrees
Winter Low: the January low is 12.5
Rain: averages 35.9 inches of rain a year
Snow: averages 32.9 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Roy is 6.9 (10=best), which means it is one of the most pleasant places in Montana.

The annual BestPlaces Comfort Index for Des Moines is 6.9 (10=best), which means it is more comfortable than most places in Iowa.

Today's Weather - Des Moines, IA

79°F

Today's Weather - Roy, MT

71°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Des Moines / Roy

July is the hottest month for Des Moines with an average high temperature of 85.6°, which ranks it as warmer than most places in Iowa. In Des Moines, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Des Moines are September, June and May.

July is the hottest month for Roy with an average high temperature of 84.2°, which ranks it as about average compared to other places in Montana. In Roy, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Roy are June, September and August.

January has the coldest nighttime temperatures for Des Moines with an average of 12.5°. This is warmer than most places in Iowa.

January has the coldest nighttime temperatures for Roy with an average of 11.1°. This is colder than most places in Montana.

In Des Moines, there are 18.8 days annually when the high temperature is over 90°, which is hotter than most places in Iowa.

In Roy, there are 20.8 days annually when the high temperature is over 90°, which is hotter than most places in Montana.

In Des Moines, there are 135.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Iowa.

In Roy, there are 173.5 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Montana.

In Des Moines, there are 13.6 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Iowa.

In Roy, there are 23.1 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Montana.

June is the wettest month in Des Moines with 5.1 inches of rain, and the driest month is January with 1.0 inches. The wettest season is Autumn with 39% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 35.9 inches in Des Moines means that it is about average compared to other places in Iowa.


May is the wettest month in Roy with 2.9 inches of rain, and the driest month is February with 0.3 inches. The wettest season is Autumn with 40% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 15.2 inches in Roy means that it is wetter than most places in Montana.

May is the rainiest month in Des Moines with 12.3 days of rain, and January is the driest month with only 6.8 rainy days. There are 107.6 rainy days annually in Des Moines, 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.

June is the rainiest month in Roy with 10.6 days of rain, and February is the driest month with only 3.7 rainy days. There are 75.2 rainy days annually in Roy, which is less rainy than most places in Montana. The rainiest season is Autumn when it rains 33% of the time and the driest is Spring with only a 17% chance of a rainy day.

An annual snowfall of 32.9 inches in Des Moines means that it is snowier than most places in Iowa.

An annual snowfall of 39.4 inches in Roy means that it is about average compared to other places in Montana.

January is the snowiest month in Des Moines with 8.2 inches of snow, and 6 months of the year have significant snowfall.

March is the snowiest month in Roy with 7.5 inches of snow, and 8 months of the year have significant snowfall.