2025 Compare Climate & Weather:
Troy, MT vs Roundup, MT

Highlights

On average, there are 198 sunny days per year in Roundup. Troy averages 150 sunny days per year. The US average is 205 sunny days.

Roundup, Montana gets 14.1 inches of rain, on average, per year. Troy, Montana gets 22 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Roundup averages 32.9 inches of snow per year. Troy averages 44.4 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Roundup, Montana
Summer High: the July high is around 88.1 degrees
Winter Low: the January low is 13
Rain: averages 14.1 inches of rain a year
Snow: averages 32.9 inches of snow a year

Troy, Montana
Summer High: the July high is around 84.3 degrees
Winter Low: the January low is 20.6
Rain: averages 22 inches of rain a year
Snow: averages 44.4 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Troy is 6.5 (10=best), which means it is less comfortable than most places in Montana.

Today's Weather - Troy, MT

53°F

Today's Weather - Roundup, MT

59°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Troy / Roundup

August is the hottest month for Troy with an average high temperature of 84.7°, which ranks it as about average compared to other places in Montana. In Troy, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Troy are June, September and July.

July is the hottest month for Roundup with an average high temperature of 88.1°, which ranks it as one of the hottest places in Montana. In Roundup, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Roundup are June, September and May.

December has the coldest nighttime temperatures for Troy with an average of 20.3°. This is one of the warmest places in Montana.

January has the coldest nighttime temperatures for Roundup with an average of 13.0°. This is about average compared to other places in Montana.

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

In Roundup, there are 33.7 days annually when the high temperature is over 90°, which is one of the hottest places in Montana.

In Troy, there are 161.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Montana.

In Roundup, there are 172.8 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Montana.

In Troy, there are 4.7 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Montana.

In Roundup, there are 17.5 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Montana.

November is the wettest month in Troy with 3.1 inches of rain, and the driest month is August with 1.0 inches. The wettest season is Spring with 29% of yearly precipitation and 20% occurs in Autumn, which is the driest season. The annual rainfall of 22.0 inches in Troy means that it is one of the wettest places in Montana.


June is the wettest month in Roundup with 2.5 inches of rain, and the driest month is January with 0.4 inches. The wettest season is Autumn with 36% of yearly precipitation and 10% occurs in Spring, which is the driest season. The annual rainfall of 14.1 inches in Roundup means that it is about average compared to other places in Montana.

November is the rainiest month in Troy with 15.5 days of rain, and August is the driest month with only 6.2 rainy days. There are 132.4 rainy days annually in Troy, which is one of the rainiest places in Montana. The rainiest season is Spring when it rains 29% of the time and the driest is Autumn with only a 18% chance of a rainy day.

June is the rainiest month in Roundup with 10.3 days of rain, and November is the driest month with only 3.9 rainy days. There are 73.8 rainy days annually in Roundup, which is less rainy than most places in Montana. 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 44.4 inches in Troy means that it is about average compared to other places in Montana.

An annual snowfall of 32.9 inches in Roundup means that it is less snowy than most places in Montana.

December is the snowiest month in Troy with 16.2 inches of snow, and 6 months of the year have significant snowfall.

March is the snowiest month in Roundup with 6.6 inches of snow, and 8 months of the year have significant snowfall.