2025 Compare Climate & Weather:
Star, ID vs Helena, MT

Highlights

On average, there are 189 sunny days per year in Helena. Star averages 210 sunny days per year. The US average is 205 sunny days.

Helena, Montana gets 12.6 inches of rain, on average, per year. Star, Idaho gets 11.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Helena averages 42.1 inches of snow per year. Star averages 9.5 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Helena, Montana
Summer High: the July high is around 83.4 degrees
Winter Low: the January low is 13.8
Rain: averages 12.6 inches of rain a year
Snow: averages 42.1 inches of snow a year

Star, Idaho
Summer High: the July high is around 92 degrees
Winter Low: the January low is 22.6
Rain: averages 11.9 inches of rain a year
Snow: averages 9.5 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Star is 7.3 (10=best), which means it is one of the most pleasant places in Idaho.

Today's Weather - Star, ID

58°F

Today's Weather - Helena, MT

48°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Star / Helena

July is the hottest month for Star with an average high temperature of 92.0°, which ranks it as one of the hottest places in Idaho. In Star, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Star are September, May and June.

July is the hottest month for Helena with an average high temperature of 83.4°, which ranks it as cooler than most places in Montana. In Helena, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Helena are June, August and July.

December has the coldest nighttime temperatures for Star with an average of 22.2°. This is warmer than most places in Idaho.

December has the coldest nighttime temperatures for Helena with an average of 13.6°. This is about average compared to other places in Montana.

In Star, there are 52.5 days annually when the high temperature is over 90°, which is one of the hottest places in Idaho.

In Helena, there are 15.5 days annually when the high temperature is over 90°, which is cooler than most places in Montana.

In Star, there are 125.3 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Idaho.

In Helena, there are 170.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Montana.

In Star, there are 2.6 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Idaho.

In Helena, there are 16.6 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Montana.

December is the wettest month in Star with 1.7 inches of rain, and the driest month is July with 0.3 inches. The wettest season is Spring with 35% of yearly precipitation and 11% occurs in Autumn, which is the driest season. The annual rainfall of 11.9 inches in Star means that it is drier than most places in Idaho.


June is the wettest month in Helena with 2.1 inches of rain, and the driest month is January with 0.4 inches. The wettest season is Autumn with 37% of yearly precipitation and 10% occurs in Spring, which is the driest season. The annual rainfall of 12.6 inches in Helena means that it is drier than most places in Montana.

November is the rainiest month in Star with 11.0 days of rain, and August is the driest month with only 2.3 rainy days. There are 85.3 rainy days annually in Star, which is less rainy than most places in Idaho. The rainiest season is Spring when it rains 35% of the time and the driest is Autumn with only a 12% chance of a rainy day.

May is the rainiest month in Helena with 11.0 days of rain, and February is the driest month with only 5.5 rainy days. There are 89.6 rainy days annually in Helena, which is about average compared to other places in Montana. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 21% chance of a rainy day.

An annual snowfall of 9.5 inches in Star means that it is one of the least snowy places in Idaho.

An annual snowfall of 42.1 inches in Helena means that it is about average compared to other places in Montana.

December is the snowiest month in Star with 4.0 inches of snow, and 4 months of the year have significant snowfall.

March is the snowiest month in Helena with 7.4 inches of snow, and 9 months of the year have significant snowfall.