2025 Compare Climate & Weather:
Grangeville, ID vs Thompson Falls, MT

Highlights

On average, there are 158 sunny days per year in Thompson Falls. Grangeville averages 169 sunny days per year. The US average is 205 sunny days.

Thompson Falls, Montana gets 22.7 inches of rain, on average, per year. Grangeville, Idaho gets 22.2 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Thompson Falls averages 42 inches of snow per year. Grangeville averages 40.7 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Thompson Falls, Montana
Summer High: the July high is around 86 degrees
Winter Low: the January low is 22.8
Rain: averages 22.7 inches of rain a year
Snow: averages 42 inches of snow a year

Grangeville, Idaho
Summer High: the July high is around 80.2 degrees
Winter Low: the January low is 23.7
Rain: averages 22.2 inches of rain a year
Snow: averages 40.7 inches of snow a year

BestPlaces Comfort Index

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

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

Today's Weather - Grangeville, ID

74°F

Today's Weather - Thompson Falls, MT

77°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Grangeville / Thompson Falls

August is the hottest month for Grangeville with an average high temperature of 81.1°, which ranks it as cooler than most places in Idaho. In Grangeville, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Grangeville are July, August and September.

August is the hottest month for Thompson Falls with an average high temperature of 86.3°, which ranks it as warmer than most places in Montana. In Thompson Falls, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Thompson Falls are June, September and July.

December has the coldest nighttime temperatures for Grangeville with an average of 21.9°. This is warmer than most places in Idaho.

December has the coldest nighttime temperatures for Thompson Falls with an average of 21.7°. This is one of the warmest places in Montana.

In Grangeville, there are 9.0 days annually when the high temperature is over 90°, which is cooler than most places in Idaho.

In Thompson Falls, there are 28.6 days annually when the high temperature is over 90°, which is hotter than most places in Montana.

In Grangeville, there are 143.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Idaho.

In Thompson Falls, there are 151.0 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Montana.

In Grangeville, there are 2.3 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Idaho.

In Thompson Falls, there are 3.6 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Montana.

May is the wettest month in Grangeville with 3.3 inches of rain, and the driest month is August with 1.1 inches. The wettest season is Summer with 36% of yearly precipitation and 19% occurs in Spring, which is the driest season. The annual rainfall of 22.2 inches in Grangeville means that it is wetter than most places in Idaho.


November is the wettest month in Thompson Falls with 2.9 inches of rain, and the driest month is July with 1.1 inches. The wettest season is Spring with 30% of yearly precipitation and 19% occurs in Autumn, which is the driest season. The annual rainfall of 22.7 inches in Thompson Falls means that it is one of the wettest places in Montana.

May is the rainiest month in Grangeville with 13.0 days of rain, and August is the driest month with only 5.3 rainy days. There are 115.3 rainy days annually in Grangeville, which is rainier than most places in Idaho. The rainiest season is Summer when it rains 33% of the time and the driest is Autumn with only a 19% chance of a rainy day.

November is the rainiest month in Thompson Falls with 15.8 days of rain, and August is the driest month with only 6.2 rainy days. There are 140.9 rainy days annually in Thompson Falls, which is one of the rainiest places in Montana. The rainiest season is Spring when it rains 30% of the time and the driest is Autumn with only a 18% chance of a rainy day.

An annual snowfall of 40.7 inches in Grangeville means that it is about average compared to other places in Idaho.

An annual snowfall of 42.0 inches in Thompson Falls means that it is about average compared to other places in Montana.

December is the snowiest month in Grangeville with 11.0 inches of snow, and 7 months of the year have significant snowfall.

December is the snowiest month in Thompson Falls with 15.0 inches of snow, and 5 months of the year have significant snowfall.