2025 Compare Climate & Weather:
Plains, MT vs Idaho Falls, ID

Highlights

On average, there are 201 sunny days per year in Idaho Falls. Plains averages 154 sunny days per year. The US average is 205 sunny days.

Idaho Falls, Idaho gets 12.2 inches of rain, on average, per year. Plains, Montana gets 18.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Idaho Falls averages 38.9 inches of snow per year. Plains averages 39.4 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Idaho Falls, Idaho
Summer High: the July high is around 86.2 degrees
Winter Low: the January low is 12.9
Rain: averages 12.2 inches of rain a year
Snow: averages 38.9 inches of snow a year

Plains, Montana
Summer High: the July high is around 86 degrees
Winter Low: the January low is 20.9
Rain: averages 18.9 inches of rain a year
Snow: averages 39.4 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Idaho Falls is 6.7 (10=best), which means it is more comfortable than most places in Idaho.

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

Today's Weather - Plains, MT

46°F

Today's Weather - Idaho Falls, ID

41°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Plains / Idaho Falls

July is the hottest month for Plains with an average high temperature of 86.0°, which ranks it as warmer than most places in Montana. In Plains, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Plains are June, September and August.

July is the hottest month for Idaho Falls with an average high temperature of 86.2°, which ranks it as warmer than most places in Idaho. In Idaho Falls, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Idaho Falls are June, September and August.

December has the coldest nighttime temperatures for Plains with an average of 19.4°. This is warmer than most places in Montana.

January has the coldest nighttime temperatures for Idaho Falls with an average of 12.9°. This is colder than most places in Idaho.

In Plains, there are 26.5 days annually when the high temperature is over 90°, which is hotter than most places in Montana.

In Idaho Falls, there are 20.2 days annually when the high temperature is over 90°, which is about average compared to other places in Idaho.

In Plains, there are 164.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Montana.

In Idaho Falls, there are 172.4 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Idaho.

In Plains, there are 5.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Montana.

In Idaho Falls, there are 10.7 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Idaho.

November is the wettest month in Plains with 2.3 inches of rain, and the driest month is July with 1.0 inches. The wettest season is Winter with 27% of yearly precipitation and 22% occurs in Autumn, which is the driest season. The annual rainfall of 18.9 inches in Plains means that it is wetter than most places in Montana.


May is the wettest month in Idaho Falls with 1.7 inches of rain, and the driest month is July with 0.6 inches. The wettest season is Summer with 34% of yearly precipitation and 20% occurs in Autumn, which is the driest season. The annual rainfall of 12.2 inches in Idaho Falls means that it is drier than most places in Idaho.

November is the rainiest month in Plains with 14.3 days of rain, and August is the driest month with only 6.3 rainy days. There are 129.5 rainy days annually in Plains, 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 19% chance of a rainy day.

January is the rainiest month in Idaho Falls with 10.5 days of rain, and July is the driest month with only 4.6 rainy days. There are 93.3 rainy days annually in Idaho Falls, which is about average compared to other places in Idaho. The rainiest season is Spring when it rains 32% of the time and the driest is Autumn with only a 19% chance of a rainy day.

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

An annual snowfall of 38.9 inches in Idaho Falls means that it is less snowy than most places in Idaho.

December is the snowiest month in Plains with 13.0 inches of snow, and 6 months of the year have significant snowfall.

December is the snowiest month in Idaho Falls with 10.9 inches of snow, and 7 months of the year have significant snowfall.