2025 Compare Climate & Weather:
Flagstaff, AZ vs Big Sky, MT

Highlights

On average, there are 187 sunny days per year in Big Sky. Flagstaff averages 266 sunny days per year. The US average is 205 sunny days.

Big Sky, Montana gets 20.2 inches of rain, on average, per year. Flagstaff, Arizona gets 20.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Big Sky averages 46.1 inches of snow per year. Flagstaff averages 81 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Big Sky, Montana
Summer High: the July high is around 77.9 degrees
Winter Low: the January low is 7.6
Rain: averages 20.2 inches of rain a year
Snow: averages 46.1 inches of snow a year

Flagstaff, Arizona
Summer High: the July high is around 81.7 degrees
Winter Low: the January low is 14.3
Rain: averages 20.7 inches of rain a year
Snow: averages 81 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Big Sky is 6.0 (10=best), which means it is one of the least comfortable places in Montana.

The annual BestPlaces Comfort Index for Flagstaff is 6.9 (10=best), which means it is one of the least comfortable places in Arizona.

Today's Weather - Flagstaff, AZ

75°F

Today's Weather - Big Sky, MT

72°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Flagstaff / Big Sky

July is the hottest month for Flagstaff with an average high temperature of 81.7°, which ranks it as one of the coolest places in Arizona. In Flagstaff, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Flagstaff are June, August and July.

July is the hottest month for Big Sky with an average high temperature of 77.9°, which ranks it as one of the coolest places in Montana. In Big Sky, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Big Sky are July, August and June.

January has the coldest nighttime temperatures for Flagstaff with an average of 14.3°. This is one of the coldest places in Arizona.

December has the coldest nighttime temperatures for Big Sky with an average of 6.5°. This is colder than most places in Montana.

In Flagstaff, there are 3.4 days annually when the high temperature is over 90°, which is one of the coolest places in Arizona.

In Big Sky, there are 1.6 days annually when the high temperature is over 90°, which is one of the coolest places in Montana.

In Flagstaff, there are 210.5 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Arizona.

In Big Sky, there are 253.5 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Montana.

In Flagstaff, there are 7.8 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Arizona.

In Big Sky, there are 28.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Montana.

August is the wettest month in Flagstaff with 3.3 inches of rain, and the driest month is June with 0.3 inches. The wettest season is Autumn with 29% of yearly precipitation and 17% occurs in Summer, which is the driest season. The annual rainfall of 20.7 inches in Flagstaff means that it is wetter than most places in Arizona.


June is the wettest month in Big Sky with 2.7 inches of rain, and the driest month is February with 1.0 inches. The wettest season is Autumn with 29% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 20.2 inches in Big Sky means that it is wetter than most places in Montana.

August is the rainiest month in Flagstaff with 13.8 days of rain, and June is the driest month with only 2.8 rainy days. There are 83.4 rainy days annually in Flagstaff, which is one of the rainiest places in Arizona. The rainiest season is Autumn when it rains 34% of the time and the driest is Summer with only a 20% chance of a rainy day.

May is the rainiest month in Big Sky with 12.7 days of rain, and October is the driest month with only 7.8 rainy days. There are 123.6 rainy days annually in Big Sky, which is one of the rainiest places in Montana. The rainiest season is Summer when it rains 27% of the time and the driest is Winter with only a 22% chance of a rainy day.

An annual snowfall of 81.0 inches in Flagstaff means that it is one of the snowiest places in Arizona.

An annual snowfall of 46.1 inches in Big Sky means that it is snowier than most places in Montana.

January is the snowiest month in Flagstaff with 19.1 inches of snow, and 8 months of the year have significant snowfall.

January is the snowiest month in Big Sky with 8.6 inches of snow, and 8 months of the year have significant snowfall.