2025 Compare Climate & Weather:
Issaquah, WA vs Swan Lake, MT

Highlights

On average, there are 154 sunny days per year in Swan Lake. Issaquah averages 154 sunny days per year. The US average is 205 sunny days.

Swan Lake, Montana gets 23 inches of rain, on average, per year. Issaquah, Washington gets 52.6 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Swan Lake averages 55.2 inches of snow per year. Issaquah averages 6.2 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Swan Lake, Montana
Summer High: the July high is around 80 degrees
Winter Low: the January low is 19.3
Rain: averages 23 inches of rain a year
Snow: averages 55.2 inches of snow a year

Issaquah, Washington
Summer High: the July high is around 75.6 degrees
Winter Low: the January low is 35.3
Rain: averages 52.6 inches of rain a year
Snow: averages 6.2 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Swan Lake is 6.3 (10=best), which means it is less comfortable than most places in Montana.

The annual BestPlaces Comfort Index for Issaquah is 7.1 (10=best), which means it is about average compared to other places in Washington.

Today's Weather - Issaquah, WA

47°F

Today's Weather - Swan Lake, MT

51°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Issaquah / Swan Lake

August is the hottest month for Issaquah with an average high temperature of 76.1°, which ranks it as cooler than most places in Washington. In Issaquah, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Issaquah are August, July and September.

July is the hottest month for Swan Lake with an average high temperature of 80.0°, which ranks it as one of the coolest places in Montana. In Swan Lake, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Swan Lake are August, July and June.

December has the coldest nighttime temperatures for Issaquah with an average of 33.9°. This is warmer than most places in Washington.

December has the coldest nighttime temperatures for Swan Lake with an average of 19.1°. This is warmer than most places in Montana.

In Issaquah, there are 3.1 days annually when the high temperature is over 90°, which is about average compared to other places in Washington.

In Swan Lake, there are 6.3 days annually when the high temperature is over 90°, which is one of the coolest places in Montana.

In Issaquah, there are 43.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Washington.

In Swan Lake, there are 166.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Montana.

In Issaquah, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Washington.

In Swan Lake, there are 7.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Montana.

November is the wettest month in Issaquah with 8.6 inches of rain, and the driest month is July with 1.2 inches. The wettest season is Spring with 36% of yearly precipitation and 10% occurs in Autumn, which is the driest season. The annual rainfall of 52.6 inches in Issaquah means that it is wetter than most places in Washington.


June is the wettest month in Swan Lake with 3.1 inches of rain, and the driest month is August with 1.3 inches. The wettest season is Summer with 26% of yearly precipitation and 23% occurs in Spring, which is the driest season. The annual rainfall of 23.0 inches in Swan Lake means that it is one of the wettest places in Montana.

November is the rainiest month in Issaquah with 20.4 days of rain, and August is the driest month with only 5.7 rainy days. There are 173.4 rainy days annually in Issaquah, which is rainier than most places in Washington. The rainiest season is Spring when it rains 31% of the time and the driest is Autumn with only a 14% chance of a rainy day.

December is the rainiest month in Swan Lake with 12.4 days of rain, and August is the driest month with only 6.2 rainy days. There are 120.9 rainy days annually in Swan Lake, which is rainier than most places in Montana. The rainiest season is Spring when it rains 28% of the time and the driest is Autumn with only a 21% chance of a rainy day.

An annual snowfall of 6.2 inches in Issaquah means that it is about average compared to other places in Washington.

An annual snowfall of 55.2 inches in Swan Lake means that it is snowier than most places in Montana.

December is the snowiest month in Issaquah with 1.9 inches of snow, and 5 months of the year have significant snowfall.

December is the snowiest month in Swan Lake with 17.5 inches of snow, and 7 months of the year have significant snowfall.