2025 Compare Climate & Weather:
Charleston, SC vs Sister Bay, WI

Highlights

On average, there are 189 sunny days per year in Sister Bay. Charleston averages 209 sunny days per year. The US average is 205 sunny days.

Sister Bay, Wisconsin gets 30.3 inches of rain, on average, per year. Charleston, South Carolina gets 48.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Sister Bay averages 47.6 inches of snow per year. Charleston averages 0.4 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Sister Bay, Wisconsin
Summer High: the July high is around 77.9 degrees
Winter Low: the January low is 11.2
Rain: averages 30.3 inches of rain a year
Snow: averages 47.6 inches of snow a year

Charleston, South Carolina
Summer High: the July high is around 89.9 degrees
Winter Low: the January low is 39.3
Rain: averages 48.3 inches of rain a year
Snow: averages 0.4 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Charleston is 7.2 (10=best), which means it is less comfortable than most places in South Carolina.

Today's Weather - Charleston, SC

69°F

Today's Weather - Sister Bay, WI

43°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Charleston / Sister Bay

July is the hottest month for Charleston with an average high temperature of 89.9°, which ranks it as cooler than most places in South Carolina. In Charleston, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Charleston are October, May and April.

July is the hottest month for Sister Bay with an average high temperature of 77.9°, which ranks it as one of the coolest places in Wisconsin. In Sister Bay, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sister Bay are July, August and June.

January has the coldest nighttime temperatures for Charleston with an average of 39.3°. This is one of the warmest places in South Carolina.

January has the coldest nighttime temperatures for Sister Bay with an average of 11.2°. This is warmer than most places in Wisconsin.

In Charleston, there are 41.1 days annually when the high temperature is over 90°, which is cooler than most places in South Carolina.

In Sister Bay, there are 0.8 days annually when the high temperature is over 90°, which is one of the coolest places in Wisconsin.

In Charleston, there are 17.5 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in South Carolina.

In Sister Bay, there are 149.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Wisconsin.

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

In Sister Bay, there are 10.0 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Wisconsin.

August is the wettest month in Charleston with 6.7 inches of rain, and the driest month is May with 2.5 inches. The wettest season is Autumn with 36% of yearly precipitation and 19% occurs in Summer, which is the driest season. The annual rainfall of 48.3 inches in Charleston means that it is wetter than most places in South Carolina.


June is the wettest month in Sister Bay with 3.5 inches of rain, and the driest month is February with 1.1 inches. The wettest season is Autumn with 32% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 30.3 inches in Sister Bay means that it is one of the driest places in Wisconsin.

August is the rainiest month in Charleston with 11.7 days of rain, and May is the driest month with only 6.8 rainy days. There are 105.9 rainy days annually in Charleston, which is rainier than most places in South Carolina. The rainiest season is Autumn when it rains 32% of the time and the driest is Summer with only a 21% chance of a rainy day.

October is the rainiest month in Sister Bay with 10.7 days of rain, and February is the driest month with only 6.8 rainy days. There are 112.9 rainy days annually in Sister Bay, which is about average compared to other places in Wisconsin. The rainiest season is Winter when it rains 27% of the time and the driest is Spring with only a 22% chance of a rainy day.

An annual snowfall of 0.4 inches in Charleston means that it is less snowy than most places in South Carolina.

An annual snowfall of 47.6 inches in Sister Bay means that it is snowier than most places in Wisconsin.

December is the snowiest month in Charleston with 0.2 inches of snow, and no months of the year have significant snowfall.

January is the snowiest month in Sister Bay with 13.3 inches of snow, and 6 months of the year have significant snowfall.