2025 Compare Climate & Weather:
Kelso, WA vs Custer, SD

Highlights

On average, there are 226 sunny days per year in Custer. Kelso averages 142 sunny days per year. The US average is 205 sunny days.

Custer, South Dakota gets 19.9 inches of rain, on average, per year. Kelso, Washington gets 60.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Custer averages 55.3 inches of snow per year. Kelso averages 3.8 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Custer, South Dakota
Summer High: the July high is around 79.5 degrees
Winter Low: the January low is 15.5
Rain: averages 19.9 inches of rain a year
Snow: averages 55.3 inches of snow a year

Kelso, Washington
Summer High: the July high is around 76.9 degrees
Winter Low: the January low is 33.8
Rain: averages 60.4 inches of rain a year
Snow: averages 3.8 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Custer is 6.7 (10=best), which means it is less comfortable than most places in South Dakota.

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

Today's Weather - Kelso, WA

46°F

Today's Weather - Custer, SD

42°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Kelso / Custer

August is the hottest month for Kelso with an average high temperature of 78.1°, which ranks it as about average compared to other places in Washington. In Kelso, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Kelso are August, July and September.

July is the hottest month for Custer with an average high temperature of 79.5°, which ranks it as one of the coolest places in South Dakota. In Custer, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Custer are August, July and June.

December has the coldest nighttime temperatures for Kelso with an average of 33.1°. This is about average compared to other places in Washington.

December has the coldest nighttime temperatures for Custer with an average of 15.2°. This is one of the warmest places in South Dakota.

In Kelso, there are 6.4 days annually when the high temperature is over 90°, which is about average compared to other places in Washington.

In Custer, there are 4.7 days annually when the high temperature is over 90°, which is one of the coolest places in South Dakota.

In Kelso, there are 52.5 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Washington.

In Custer, there are 177.0 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in South Dakota.

In Kelso, 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 Custer, there are 12.6 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.

November is the wettest month in Kelso with 9.6 inches of rain, and the driest month is July with 0.9 inches. The wettest season is Spring with 39% of yearly precipitation and 8% occurs in Autumn, which is the driest season. The annual rainfall of 60.4 inches in Kelso means that it is wetter than most places in Washington.


May is the wettest month in Custer with 3.6 inches of rain, and the driest month is January with 0.3 inches. The wettest season is Autumn with 40% of yearly precipitation and 7% occurs in Spring, which is the driest season. The annual rainfall of 19.9 inches in Custer means that it is drier than most places in South Dakota.

November is the rainiest month in Kelso with 21.6 days of rain, and August is the driest month with only 5.1 rainy days. There are 179.7 rainy days annually in Kelso, which is rainier than most places in Washington. The rainiest season is Spring when it rains 33% of the time and the driest is Autumn with only a 12% chance of a rainy day.

May is the rainiest month in Custer with 12.8 days of rain, and January is the driest month with only 3.9 rainy days. There are 93.0 rainy days annually in Custer, which is one of the rainiest places in South Dakota. The rainiest season is Autumn when it rains 36% of the time and the driest is Spring with only a 14% chance of a rainy day.

An annual snowfall of 3.8 inches in Kelso means that it is less snowy than most places in Washington.

An annual snowfall of 55.3 inches in Custer means that it is one of the snowiest places in South Dakota.

February is the snowiest month in Kelso with 1.4 inches of snow, and 3 months of the year have significant snowfall.

April is the snowiest month in Custer with 11.5 inches of snow, and 9 months of the year have significant snowfall.