2025 Compare Climate & Weather:
Spearfish, SD vs Plummer, ID

Highlights

On average, there are 172 sunny days per year in Plummer. Spearfish averages 227 sunny days per year. The US average is 205 sunny days.

Plummer, Idaho gets 24.7 inches of rain, on average, per year. Spearfish, South Dakota gets 21.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Plummer averages 41.4 inches of snow per year. Spearfish averages 56.4 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Plummer, Idaho
Summer High: the July high is around 82.1 degrees
Winter Low: the January low is 24
Rain: averages 24.7 inches of rain a year
Snow: averages 41.4 inches of snow a year

Spearfish, South Dakota
Summer High: the July high is around 87.6 degrees
Winter Low: the January low is 17
Rain: averages 21.3 inches of rain a year
Snow: averages 56.4 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Spearfish is 6.9 (10=best), which means it is more comfortable than most places in South Dakota.

Today's Weather - Spearfish, SD

88°F

Today's Weather - Plummer, ID

53°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Spearfish / Plummer

July is the hottest month for Spearfish with an average high temperature of 87.6°, which ranks it as warmer than most places in South Dakota. In Spearfish, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Spearfish are June, September and August.

August is the hottest month for Plummer with an average high temperature of 82.6°, which ranks it as cooler than most places in Idaho. In Plummer, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Plummer are July, August and September.

January has the coldest nighttime temperatures for Spearfish with an average of 17.0°. This is one of the warmest places in South Dakota.

December has the coldest nighttime temperatures for Plummer with an average of 22.1°. This is warmer than most places in Idaho.

In Spearfish, there are 31.3 days annually when the high temperature is over 90°, which is hotter than most places in South Dakota.

In Plummer, there are 15.0 days annually when the high temperature is over 90°, which is about average compared to other places in Idaho.

In Spearfish, there are 144.6 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in South Dakota.

In Plummer, there are 148.8 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Idaho.

In Spearfish, there are 12.9 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.

In Plummer, there are 2.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Idaho.

May is the wettest month in Spearfish with 3.6 inches of rain, and the driest month is January with 0.6 inches. The wettest season is Summer with 34% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 21.3 inches in Spearfish means that it is drier than most places in South Dakota.


November is the wettest month in Plummer with 3.3 inches of rain, and the driest month is August with 0.8 inches. The wettest season is Spring with 33% of yearly precipitation and 14% occurs in Autumn, which is the driest season. The annual rainfall of 24.7 inches in Plummer means that it is wetter than most places in Idaho.

June is the rainiest month in Spearfish with 11.7 days of rain, and February is the driest month with only 5.5 rainy days. There are 90.3 rainy days annually in Spearfish, which is one of the rainiest places in South Dakota. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 19% chance of a rainy day.

November is the rainiest month in Plummer with 13.3 days of rain, and August is the driest month with only 3.6 rainy days. There are 107.8 rainy days annually in Plummer, which is rainier than most places in Idaho. The rainiest season is Spring when it rains 31% of the time and the driest is Autumn with only a 16% chance of a rainy day.

An annual snowfall of 56.4 inches in Spearfish means that it is one of the snowiest places in South Dakota.

An annual snowfall of 41.4 inches in Plummer means that it is about average compared to other places in Idaho.

March is the snowiest month in Spearfish with 10.8 inches of snow, and 8 months of the year have significant snowfall.

December is the snowiest month in Plummer with 14.2 inches of snow, and 6 months of the year have significant snowfall.