2024 Compare Climate & Weather:
Spearfish, SD vs Castle Rock, CO
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Highlights
On average, there are 243 sunny days per year in Castle Rock. Spearfish averages 227 sunny days per year. The US average is 205 sunny days.
Castle Rock, Colorado gets 18.6 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.
Castle Rock averages 78.3 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
Castle Rock, Colorado
Summer High: the July high is around 85.5 degrees
Winter Low: the January low is 18.6
Rain: averages 18.6 inches of rain a year
Snow: averages 78.3 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
Castle RockThe annual BestPlaces Comfort Index for Castle Rock is 7.2 (10=best), which means it is more comfortable than most places in Colorado.
7.2 / 10
August, September and July are the most pleasant months in Castle Rock, while December and January are the least comfortable months.
SpearfishThe annual BestPlaces Comfort Index for Spearfish is 6.9 (10=best), which means it is more comfortable than most places in South Dakota.
6.9 / 10
June, September and August are the most pleasant months in Spearfish, while January and February are the least comfortable months.
Average Monthly High / Low (°F)
| Month | Spearfish, SD | Castle Rock, CO |
|---|
| January | 39° / 17° | 45° / 19° |
| February | 41° / 18° | 46° / 20° |
| March | 49° / 25° | 53° / 26° |
| April | 59° / 34° | 60° / 32° |
| May | 68° / 44° | 69° / 41° |
| June | 78° / 53° | 79° / 50° |
| July | 88° / 60° | 86° / 56° |
| August | 87° / 58° | 83° / 55° |
| September | 76° / 48° | 76° / 47° |
| October | 62° / 37° | 65° / 36° |
| November | 48° / 26° | 52° / 26° |
| December | 39° / 17° | 44° / 18° |
Hot, Freezing, Rainy, Snowy Days: Spearfish / Castle Rock
| Month | Hot Days | Freezing Days | Rainy Days | Snowy Days |
|---|
| January | 0 / 0 | 27 / 29 | 6 / 3 | 4 / 4 |
| February | 0 / 0 | 24 / 25 | 6 / 4 | 4 / 4 |
| March | 0 / 0 | 23 / 23 | 7 / 6 | 4 / 5 |
| April | 0 / 0 | 12 / 15 | 9 / 6 | 2 / 4 |
| May | 1 / 0 | 1 / 3 | 11 / 9 | 0 / 1 |
| June | 4 / 2 | 0 / 0 | 12 / 8 | 0 / 0 |
| July | 12 / 8 | 0 / 0 | 9 / 8 | 0 / 0 |
| August | 11 / 4 | 0 / 0 | 7 / 10 | 0 / 0 |
| September | 4 / 1 | 1 / 1 | 6 / 6 | 0 / 0 |
| October | 0 / 0 | 8 / 10 | 7 / 4 | 1 / 1 |
| November | 0 / 0 | 21 / 22 | 6 / 4 | 3 / 4 |
| December | 0 / 0 | 27 / 28 | 6 / 4 | 4 / 4 |
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.
July is the hottest month for Castle Rock with an average high temperature of 85.5°, which ranks it as about average compared to other places in Colorado. In Castle Rock, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Castle Rock are June, September and August.
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 Castle Rock with an average of 18.1°. This is one of the warmest places in Colorado.
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 Castle Rock, there are 14.9 days annually when the high temperature is over 90°, which is cooler than most places in Colorado.
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 Castle Rock, there are 156.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Colorado.
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 Castle Rock, there are 5.6 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Colorado.
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.
August is the wettest month in Castle Rock with 2.6 inches of rain, and the driest month is January with 0.6 inches. The wettest season is Autumn with 40% of yearly precipitation and 10% occurs in Spring, which is the driest season. The annual rainfall of 18.6 inches in Castle Rock means that it is wetter than most places in Colorado.
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.
August is the rainiest month in Castle Rock with 9.9 days of rain, and January is the driest month with only 3.3 rainy days. There are 70.0 rainy days annually in Castle Rock, which is less rainy than most places in Colorado. The rainiest season is Autumn when it rains 37% of the time and the driest is Spring with only a 15% 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 78.3 inches in Castle Rock means that it is snowier than most places in Colorado.
March is the snowiest month in Spearfish with 10.8 inches of snow, and 8 months of the year have significant snowfall.
March is the snowiest month in Castle Rock with 16.8 inches of snow, and 9 months of the year have significant snowfall.
DID YOU KNOW?
Many people confuse Weather and Climate, but they are different. Weather refers to the conditions of the atmosphere over a short period of time, while Climate refers to the conditions of the atmosphere over a long period of time.
Weather, more specifically, refers to how the atmosphere behaves and its effects on life and human activities. Most people think of Weather in terms of what can be observed: temperature, humidity, precipitation, and cloudy/sunny conditions. Weather conditions constantly change on a minute-to-minute basis.
Climate is a record of the average weather conditions for a given place over a long period of time, often referred to as Climate Normals. A 30-year period of record is a common requirement to be considered a Climate Normal.
Reviews for Spearfish 
2 Reviews
Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More
Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More
Start Your Review of Spearfish
Reviews for Castle Rock 2 Reviews
Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More
Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More
Start Your Review of Castle Rock
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