2024 Compare Climate & Weather:
Castle Rock, CO vs Casper, WY
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Highlights
On average, there are 220 sunny days per year in Casper. Castle Rock averages 243 sunny days per year. The US average is 205 sunny days.
Casper, Wyoming gets 13 inches of rain, on average, per year. Castle Rock, Colorado gets 18.6 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.
Casper averages 70.3 inches of snow per year. Castle Rock averages 78.3 inches of snow per year. The US average is 27.8 inches of snow per year.
Weather Highlights
Casper, Wyoming
Summer High: the July high is around 88.2 degrees
Winter Low: the January low is 15.4
Rain: averages 13 inches of rain a year
Snow: averages 70.3 inches of snow a year
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
BESTPLACES COMFORT INDEX
CasperThe annual BestPlaces Comfort Index for Casper is 6.8 (10=best), which means it is more comfortable than most places in Wyoming.
6.8 / 10
June, August and September are the most pleasant months in Casper, while December and February are the least comfortable months.
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.
Today's Weather - Casper, WY
3 PM PST
Rain Showers
40°F
| DAY | DESCRIPTION | HIGH / LOW | WIND |
|---|
| This Afternoon | Rain Showers | 44° / 37° | W 22 to 26 mph |
| Tuesday | Mostly Sunny then Slight Chance Rain Showers | 49° / 35° | WSW 24 to 29 mph |
| Wednesday | Chance Snow Showers then Rain And Snow Showers | 46° / 37° | WNW 15 to 25 mph |
| Thursday | Rain Showers | 53° / 36° | N 10 to 14 mph |
| Friday | Partly Sunny then Slight Chance Rain Showers | 60° / 37° | WNW 9 mph |
| Saturday | Sunny | 67° / 40° | W 9 to 13 mph |
| Sunday | Sunny then Slight Chance Rain Showers | 70° / 44° | W 9 to 13 mph |
Average Monthly High / Low (°F)
| Month | Castle Rock, CO | Casper, WY |
|---|
| January | 45° / 19° | 37° / 15° |
| February | 46° / 20° | 39° / 17° |
| March | 53° / 26° | 48° / 24° |
| April | 60° / 32° | 57° / 31° |
| May | 69° / 41° | 68° / 40° |
| June | 79° / 50° | 79° / 48° |
| July | 86° / 56° | 88° / 55° |
| August | 83° / 55° | 87° / 54° |
| September | 76° / 47° | 75° / 43° |
| October | 65° / 36° | 60° / 33° |
| November | 52° / 26° | 46° / 24° |
| December | 44° / 18° | 36° / 15° |
Hot, Freezing, Rainy, Snowy Days: Castle Rock / Casper
| Month | Hot Days | Freezing Days | Rainy Days | Snowy Days |
|---|
| January | 0 / 0 | 29 / 29 | 3 / 5 | 4 / 6 |
| February | 0 / 0 | 25 / 26 | 4 / 6 | 4 / 6 |
| March | 0 / 0 | 23 / 25 | 6 / 7 | 5 / 6 |
| April | 0 / 0 | 15 / 17 | 6 / 9 | 4 / 5 |
| May | 0 / 0 | 3 / 5 | 9 / 10 | 1 / 1 |
| June | 2 / 4 | 0 / 0 | 8 / 8 | 0 / 0 |
| July | 8 / 13 | 0 / 0 | 8 / 6 | 0 / 0 |
| August | 4 / 11 | 0 / 0 | 10 / 5 | 0 / 0 |
| September | 1 / 1 | 1 / 2 | 6 / 6 | 0 / 1 |
| October | 0 / 0 | 10 / 14 | 4 / 6 | 1 / 3 |
| November | 0 / 0 | 22 / 23 | 4 / 6 | 4 / 5 |
| December | 0 / 0 | 28 / 28 | 4 / 6 | 4 / 6 |
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.
July is the hottest month for Casper with an average high temperature of 88.2°, which ranks it as warmer than most places in Wyoming. In Casper, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Casper are June, September and August.
December has the coldest nighttime temperatures for Castle Rock with an average of 18.1°. This is one of the warmest places in Colorado.
January has the coldest nighttime temperatures for Casper with an average of 15.4°. This is one of the warmest places in Wyoming.
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 Casper, there are 29.7 days annually when the high temperature is over 90°, which is hotter than most places in Wyoming.
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 Casper, there are 168.3 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Wyoming.
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.
In Casper, there are 12.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Wyoming.
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.
May is the wettest month in Casper with 2.2 inches of rain, and the driest month is January with 0.5 inches. The wettest season is Summer with 35% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 13.0 inches in Casper means that it is about average compared to other places in Wyoming.
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.
May is the rainiest month in Casper with 10.0 days of rain, and January is the driest month with only 5.0 rainy days. There are 79.2 rainy days annually in Casper, which is rainier than most places in Wyoming. The rainiest season is Summer when it rains 32% of the time and the driest is Spring with only a 20% chance of a rainy day.
An annual snowfall of 78.3 inches in Castle Rock means that it is snowier than most places in Colorado.
An annual snowfall of 70.3 inches in Casper means that it is snowier than most places in Wyoming.
March is the snowiest month in Castle Rock with 16.8 inches of snow, and 9 months of the year have significant snowfall.
March is the snowiest month in Casper with 11.5 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 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
Reviews for Casper 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 Casper
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