Castle Rock (CO) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Castle Rock.
Climate overview of Castle Rock
Temperatures in Castle Rock, Colorado, United States of America, vary greatly throughout the year. July is the hottest month at 30°C (86°F), while December is the coldest at 6°C (43°F).
The city has a relatively dry climate, receiving around 475 mm (19 in) of rain/snowfall per year. It does experience a distinct dry season from October to March. July is the wettest month and January the driest. Sunshine peaks in July, when the city sees around 10.8 hours of sunshine per day.
Castle Rock Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Castle Rock — and find the best time to visit.
Monthly Temperature in Castle Rock
The climate in Castle Rock is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a comfortable 30°C (86°F) in July to a chilly 6°C (43°F) in December.
Nighttime temperatures range from 14°C (57°F) in July to -9°C (16°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Castle Rock
Castle Rock has a relatively dry climate with low precipitation, averaging 475 mm (19 in) of rain/snowfall annually. The seasons in Castle Rock bring significant changes in precipitation. The wettest month, July, receives moderate rainfall, with an average of 79 mm (3.1 in) of precipitation. This rainfall is distributed across 15 rainy days.
In contrast, the driest month, January, experiences much less snowfall, totaling 14 mm (0.6 in) over 5 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Castle Rock Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Castle Rock
In Castle Rock, summer days are longer and more sunny, with daily sunshine hours peaking at 10.8 hours in July. As the darker season arrives, the brightness of the sun becomes less. November sees a soft sun for only 6.5 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Castle Rock by Month
The relative humidity is moderate throughout the year in Castle Rock.
The city experiences its highest humidity in December, reaching 56%. In July, the humidity drops to its lowest level at 46%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Castle Rock
Frequently asked questions about the climate in Castle Rock
What is the best time to visit Castle Rock?
June, August and September typically offer the most optimal weather in Castle Rock. In contrast, January, February and December tend to have less optimal conditions. Castle Rock has a distinct dry season from October to March.
What temperatures can I expect in Castle Rock?
Daytime highs range from 6°C (43°F) in December to 30°C (86°F) in July. Nighttime lows range from -9°C (16°F) to 14°C (57°F). Temperatures vary considerably through the year.
How much rain does Castle Rock get?
Annual rainfall is around 475 mm (19 in). July is the wettest month with 79 mm (3.1 in), while January is the driest with 14 mm (0.6 in).
How sunny is Castle Rock?
Castle Rock receives around 3,102 hours of sunshine per year. July is the sunniest month with 323 hours, while November is the cloudiest with just 195 hours. Overall, Castle Rock enjoys abundant sunshine.
Castle Rock 3-Day Forecast
Castle Rock (CO) 3-Day Forecast
Castle Rock on the map
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