Castle Rock (CO) Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Castle Rock, Colorado, United States of America. The numbers reflect climate data gathered over a 30-year period, from 1990 to 2020. Now, let's explore all the details to give you a full picture.

Castle Rock's climate is marked by below-average rain/snowfall, accumulating 475 mm (19 in) of precipitation yearly. The distribution includes a distinct dry season during certain months as shown in the precipitation charts below.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

Significant seasonal changes in precipitation occur throughout the year. During the wettest month, July receives substantial rainfall, averaging 79 mm (3.1 in) of precipitation, recorded across 15 rainy days.

In contrast, the driest month, January brings less snowfall, with 14 mm (0.6 in) over 5 snowy days.

July, the wettest month, has a maximum daytime temperature of 30°C (86°F). The city receives 323 hours of sunshine in this period. During the driest month January you can expect a temperature of 7°C (45°F). For more detailed insights into the city's temperatures, visit our Castle Rock Temperature page.

Castle Rock's average annual precipitation is 475 mm (19 in). Let's compare this to some popular worldwide tourist destinations:

The climate in San Francisco, USA, is influenced by coastal weather, with 469 mm (18 in) of rainfall mostly during the winter months.

Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm (39 in) of annual rainfall, mostly in the summer.

Perth, Australia, receives 565 mm (22 in) of rainfall annually, mostly during the winter months.

Ho Chi Minh City, Vietnam, receives 1955 mm (77 in) of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

• The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
• Approximately 70% of lightning bolts strike land rather than oceans.
• A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.

For more detailed information about Castle Rock (CO)'s weather, including sunshine hours, humidity levels, and temperature data, visit our Castle Rock (CO) Climate page.