Castle Rock Average Temperature by Month

This page shows the average temperature in each month of the year in Castle Rock, Colorado. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Castle Rock?
In Castle Rock, Colorado, the warmest month is July, with an average daily high temperature of 86.0 °F and an average low of 55.4 °F.
What's the Coldest Month in Castle Rock?
In Castle Rock, Colorado, the coolest month is January, with an average daily high temperature of 45.6 °F and an average low of 16.9 °F.
Month Avg. High Avg. Low
January 45.6 °F 16.9 °F
February 46.7 °F 18.8 °F
March 54.0 °F 25.8 °F
April 59.3 °F 31.8 °F
May 68.9 °F 41.1 °F
June 80.3 °F 49.4 °F
July 86.0 °F 55.4 °F
August 83.6 °F 53.9 °F
September 77.2 °F 46.1 °F
October 65.3 °F 34.3 °F
November 54.3 °F 25.0 °F
December 46.0 °F 17.2 °F
Year 64.2 °F 34.6 °F
Weather Station Details
Years Station Coordinates
1893–2024 Castle Rock location
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