Castle Rock receives its highest rainfall in May, while humidity peaks during winter months.
🌧️ Wettest:May — 64 mm☀️ Driest:Jan — 17 mm
💧 Humidity peaks at 56% in Dec · annual avg 50%
🌍 Climate Summary
Avg Annual Temp:49.3°F
Avg Annual Rainfall:462 mm
Avg Humidity:50%
Data Period:1981 – 2025
Castle Rock Climate Overview
Castle Rock has a temperate climate with warm summers and freezing winters.
Temperatures peak in Jul and drop to their lowest in Jan,
while rainfall is highest during spring and early summer months.
Humidity remains relatively low throughout the year, especially during winter months, creating cold and dry conditions.
📈 Yearly Trends
The warmest year in Castle Rock's recorded history was 2025
(avg: 52.7°F),
while the coldest year was 1993
(avg: 46.2°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Castle Rock's temperature shows a slight warming trend over the past decade
📈 Minimum temperatures show a slight warming trend in recent years
🌧️ Rainfall has increased noticeably in recent years compared to earlier periods
🌡️ Annual Temperature Trend
View Range:
Average annual high/low · Last 10 years · °F
Castle Rock's temperatures shows a slight warming trend over the past decade.
The highest recorded temperature reached
98.8°F in Jul 2005,
while the lowest dropped to
-13.3°F in Feb 2011.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Castle Rock shows noticeable variation. Rainfall has increased noticeably in recent years compared to earlier periods.
Based on 45 years of data (1981–2025), Jul is typically the hottest month in Castle Rock, Colorado, with average high temperatures around 94.9°F.
What is the coldest month in Castle Rock?▼
Jan is the coldest month in Castle Rock, with average low temperatures around 3.6°F.
What is the rainiest month in Castle Rock?▼
May receives the most rainfall with approximately 64 mm, while Jan is the driest with 17 mm.
What was the highest temperature ever recorded in Castle Rock?▼
The highest recorded temperature was 98.8°F in Jul 2005. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Castle Rock?▼
The lowest recorded temperature was -13.3°F in Feb 2011.
How many years of data does this page cover?▼
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
How much sunlight does Castle Rock get?▼
Castle Rock receives the most sunlight in Jun with an average solar radiation of 7.06 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in Colorado.
Where does this weather data come from?▼
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.