Based on historical Castle Rock, WA data, solar panels that are tilted towards the equator at an angle equal to the latitude will produce the maximum solar energy output in Castle Rock.[1]
Castle Rock has an average monthly Global Horizontal Irradiance (GHI) of 3.36 kilowatt hours per square meter per day (kWh/m2/day), which is approximately 7% greater than the average monthly Direct Normal Irradiance (DNI) of 3.15 kWh/m2/day. [1]
Solar installations in Castle Rock that are always titled at the latitude of Castle Rock (Average Tilt at Latitude or ATaL) average 3.82 kWh/m2/day, or about 14% greater than the average monthly GHI of 3.36 kWh/m2/day and approximately 21% greater than the average monthly DNI of 3.15 kWh/m2/day. [1]
Solar Energy Glossary
Global Horizontal Irradiance (GHI)
Global Horizontal Irradiance: The total amount of solar radiation that is received per unit area by a surface that is always positioned in a horizontal manner.
Direct Normal Irradiance (DNI)
Direct Normal Irradiance: The total amount of solar radiation received per unit area by a surface that is always perpendicular to the sun rays that come in a straight line from the direction of the sun at its current position in the sky.
Average Tilt at Latitude (ATaL)
Average Tilt at Latitude: The total amount of solar radiation received per unit area by a surface that is tilted toward the equator at an angle equal to the current latitude. ATaL will often produce the optimum energy output.
Solar Radiation Levels in Castle Rock
Solar Radiation Data in Castle Rock, WA
See the chart below for monthly solar radiation levels in Castle Rock.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day)
Solar Radiation Analysis for Castle Rock, WA
Castle Rock, WA has a average annual solar radiation value of 3.87 kilowatt hours per square meter per day (kWh/m2/day). [1]
The month with the highest historical solar radition values in Castle Rock is July with an average of 5.99 kWh/m2/day, followed by August at 5.77 kWh/m2/day and September at 5.16 kWh/m2/day. [1]
The three months that historically average the lowest average solar radiation levels in Castle Rock (Washington) are December with an average of 1.63 kWh/m2/day, followed by January with an average of 1.85 kWh/m2/day and November at 1.93 kWh/m2/day. [1]
Solar Power Comparison: Castle Rock vs. the U.S.
Solar Power Levels in Castle Rock
The average monthly solar radiation level in Castle Rock, WA, of 3.87 kilowatt hours per square meter per day (kWh/m2/day) is approximately 2% less than the average level of 3.93 kWh/m2/day in a city with historically low levels (WA) and is approximately 41% less than the average level of 6.61 kWh/m2/day in a city with historically high levels (NV). [1]
→ Values listed as 0 (zero) are not available (N/A).
Solar Power: Castle Rock vs. the U.S.
Below is a month-by-month comparison of how average Castle Rock solar radiation levels compare to average levels in a city with historcially high levels (NV) and a city with historically low levels (WA). [1]
→ k/m/d = kWh/m2/day = kilowatt hours per square meter per day.
→ Values listed as 0 (zero) are not available (N/A).
We do not currently have data on solar panel installations in the city of Castle Rock, WA at this current time.
Solar Power Output in Castle Rock
The Power of Solar in Castle Rock, WA
Monthly AC solar system output averages for Castle Rock (wa). Month-by-month solar power, as ranked by AC output, in Castle Rock. [2]
* Amounts listed in kWhac (kilowatt hours (AC))
Solar Output Analysis for Castle Rock, WA
Castle Rock (WA) has a average annual solar AC output value of 4312.44 kilowatt hours (AC). [2]
The month with the highest historical solar power output in Castle Rock is July with an average of 548.57 kWhac, followed by August at 526.55 kWhac and May at 480.2 kWhac. [2]
The three months that historically average the lowest average solar output levels in Castle Rock (Washington) are December with an average of 163.52 kWhac, followed by January with an average of 184.84 kWhac and November at 185.76 kWhac. [2]
Cost of Utilities in Castle Rock
Castle Rock Electricity Costs
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Solar Power Poll: Castle Rock
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Castle Rock Natural Gas Costs
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Gentle Breeze: 10 mps W
Precip.: Chance of Rain
Humidity: 67%
Cloud cover: 99%
Mon Apr 29
54°F
Light Rain
Min: 37°F
Max: 54°F
Gentle Breeze: 9 mps W
Precip.: Chance of Rain
Humidity: 52%
Cloud cover: 99%
Tue Apr 30
61°F
Light Rain
Min: 34°F
Max: 61°F
Light breeze: 5 mps S
Precip.: Chance of Rain
Humidity: 34%
Cloud cover: 100%
More about Castle Rock
About Castle Rock
The city of Castle Rock, WA in Cowlitz County has an approximate population of 1,982. [6]
Castle Rock, WA Solar Energy
To learn more about solar energy and solar power Castle Rock, WA, or for more solar-related resources for Castle Rock, visit the U.S. Energy Information Administration.
Did you know?
Some tax incentives and rebate programs are designed to spur the use of solar energy. These vary by location.
