Solar Energy & Solar Power Resources

Solar Energy in Saint Helena, CA

Solar Energy in Saint Helena

Sorry, historical solar radition values for Saint Helena are currently unavailable, please check back later.

Solar Panels in Saint Helena

Solar panels in Saint Helena that will produce the maximum solar energy output. [More]

Sunrise & Sunset in Saint Helena

The total length of the day in Saint Helena, CA today (May 11, 2025) will be 14 hours and 13 minutes. [More]

Solar Power in Saint Helena, CA

Solar Energy Data in Saint Helena, CA

See the chart below to see how different types of solar panel installations compare in Saint Helena.

Historical solar power output data for Saint Helena is not currently available.

Solar Energy Analysis for Saint Helena, CA

Sorry, it is not possible to complete our solar energy analysis for Saint Helena at this time.

Please check back later.

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 Saint Helena

Solar Radiation Data in Saint Helena, CA

See the chart below for monthly solar radiation levels in Saint Helena.

Sorry, data is not currently available.

Solar Radiation Analysis for Saint Helena, CA

Sorry, it is not possible to complete our solar radiation analysis for Saint Helena at this time.

Historical solar radiation data for Saint Helena is not currently available.

Please check back later.

Solar Power Comparison: Saint Helena vs. the U.S.

Solar Power Levels in Saint Helena

Sorry, solar radiation data for California is not currently available.

Solar Power: Saint Helena vs. the U.S.

Below is a month-by-month comparison of how average Saint Helena solar radiation levels compare to average levels in a city with historcially high levels (NV) and a city with historically low levels (WA). ^[1]

Sorry, solar radiation data for California is not currently available.

Solar Data & Statistics for Saint Helena

Sunrise / Sunset in Saint Helena

Sunrise/Sunset for May 11, 2025 ^[2]
- Sunrise: 5:59 am
- Sunset: 8:12 pm
- Length of Day: 14:13

Solar Energy Statistics for Saint Helena

Best Months for Solar in Saint Helena

Monthly data not currently available.

Solar Panel Installs in Saint Helena

We do not currently have data on solar panel installations in the city of Saint Helena, CA at this current time.

Solar Power Output in Saint Helena

The Power of Solar in Saint Helena, CA

Monthly AC solar system output averages for Saint Helena (ca). Month-by-month solar power, as ranked by AC output, in Saint Helena. ^[2]

AC output data is not currently available.

Solar Output Analysis for Saint Helena, CA

Sorry, it is not possible to complete our solar radiation analysis for Saint Helena at this time.

Historical solar radiation data for Saint Helena is not currently available.

Please check back later.

Cost of Utilities in Saint Helena

Saint Helena Electricity Costs

Sorry, Saint Helena residential electricity prices are currently unavailable.

Please check back later.

Solar Power Poll: Saint Helena

Vote now: Given all of the data and analysis provided for Saint Helena, is solar power a good choice for residents of this city?

Saint Helena Natural Gas Costs

Sorry, California residential natural gas prices are currently unavailable.

Please check back later.

Weather Forecast for Saint Helena, CA ^[5]

Sun May 11

69°F

Sky Is Clear
Min: 52°F
Max: 69°F

Moderate breeze: 15 mps WSW
Precip.: n/a
Humidity: 49%
Cloud cover: 3%

Mon May 12

64°F

Light Rain
Min: 46°F
Max: 64°F

Moderate breeze: 14 mps WSW
Precip.: Chance of Rain
Humidity: 36%
Cloud cover: 7%

Tue May 13

72°F

Broken Clouds
Min: 43°F
Max: 72°F

Gentle Breeze: 10 mps SW
Precip.: n/a
Humidity: 33%
Cloud cover: 63%

Wed May 14

75°F

Sky Is Clear
Min: 47°F
Max: 76°F

Gentle Breeze: 11 mps SW
Precip.: n/a
Humidity: 34%
Cloud cover: 9%

Thu May 15

79°F

Overcast Clouds
Min: 52°F
Max: 79°F

Gentle Breeze: 11 mps WSW
Precip.: n/a
Humidity: 32%
Cloud cover: 92%

Fri May 16

84°F

Overcast Clouds
Min: 53°F
Max: 84°F

Light breeze: 7 mps SW
Precip.: n/a
Humidity: 28%
Cloud cover: 100%

More about Saint Helena

About Saint Helena

The city of Saint Helena, CA in Napa County has an approximate population of 5,814. ^[6]

Saint Helena, CA Solar Energy

To learn more about solar energy and solar power Saint Helena, CA, or for more solar-related resources for Saint Helena, visit the U.S. Energy Information Administration.