Solar Energy & Solar Power Resources

Solar Power in 91978 (Spring Valley, CA)

Solar Energy in 91978

Sorry, historical solar radition values for 91978 are currently unavailable, please check back later.

Solar Panels in 91978

Solar panels in 91978 that will produce the maximum solar energy output. [More]

Sunrise & Sunset in 91978

The total length of the day in 91978 (Spring Valley, CA) today (September 10, 2026) will be 12 hours and 35 minutes. [More]

Solar Energy in 91978 (Spring Valley, CA)

Solar Energy Data for 91978

See the chart below to see how different types of solar panel installations compare in 91978.

Historical solar power output data for Spring Valley is not currently available.

Solar Energy Analysis for 91978

Sorry, it is not possible to complete our solar energy analysis for 91978 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 91978

Solar Radiation Data in 91978

See the chart below for monthly solar radiation levels in 91978.

Sorry, data is not currently available.

Solar Radiation Analysis for 91978

Sorry, it is not possible to complete our solar radiation analysis for 91978 at this time.

Historical solar radiation data for 91978 is not currently available.

Please check back later.

Solar Power Comparison: 91978 vs. the U.S.

Solar Power Levels in 91978

Sorry, solar radiation data for 91978 is not currently available.

Solar Power: 91978 vs. the U.S.

Below is a month-by-month comparison of how average 91978 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 91978

Sunrise / Sunset in 91978

Sunrise/Sunset for September 10, 2026 ^[2]
- Sunrise: 6:27 am
- Sunset: 7:02 pm
- Length of Day: 12:35

Best Months for Solar in 91978

Monthly data not currently available.

Solar Panel Installs in 91978

We do not have data on solar panel installations in ZIP Code 91978 at the current time.

Solar Power Output in 91978

The Power of Solar in 91978

Monthly AC solar system output averages for 91978. Month-by-month solar power, as ranked by AC output, in 91978. ^[2]

AC output data is not currently available.

Solar Output Analysis for 91978

Sorry, it is not possible to complete our solar radiation analysis for 91978 at this time.

Historical solar radiation data for 91978 is not currently available.

Please check back later.

Weather Forecast for 91978 ^[5]

Thu Sep 10

95°F

Broken Clouds
Min: 75°F
Max: 99°F

Gentle Breeze: 10 mps WSW
Precip.: n/a
Humidity: 37%
Cloud cover: 61%

Fri Sep 11

90°F

Sky Is Clear
Min: 72°F
Max: 94°F

Gentle Breeze: 10 mps WSW
Precip.: n/a
Humidity: 43%
Cloud cover: 0%

Sat Sep 12

83°F

Sky Is Clear
Min: 71°F
Max: 84°F

Gentle Breeze: 9 mps WSW
Precip.: n/a
Humidity: 40%
Cloud cover: 4%

Sun Sep 13

78°F

Sky Is Clear
Min: 68°F
Max: 80°F

Gentle Breeze: 10 mps SW
Precip.: n/a
Humidity: 47%
Cloud cover: 2%

Mon Sep 14

78°F

Few Clouds
Min: 68°F
Max: 80°F

Gentle Breeze: 10 mps WSW
Precip.: n/a
Humidity: 47%
Cloud cover: 22%

Tue Sep 15

77°F

Few Clouds
Min: 67°F
Max: 80°F

Gentle Breeze: 11 mps WSW
Precip.: n/a
Humidity: 48%
Cloud cover: 20%

More about 91978

About 91978

The ZIP code 91978 is associated with the city of Spring Valley in San Diego County in California.

91978 Solar Energy & Power

To learn more about solar energy and solar power in 91978, or for more solar-related resources for CA, check out the U.S. Energy Information Administration.