Solar Energy & Solar Power Resources

Solar Power in 91788 (Walnut, CA)

Solar Energy in 91788

Sorry, historical solar radition values for 91788 are currently unavailable, please check back later.

Solar Panels in 91788

Solar panels in 91788 that will produce the maximum solar energy output. [More]

Sunrise & Sunset in 91788

The total length of the day in 91788 (Walnut, CA) today (October 21, 2025) will be 11 hours and 11 minutes. [More]

Solar Energy in 91788 (Walnut, CA)

Solar Energy Data for 91788

See the chart below to see how different types of solar panel installations compare in 91788.

Historical solar power output data for Walnut is not currently available.

Solar Energy Analysis for 91788

Sorry, it is not possible to complete our solar energy analysis for 91788 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 91788

Solar Radiation Data in 91788

See the chart below for monthly solar radiation levels in 91788.

Sorry, data is not currently available.

Solar Radiation Analysis for 91788

Sorry, it is not possible to complete our solar radiation analysis for 91788 at this time.

Historical solar radiation data for 91788 is not currently available.

Please check back later.

Solar Power Comparison: 91788 vs. the U.S.

Solar Power Levels in 91788

Sorry, solar radiation data for 91788 is not currently available.

Solar Power: 91788 vs. the U.S.

Below is a month-by-month comparison of how average 91788 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 91788

Sunrise / Sunset in 91788

Sunrise/Sunset for October 21, 2025 ^[2]
- Sunrise: 7:00 am
- Sunset: 6:11 pm
- Length of Day: 11:11

Best Months for Solar in 91788

Monthly data not currently available.

Solar Panel Installs in 91788

We do not have data on solar panel installations in ZIP Code 91788 at the current time.

Solar Power Output in 91788

The Power of Solar in 91788

Monthly AC solar system output averages for 91788. Month-by-month solar power, as ranked by AC output, in 91788. ^[2]

AC output data is not currently available.

Solar Output Analysis for 91788

Sorry, it is not possible to complete our solar radiation analysis for 91788 at this time.

Historical solar radiation data for 91788 is not currently available.

Please check back later.

Weather Forecast for 91788 ^[5]

Tue Oct 21

68°F

Few Clouds
Min: 56°F
Max: 81°F

Gentle Breeze: 11 mps SW
Precip.: n/a
Humidity: 43%
Cloud cover: 13%

Wed Oct 22

70°F

Sky Is Clear
Min: 61°F
Max: 71°F

Gentle Breeze: 12 mps SW
Precip.: n/a
Humidity: 43%
Cloud cover: 0%

Thu Oct 23

69°F

Sky Is Clear
Min: 60°F
Max: 74°F

Gentle Breeze: 9 mps WSW
Precip.: n/a
Humidity: 52%
Cloud cover: 6%

Fri Oct 24

74°F

Sky Is Clear
Min: 64°F
Max: 80°F

Light breeze: 7 mps SW
Precip.: n/a
Humidity: 36%
Cloud cover: 0%

Sat Oct 25

73°F

Sky Is Clear
Min: 64°F
Max: 78°F

Gentle Breeze: 8 mps SW
Precip.: n/a
Humidity: 46%
Cloud cover: 0%

Sun Oct 26

69°F

Broken Clouds
Min: 63°F
Max: 73°F

Gentle Breeze: 9 mps SW
Precip.: n/a
Humidity: 55%
Cloud cover: 84%

More about 91788

About 91788

The ZIP code 91788 is associated with the city of Walnut in Los Angeles County in California.

91788 Solar Energy & Power

To learn more about solar energy and solar power in 91788, or for more solar-related resources for CA, check out the U.S. Energy Information Administration.