Solar Energy & Solar Power Resources

Solar Power in 91791 (West Covina, CA)

Solar Energy in 91791

Sorry, historical solar radition values for 91791 are currently unavailable, please check back later.

Solar Panels in 91791

Solar panels in 91791 that will produce the maximum solar energy output. [More]

Sunrise & Sunset in 91791

The total length of the day in 91791 (West Covina, CA) today (September 17, 2025) will be 12 hours and 21 minutes. [More]

Solar Energy in 91791 (West Covina, CA)

Solar Energy Data for 91791

See the chart below to see how different types of solar panel installations compare in 91791.

Historical solar power output data for West Covina is not currently available.

Solar Energy Analysis for 91791

Sorry, it is not possible to complete our solar energy analysis for 91791 at this time.

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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 91791

Solar Radiation Data in 91791

See the chart below for monthly solar radiation levels in 91791.

Sorry, data is not currently available.

Solar Radiation Analysis for 91791

Sorry, it is not possible to complete our solar radiation analysis for 91791 at this time.

Historical solar radiation data for 91791 is not currently available.

Please check back later.

Solar Power Comparison: 91791 vs. the U.S.

Solar Power Levels in 91791

Sorry, solar radiation data for 91791 is not currently available.

Solar Power: 91791 vs. the U.S.

Below is a month-by-month comparison of how average 91791 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 91791

Sunrise / Sunset in 91791

Sunrise/Sunset for September 17, 2025 ^[2]
- Sunrise: 6:35 am
- Sunset: 6:56 pm
- Length of Day: 12:21

Best Months for Solar in 91791

Monthly data not currently available.

Solar Panel Installs in 91791

We do not have data on solar panel installations in ZIP Code 91791 at the current time.

Solar Power Output in 91791

The Power of Solar in 91791

Monthly AC solar system output averages for 91791. Month-by-month solar power, as ranked by AC output, in 91791. ^[2]

AC output data is not currently available.

Solar Output Analysis for 91791

Sorry, it is not possible to complete our solar radiation analysis for 91791 at this time.

Historical solar radiation data for 91791 is not currently available.

Please check back later.

Weather Forecast for 91791 ^[5]

Wed Sep 17

91°F

Sky Is Clear
Min: 71°F
Max: 91°F

Moderate breeze: 14 mps SSW
Precip.: n/a
Humidity: 37%
Cloud cover: 0%

Thu Sep 18

82°F

Light Rain
Min: 69°F
Max: 85°F

Gentle Breeze: 10 mps SSW
Precip.: Chance of Rain
Humidity: 57%
Cloud cover: 85%

Fri Sep 19

76°F

Light Rain
Min: 71°F
Max: 81°F

Gentle Breeze: 9 mps SSW
Precip.: Chance of Rain
Humidity: 71%
Cloud cover: 91%

Sat Sep 20

81°F

Sky Is Clear
Min: 71°F
Max: 87°F

Gentle Breeze: 9 mps WSW
Precip.: n/a
Humidity: 52%
Cloud cover: 0%

Sun Sep 21

83°F

Sky Is Clear
Min: 74°F
Max: 90°F

Gentle Breeze: 10 mps SW
Precip.: n/a
Humidity: 45%
Cloud cover: 3%

Mon Sep 22

86°F

Sky Is Clear
Min: 75°F
Max: 93°F

Gentle Breeze: 9 mps WSW
Precip.: n/a
Humidity: 38%
Cloud cover: 5%

More about 91791

About 91791

The ZIP code 91791 is associated with the city of West Covina in Los Angeles County in California.

91791 Solar Energy & Power

To learn more about solar energy and solar power in 91791, or for more solar-related resources for CA, check out the U.S. Energy Information Administration.