Solar Energy & Solar Power Resources

Solar Power in 91001 (Altadena, CA)

Solar Energy in 91001

Sorry, historical solar radition values for 91001 are currently unavailable, please check back later.

Solar Panels in 91001

Solar panels in 91001 that will produce the maximum solar energy output. [More]

Sunrise & Sunset in 91001

The total length of the day in 91001 (Altadena, CA) today (August 04, 2025) will be 13 hours and 48 minutes. [More]

Solar Energy in 91001 (Altadena, CA)

Solar Energy Data for 91001

See the chart below to see how different types of solar panel installations compare in 91001.

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

Solar Energy Analysis for 91001

Sorry, it is not possible to complete our solar energy analysis for 91001 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 91001

Solar Radiation Data in 91001

See the chart below for monthly solar radiation levels in 91001.

Sorry, data is not currently available.

Solar Radiation Analysis for 91001

Sorry, it is not possible to complete our solar radiation analysis for 91001 at this time.

Historical solar radiation data for 91001 is not currently available.

Please check back later.

Solar Power Comparison: 91001 vs. the U.S.

Solar Power Levels in 91001

Sorry, solar radiation data for 91001 is not currently available.

Solar Power: 91001 vs. the U.S.

Below is a month-by-month comparison of how average 91001 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 91001

Sunrise / Sunset in 91001

Sunrise/Sunset for August 04, 2025 ^[2]
- Sunrise: 6:04 am
- Sunset: 7:52 pm
- Length of Day: 13:48

Best Months for Solar in 91001

Monthly data not currently available.

Solar Panel Installs in 91001

We do not have data on solar panel installations in ZIP Code 91001 at the current time.

Solar Power Output in 91001

The Power of Solar in 91001

Monthly AC solar system output averages for 91001. Month-by-month solar power, as ranked by AC output, in 91001. ^[2]

AC output data is not currently available.

Solar Output Analysis for 91001

Sorry, it is not possible to complete our solar radiation analysis for 91001 at this time.

Historical solar radiation data for 91001 is not currently available.

Please check back later.

Weather Forecast for 91001 ^[5]

Mon Aug 4

85°F

Overcast Clouds
Min: 63°F
Max: 89°F

Gentle Breeze: 9 mps SSW
Precip.: n/a
Humidity: 25%
Cloud cover: 100%

Tue Aug 5

88°F

Broken Clouds
Min: 69°F
Max: 91°F

Gentle Breeze: 9 mps SSW
Precip.: n/a
Humidity: 21%
Cloud cover: 68%

Wed Aug 6

92°F

Sky Is Clear
Min: 71°F
Max: 95°F

Gentle Breeze: 9 mps SSW
Precip.: n/a
Humidity: 16%
Cloud cover: 6%

Thu Aug 7

95°F

Sky Is Clear
Min: 76°F
Max: 99°F

Gentle Breeze: 8 mps SSW
Precip.: n/a
Humidity: 11%
Cloud cover: 1%

Fri Aug 8

95°F

Sky Is Clear
Min: 79°F
Max: 99°F

Gentle Breeze: 8 mps SSW
Precip.: n/a
Humidity: 12%
Cloud cover: 0%

Sat Aug 9

91°F

Sky Is Clear
Min: 76°F
Max: 96°F

Gentle Breeze: 9 mps SSW
Precip.: n/a
Humidity: 21%
Cloud cover: 0%

More about 91001

About 91001

The ZIP code 91001 is associated with the city of Altadena in Los Angeles County in California.

91001 Solar Energy & Power

To learn more about solar energy and solar power in 91001, or for more solar-related resources for CA, check out the U.S. Energy Information Administration.