Solar Energy & Solar Power Resources

Solar Power in 40221 (Louisville, KY)

Solar Energy in 40221

Sorry, historical solar radition values for 40221 are currently unavailable, please check back later.

Solar Panels in 40221

Solar panels in 40221 that will produce the maximum solar energy output. [More]

Sunrise & Sunset in 40221

The total length of the day in 40221 (Louisville, KY) today (September 12, 2026) will be 12 hours and 37 minutes. [More]

Solar Energy in 40221 (Louisville, KY)

Solar Energy Data for 40221

See the chart below to see how different types of solar panel installations compare in 40221.

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

Solar Energy Analysis for 40221

Sorry, it is not possible to complete our solar energy analysis for 40221 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 40221

Solar Radiation Data in 40221

See the chart below for monthly solar radiation levels in 40221.

Sorry, data is not currently available.

Solar Radiation Analysis for 40221

Sorry, it is not possible to complete our solar radiation analysis for 40221 at this time.

Historical solar radiation data for 40221 is not currently available.

Please check back later.

Solar Power Comparison: 40221 vs. the U.S.

Solar Power Levels in 40221

Sorry, solar radiation data for 40221 is not currently available.

Solar Power: 40221 vs. the U.S.

Below is a month-by-month comparison of how average 40221 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 Kentucky is not currently available.

Solar Data & Statistics for 40221

Sunrise / Sunset in 40221

Sunrise/Sunset for September 12, 2026 ^[2]
- Sunrise: 7:20 am
- Sunset: 7:57 pm
- Length of Day: 12:37

Best Months for Solar in 40221

Monthly data not currently available.

Solar Panel Installs in 40221

We do not have data on solar panel installations in ZIP Code 40221 at the current time.

Solar Power Output in 40221

The Power of Solar in 40221

Monthly AC solar system output averages for 40221. Month-by-month solar power, as ranked by AC output, in 40221. ^[2]

AC output data is not currently available.

Solar Output Analysis for 40221

Sorry, it is not possible to complete our solar radiation analysis for 40221 at this time.

Historical solar radiation data for 40221 is not currently available.

Please check back later.

Weather Forecast for 40221 ^[5]

Sat Sep 12

74°F

Moderate Rain
Min: 72°F
Max: 76°F

Light breeze: 7 mps S
Precip.: Chance of Rain
Humidity: 81%
Cloud cover: 100%

Sun Sep 13

77°F

Light Rain
Min: 71°F
Max: 84°F

Moderate breeze: 12 mps NNE
Precip.: Chance of Rain
Humidity: 51%
Cloud cover: 72%

Mon Sep 14

76°F

Light Rain
Min: 64°F
Max: 83°F

Gentle Breeze: 10 mps ENE
Precip.: Chance of Rain
Humidity: 47%
Cloud cover: 38%

Tue Sep 15

95°F

Few Clouds
Min: 67°F
Max: 98°F

Light breeze: 7 mps SW
Precip.: n/a
Humidity: 38%
Cloud cover: 18%

Wed Sep 16

96°F

Light Rain
Min: 74°F
Max: 96°F

Gentle Breeze: 8 mps SW
Precip.: Chance of Rain
Humidity: 36%
Cloud cover: 27%

Thu Sep 17

96°F

Light Rain
Min: 75°F
Max: 98°F

Light breeze: 5 mps NNE
Precip.: Chance of Rain
Humidity: 37%
Cloud cover: 0%

More about 40221

About 40221

The ZIP code 40221 is associated with the city of Louisville in Jefferson County in Kentucky.

40221 Solar Energy & Power

To learn more about solar energy and solar power in 40221, or for more solar-related resources for KY, check out the U.S. Energy Information Administration.