Solar Energy & Solar Power Resources

Solar Power in 78631 (Harper, TX)

Solar Energy in 78631

Sorry, historical solar radition values for 78631 are currently unavailable, please check back later.

Solar Panels in 78631

Solar panels in 78631 that will produce the maximum solar energy output. [More]

Sunrise & Sunset in 78631

The total length of the day in 78631 (Harper, TX) today (July 20, 2026) will be 13 hours and 52 minutes. [More]

Solar Energy in 78631 (Harper, TX)

Solar Energy Data for 78631

See the chart below to see how different types of solar panel installations compare in 78631.

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

Solar Energy Analysis for 78631

Sorry, it is not possible to complete our solar energy analysis for 78631 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 78631

Solar Radiation Data in 78631

See the chart below for monthly solar radiation levels in 78631.

Sorry, data is not currently available.

Solar Radiation Analysis for 78631

Sorry, it is not possible to complete our solar radiation analysis for 78631 at this time.

Historical solar radiation data for 78631 is not currently available.

Please check back later.

Solar Power Comparison: 78631 vs. the U.S.

Solar Power Levels in 78631

Sorry, solar radiation data for 78631 is not currently available.

Solar Power: 78631 vs. the U.S.

Below is a month-by-month comparison of how average 78631 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 Texas is not currently available.

Solar Data & Statistics for 78631

Sunrise / Sunset in 78631

Sunrise/Sunset for July 20, 2026 ^[2]
- Sunrise: 6:47 am
- Sunset: 8:39 pm
- Length of Day: 13:52

Best Months for Solar in 78631

Monthly data not currently available.

Solar Panel Installs in 78631

We do not have data on solar panel installations in ZIP Code 78631 at the current time.

Solar Power Output in 78631

The Power of Solar in 78631

Monthly AC solar system output averages for 78631. Month-by-month solar power, as ranked by AC output, in 78631. ^[2]

AC output data is not currently available.

Solar Output Analysis for 78631

Sorry, it is not possible to complete our solar radiation analysis for 78631 at this time.

Historical solar radiation data for 78631 is not currently available.

Please check back later.

Weather Forecast for 78631 ^[5]

Mon Jul 20

90°F

Sky Is Clear
Min: 70°F
Max: 93°F

Moderate breeze: 15 mps S
Precip.: n/a
Humidity: 52%
Cloud cover: 4%

Tue Jul 21

94°F

Sky Is Clear
Min: 71°F
Max: 100°F

Gentle Breeze: 10 mps S
Precip.: n/a
Humidity: 32%
Cloud cover: 0%

Wed Jul 22

100°F

Sky Is Clear
Min: 76°F
Max: 100°F

Gentle Breeze: 9 mps SSW
Precip.: n/a
Humidity: 31%
Cloud cover: 2%

Thu Jul 23

96°F

Sky Is Clear
Min: 80°F
Max: 98°F

Moderate breeze: 15 mps ENE
Precip.: n/a
Humidity: 38%
Cloud cover: 0%

Fri Jul 24

90°F

Few Clouds
Min: 76°F
Max: 92°F

Moderate breeze: 15 mps SSE
Precip.: n/a
Humidity: 46%
Cloud cover: 15%

Sat Jul 25

89°F

Sky Is Clear
Min: 72°F
Max: 92°F

Fresh Breeze: 19 mps S
Precip.: n/a
Humidity: 33%
Cloud cover: 0%

More about 78631

About 78631

The ZIP code 78631 is associated with the city of Harper in Gillespie County in Texas.

78631 Solar Energy & Power

To learn more about solar energy and solar power in 78631, or for more solar-related resources for TX, check out the U.S. Energy Information Administration.