Solar Energy & Solar Power Resources

Solar Power in 99140 (Keller, WA)

Solar Energy in 99140

Sorry, historical solar radition values for 99140 are currently unavailable, please check back later.

Solar Panels in 99140

Solar panels in 99140 that will produce the maximum solar energy output. [More]

Sunrise & Sunset in 99140

The total length of the day in 99140 (Keller, WA) today (October 14, 2025) will be 10 hours and 58 minutes. [More]

Solar Energy in 99140 (Keller, WA)

Solar Energy Data for 99140

See the chart below to see how different types of solar panel installations compare in 99140.

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

Solar Energy Analysis for 99140

Sorry, it is not possible to complete our solar energy analysis for 99140 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 99140

Solar Radiation Data in 99140

See the chart below for monthly solar radiation levels in 99140.

Sorry, data is not currently available.

Solar Radiation Analysis for 99140

Sorry, it is not possible to complete our solar radiation analysis for 99140 at this time.

Historical solar radiation data for 99140 is not currently available.

Please check back later.

Solar Power Comparison: 99140 vs. the U.S.

Solar Power Levels in 99140

Sorry, solar radiation data for 99140 is not currently available.

Solar Power: 99140 vs. the U.S.

Below is a month-by-month comparison of how average 99140 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 Washington is not currently available.

Solar Data & Statistics for 99140

Sunrise / Sunset in 99140

Sunrise/Sunset for October 14, 2025 ^[2]
- Sunrise: 7:11 am
- Sunset: 6:09 pm
- Length of Day: 10:58

Best Months for Solar in 99140

Monthly data not currently available.

Solar Panel Installs in 99140

We do not have data on solar panel installations in ZIP Code 99140 at the current time.

Solar Power Output in 99140

The Power of Solar in 99140

Monthly AC solar system output averages for 99140. Month-by-month solar power, as ranked by AC output, in 99140. ^[2]

AC output data is not currently available.

Solar Output Analysis for 99140

Sorry, it is not possible to complete our solar radiation analysis for 99140 at this time.

Historical solar radiation data for 99140 is not currently available.

Please check back later.

Weather Forecast for 99140 ^[5]

Tue Oct 14

47°F

Sky Is Clear
Min: 35°F
Max: 58°F

Light breeze: 5 mps NNE
Precip.: n/a
Humidity: 52%
Cloud cover: 0%

Wed Oct 15

59°F

Sky Is Clear
Min: 38°F
Max: 61°F

Light breeze: 4 mps WSW
Precip.: n/a
Humidity: 27%
Cloud cover: 0%

Thu Oct 16

56°F

Overcast Clouds
Min: 40°F
Max: 58°F

Light breeze: 5 mps S
Precip.: n/a
Humidity: 34%
Cloud cover: 100%

Fri Oct 17

52°F

Broken Clouds
Min: 39°F
Max: 58°F

Light breeze: 5 mps SW
Precip.: n/a
Humidity: 44%
Cloud cover: 60%

Sat Oct 18

51°F

Broken Clouds
Min: 42°F
Max: 59°F

Light breeze: 4 mps ENE
Precip.: n/a
Humidity: 46%
Cloud cover: 53%

Sun Oct 19

59°F

Light Rain
Min: 48°F
Max: 59°F

Light breeze: 5 mps ENE
Precip.: Chance of Rain
Humidity: 41%
Cloud cover: 96%

More about 99140

About 99140

The ZIP code 99140 is associated with the city of Keller in Ferry County in Washington.

99140 Solar Energy & Power

To learn more about solar energy and solar power in 99140, or for more solar-related resources for WA, check out the U.S. Energy Information Administration.