Washington Sunlight Hours & Renewable Energy Information

Washington Sun Light Hours Map

Quick Green Energy Summary for Washington


State Sunlight Rank: 49/50

Average Annual Sunlight Hours: 2100 hours

Clear Days: 58 days per year

Summer Peak Sun Hours: 4.83 hours per day

Winter Peak Sun Hours: 1.6 hours per day

Average Peak Sun Hours : 3.57 hours per day


State Wind Rank : 40/50

Average Annual Wind Speed: 0.04 miles per hour

More Information on Washington Green Energy

The state of Washington ranks very low in average peak sun hours per day in the United States, but is a perfect example of a state who does not let low hours of sunshine keep it from exploring the benefits of solar power. Installed capacity in Washington has increases every year over the past decade and is predicted to rise further. Where Washington lacks in solar power capacity, it makes up for in wind turbine installed capacity, coming in among the top ranked states in the country with installed wind capacity.

The evergreen state, beautiful forest and mountains and cities knows that more renewable and clean energy will be the future of this great state. Where peak sun hours lack, the drive to have a better future prevails and continues to grow into new renewable energy projects.

It is important to remember, if you are looking to install solar panels then you have to understand that not every hour of sunlight will be converted at the same efficiency ratio. Certain factors such as time of year, the angle of both the sun and panels, varied cloud coverage, tracking mounts, or if you are using the system year round are just a few of the factors that could affect efficiency ratios.

Because of this you should look at average of peak hours of sunlight per day, which are the most ideal sunlight hours of solar insolation.

Washington receives an average of 3.57 peak sun hours a day on a fixed solar panel.