Days of Sunshine Per Year in Washington

Number of Sunny Days

In the table below, the average number of Sunny Days for a city in Washington is the total days in a year when the sky is mostly clear. This includes the days when cloud covers up to 30% of the sky during daylight hours.

Partly Sunny Days have cloud covering from 40% to 70% of the sky during the daytime.

Total Days With Sun is a sum of the Sunny plus Partly Sunny days. The rest of the days are mainly overcast, with at least 80% cloud cover. All the numbers are annual averages, made from years of weather watching.

Annual days of sunshine
City Sunny Partly Sunny Total Days
With Sun
Olympia 52 84 136
Quillayute 51 75 126
Seattle 71 93 164
Spokane 86 88 174
Yakima 109 92 201

Amount of Sun

Here's another way to look at how much sunshine a city gets. The % Sun number measures the percentage of time between sunrise and sunset that sunshine reaches the ground. Again, these amounts are yearly averages based on many years of weather observations.

Percent sunshine yearly
City % Sun
Quillayute 33
Seattle 43
Spokane 55

National Climatic Data Center. Comparative Climatic Data.

Washington Sunshine
Back to Top