Climate in Seattle, Washington

Seattle, Washington gets 38 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Seattle averages 5 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 152 sunny days per year in Seattle. The US average is 205 sunny days.

Seattle gets some kind of precipitation, on average, 155 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highs & Lows

Summer High: the July high is around 76 degrees
Winter Low: the January low is 37

SPERLING'S COMFORT INDEX

Seattle ranks 79/100 for Comfort Index

A higher score indicates a more comfortable year-round climate. The US average for the comfort index is 54. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

August is the hottest month for Seattle with an average high temperature of 76.3°, which ranks it as cooler than most places in Washington. In Seattle, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Seattle are August, July and September.

December has the coldest nighttime temperatures for Seattle with an average of 35.9°. This is one of the warmest places in Washington.

In Seattle, there are 1.7 days annually when the high temperature is over 90°, which is cooler than most places in Washington.

In Seattle, there are 24.0 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Washington.

In Seattle, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Washington.

November is the wettest month in Seattle with 6.2 inches of rain, and the driest month is July with 0.8 inches. The wettest season is Spring with 39% of yearly precipitation and 9% occurs in Autumn, which is the driest season.

The annual rainfall of 38.0 inches in Seattle means that it is about average compared to other places in Washington.

An annual snowfall of 4.6 inches in Seattle means that it is about average compared to other places in Washington.

December is the snowiest month in Seattle with 2.1 inches of snow, and 4 months of the year have significant snowfall.

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