Zip 98040 (Mercer Island, WA) Climate

Mercer Island, WA 98040 has a moderate climate characterized by mild temperatures throughout the year. The average high temperature in the summer is about 77°F (25°C) and the average low temperature in winter is about 36°F (2°C). Rainfall is quite common during the winter months, with an average of over 37 inches per year, while snowfall is rare and usually happens only a few days each season. Overall, Mercer Island provides an enjoyable climate with plenty of sunshine for outdoor activities and exploration.

Mercer Island (zip 98040), Washington gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Mercer Island (zip 98040) averages 5 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 140 sunny days per year in Mercer Island (zip 98040). The US average is 205 sunny days.

Mercer Island (zip 98040) gets some kind of precipitation, on average, 153 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 Highlights

Summer High: the July high is around 76 degrees
Winter Low: the January low is 37
Rain: averages 39 inches of rain a year
Snow: averages 5 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for the 98040 zip code is 7.5 (10=best), which means it is one of the most pleasant places in Washington.

9.5 Summer - 5.6 Winter

August, July and September are the most pleasant months in the 98040 zip code, while December and January are the least comfortable months.

Climate	Mercer Island, Washington	United States
	Unlock	38.1 in.
	5.1 in.	Unlock
	Unlock	106.2 days
	140 days	Unlock
	76.0°	85.8°
	Unlock	21.7°
	7.5	Unlock
	Unlock	4.3
	141 ft.	Unlock

Climate

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 the 98040 zip code with an average high temperature of 76.5°, which ranks it as about average compared to other places in Washington. In the 98040 zip code, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for the 98040 zip code are August, July and September.

In the 98040 zip code, there are 1.8 days annually when the high temperature is over 90°, which is cooler than most places in Washington.

December has the coldest nighttime temperatures for the 98040 zip code with an average of 35.7°. This is one of the warmest places in Washington.

In the 98040 zip code, there are 25.4 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Washington.

In the 98040 zip code, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Washington.

Humidity in the 98040 zip code is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are August, July and September.

November is the wettest month in the 98040 zip code with 6.3 inches of rain, and the driest month is July with 0.9 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 39.2 inches in the 98040 zip code means that it is about average compared to other places in Washington.

November is the rainiest month in the 98040 zip code with 18.5 days of rain, and August is the driest month with only 5.0 rainy days. There are 152.7 rainy days annually in the 98040 zip code, which is about average compared to other places in Washington. The rainiest season is Spring when it rains 33% of the time and the driest is Autumn with only a 13% chance of a rainy day.

An annual snowfall of 5.1 inches in the 98040 zip code means that it is about average compared to other places in Washington. December is the snowiest month in the 98040 zip code with 2.2 inches of snow, and 4 months of the year have significant snowfall.

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