Lewis County, WA Climate

Lewis, WA County has a temperate climate all year round. Summers are warm and dry, with temperatures ranging from the mid-70s to the low 80s during the day and cooling down to the mid-50s at night. Winters tend to be cold with temperatures staying in the mid-30s during the day and dropping into the 20s at night. Rainfall is relatively low throughout most of the year, averaging around 28 inches annually. Snowfall is also minimal, generally occurring only during winter months and rarely reaching more than a few inches at a time. All in all, it's an ideal climate for outdoor activities year-round!

Lewis County, Washington gets 58 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Lewis County averages 17 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 138 sunny days per year in Lewis County. The US average is 205 sunny days.

Lewis County gets some kind of precipitation, on average, 167 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 78 degrees
Winter Low: the January low is 33
Rain: averages 58 inches of rain a year
Snow: averages 17 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Lewis County is 7.0 (10=best), which means it is less comfortable than most places in Washington.

9.1 Summer - 4.9 Winter

August, July and September are the most pleasant months in Lewis County, while December and January are the least comfortable months.

Climate	Lewis, Washington	United States
	58.0 in.	38.1 in.
	16.8 in.	27.8 in.
	167.1 days	106.2 days
	138 days	205 days
	77.9°	85.8°
	33.1°	21.7°
	7	7
	2.5	4.3
	1893 ft.	2443 ft.

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 Lewis County with an average high temperature of 78.8°, which ranks it as about average compared to other places in Washington. In Lewis County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lewis County are July, August and September.

In Lewis County, there are 7.3 days annually when the high temperature is over 90°, which is hotter than most places in Washington.

December has the coldest nighttime temperatures for Lewis County with an average of 32.1°. This is colder than most places in Washington.

In Lewis County, there are 68.9 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Washington.

In Lewis County, 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 Lewis County 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 Lewis County with 9.6 inches of rain, and the driest month is July with 0.9 inches. The wettest season is Spring with 39% of yearly precipitation and 8% occurs in Autumn, which is the driest season. The annual rainfall of 58.0 inches in Lewis County means that it is wetter than most places in Washington.

November is the rainiest month in Lewis County with 19.7 days of rain, and August is the driest month with only 5.1 rainy days. There are 167.1 rainy days annually in Lewis County, which is rainier than most places in Washington. The rainiest season is Spring when it rains 32% of the time and the driest is Autumn with only a 13% chance of a rainy day.

An annual snowfall of 16.8 inches in Lewis County means that it is snowier than most places in Washington. January is the snowiest month in Lewis County with 4.8 inches of snow, and 6 months of the year have significant snowfall.

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