Chehalis, WA Climate

Chehalis, WA has a mild climate throughout the year with warm summers and cool winters. The average temperatures in Chehalis during the summer months range from 70 to 85 degrees Fahrenheit while winter temperatures typically range between 35 and 50 degrees Fahrenheit. Most of the rainfall occurs during the winter months, with an average annual precipitation of about 40 inches. Snowfall is rare in Chehalis, only occurring on rare occasions. Despite this, Chehalis enjoys comfortable weather conditions year round due to its mild climate.

Chehalis, Washington gets 52 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Chehalis averages 2 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 136 sunny days per year in Chehalis. The US average is 205 sunny days.

Chehalis gets some kind of precipitation, on average, 171 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 34
Rain: averages 52 inches of rain a year
Snow: averages 2 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Chehalis is 7.2 (10=best), which means it is more comfortable than most places in Washington.

9.1 Summer - 5.3 Winter

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

Climate	Chehalis, Washington	United States
	51.7 in.	38.1 in.
	2.4 in.	27.8 in.
	171.0 days	106.2 days
	136 days	205 days
	78.4°	85.8°
	34.3°	21.7°
	7.2	7
	2.5	4.3
	243 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 Chehalis with an average high temperature of 79.5°, which ranks it as warmer than most places in Washington. In Chehalis, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Chehalis are July, August and September.

In Chehalis, there are 7.1 days annually when the high temperature is over 90°, which is hotter than most places in Washington.

December has the coldest nighttime temperatures for Chehalis with an average of 33.3°. This is about average compared to other places in Washington.

In Chehalis, there are 58.3 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Washington.

In Chehalis, 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 Chehalis 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 Chehalis with 8.5 inches of rain, and the driest month is July with 0.8 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 51.7 inches in Chehalis means that it is wetter than most places in Washington.

November is the rainiest month in Chehalis with 20.4 days of rain, and August is the driest month with only 5.1 rainy days. There are 171.0 rainy days annually in Chehalis, which is rainier than most places in Washington. The rainiest season is Spring when it rains 33% of the time and the driest is Autumn with only a 12% chance of a rainy day.

An annual snowfall of 2.4 inches in Chehalis means that it is less snowy than most places in Washington. February is the snowiest month in Chehalis with 0.7 inches of snow, and 3 months of the year have significant snowfall.