Multnomah County, OR Climate

Multnomah County, Oregon has a mild climate. Summers are characterized by warm days with temperatures reaching into the 80s and 90s, while winter temperatures rarely dip below freezing. Rainfall is distributed throughout the year, with most of it falling during the cooler months. While this county does not have a true “dry season”, it does experience some seasonal changes in precipitation; December and January tend to be wetter than the other months of the year. These conditions create a great environment for outdoor activities all year round and provide ample opportunities for recreation in nature.

Multnomah County, Oregon gets 45 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Multnomah County averages 3 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 142 sunny days per year in Multnomah County. The US average is 205 sunny days.

Multnomah County gets some kind of precipitation, on average, 158 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 80 degrees
Winter Low: the January low is 36
Rain: averages 45 inches of rain a year
Snow: averages 3 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Multnomah County is 7.5 (10=best), which means it is more comfortable than most places in Oregon.

9.4 Summer - 5.5 Winter

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

Climate	Multnomah, Oregon	United States
	44.8 in.	38.1 in.
	2.7 in.	27.8 in.
	157.9 days	106.2 days
	142 days	205 days
	80.1°	85.8°
	36.1°	21.7°
	7.5	7
	3	4.3
	968 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 Multnomah County with an average high temperature of 80.8°, which ranks it as cooler than most places in Oregon. In Multnomah County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Multnomah County are July, September and August.

In Multnomah County, there are 11.4 days annually when the high temperature is over 90°, which is cooler than most places in Oregon.

December has the coldest nighttime temperatures for Multnomah County with an average of 35.2°. This is warmer than most places in Oregon.

In Multnomah County, there are 31.8 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Oregon.

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

Humidity in Multnomah 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.

December is the wettest month in Multnomah County with 7.0 inches of rain, and the driest month is July with 0.7 inches. The wettest season is Spring with 41% of yearly precipitation and 8% occurs in Autumn, which is the driest season. The annual rainfall of 44.8 inches in Multnomah County means that it is wetter than most places in Oregon.

November is the rainiest month in Multnomah County with 19.5 days of rain, and August is the driest month with only 3.8 rainy days. There are 157.9 rainy days annually in Multnomah County, which is rainier than most places in Oregon. The rainiest season is Spring when it rains 34% of the time and the driest is Autumn with only a 11% chance of a rainy day.

An annual snowfall of 2.7 inches in Multnomah County means that it is less snowy than most places in Oregon. December is the snowiest month in Multnomah County with 0.9 inches of snow, and 3 months of the year have significant snowfall.

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