Umatilla County, OR Climate

Umatilla, OR County has a semi-arid climate with warm summers and cold winters. The average temperature in summer is around 78°F and can reach up to 100°F during the hottest days of the year. Winters tend to be cold with temperatures averaging around 39°F. Rainfall is generally light throughout the year, with an average of 10 inches per year. Snowfall is also light, usually totaling just over 6 inches annually. The area typically receives plenty of sunshine, making it an ideal spot for outdoor activities like camping, fishing, and hiking.

Umatilla County, Oregon gets 16 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Umatilla County averages 14 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 192 sunny days per year in Umatilla County. The US average is 205 sunny days.

Umatilla County gets some kind of precipitation, on average, 100 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 88 degrees
Winter Low: the January low is 27
Rain: averages 16 inches of rain a year
Snow: averages 14 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Umatilla County is 7.3 (10=best), which means it is more comfortable than most places in Oregon.

8.9 Summer - 5.1 Winter

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

Climate	Umatilla, Oregon	United States
	15.5 in.	38.1 in.
	14.0 in.	27.8 in.
	99.5 days	106.2 days
	192 days	205 days
	88.4°	85.8°
	26.9°	21.7°
	7.3	7
	3.2	4.3
	2626 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.

July is the hottest month for Umatilla County with an average high temperature of 88.4°, which ranks it as warmer than most places in Oregon. In Umatilla County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Umatilla County are September, June and May.

In Umatilla County, there are 33.9 days annually when the high temperature is over 90°, which is hotter than most places in Oregon.

December has the coldest nighttime temperatures for Umatilla County with an average of 25.7°. This is colder than most places in Oregon.

In Umatilla County, there are 108.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Oregon.

In Umatilla County, there are 1.7 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Oregon.

Humidity is low in Umatilla County, and some people might find the dryness to be uncomfortable. Days with noticeable humidity are rare throughout the year. A very dry climate can lead to cracked, itchy skin and dry eyes.

November is the wettest month in Umatilla County with 2.0 inches of rain, and the driest month is July with 0.4 inches. The wettest season is Spring with 33% of yearly precipitation and 13% occurs in Autumn, which is the driest season. The annual rainfall of 15.5 inches in Umatilla County means that it is drier than most places in Oregon.

November is the rainiest month in Umatilla County with 12.6 days of rain, and August is the driest month with only 2.8 rainy days. There are 99.5 rainy days annually in Umatilla County, which is less rainy 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 13% chance of a rainy day.

An annual snowfall of 14.0 inches in Umatilla County means that it is snowier than most places in Oregon. December is the snowiest month in Umatilla County with 4.7 inches of snow, and 5 months of the year have significant snowfall.

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