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Climate in Oregon
(United States)

Average daytime and nighttime temperatures


All climate diagrams on this site result from the collected data from nine measuring weather stations in Oregon.
Weather stations at an altitude above 940m have not been included.
All data correspond to the average monthly values of the last 20 years.


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The climate widely corresponds to Central European weather conditions. It is cold, wet and a few beautiful summer months are also happening during a year.
Overview: Climate in the United States of America
Daylengths and sun positions in the United States of America
Compare climate with other regions or countries
Sunshine hours per day
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 11 hours per day, July is the sunniest month in the state of Oregon. In December, the sun shines the least.
Rain days per month
A rain day is a day on which at least 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 12 rain days, December offers the most rain days, while July has the fewest.
Precipitation amount in mm/day
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.2 mm, the least amount of rain falls in July. December, on the other hand, has the most rain.
Relative humidity in %
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture can be physically contained in the air. At high humidity, a person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% feels pleasant. With humidity averaging 83%, December is the most uncomfortable. In July, on the other hand, it is easier to endure.
Absolute humidity in g/m³
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy.
Humidex
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity, the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Map of Oregon

Most important cities in the federal state »Oregon«

The federal state has a west-east extension of about 590 km and over 460 km from north to south.

CityPopulationGeo position
Portland676,83145° 31' 24"N122° 40' 34"W
Salem167,41944° 56' 34"N123° 2' 6"W
Eugene166,57544° 3' 7"N123° 5' 12"W
Gresham111,52345° 29' 53"N122° 25' 53"W
Hillsboro105,16445° 31' 22"N122° 59' 23"W
Beaverton89,80345° 29' 13"N122° 48' 13"W
Bend76,63944° 3' 29"N121° 18' 55"W
Medford74,90742° 19' 35"N122° 52' 32"W
Springfield59,40344° 2' 46"N123° 1' 19"W
Corvallis54,46244° 33' 52"N123° 15' 43"W
Albany50,15844° 38' 11"N123° 6' 21"W
Aloha49,42545° 29' 39"N122° 52' 1"W
Tigard48,03545° 25' 52"N122° 46' 17"W
Lake Oswego36,61945° 25' 14"N122° 40' 14"W
Keizer36,47844° 59' 24"N123° 1' 34"W
Grants Pass34,53342° 26' 22"N123° 19' 50"W
McMinnville32,18745° 12' 36"N123° 11' 55"W
Oregon City31,85945° 21' 26"N122° 36' 24"W
Redmond26,21544° 16' 21"N121° 10' 26"W
Tualatin26,05445° 23' 2"N122° 45' 50"W
West Linn25,10945° 21' 56"N122° 36' 44"W
Woodburn24,08045° 8' 37"N122° 51' 19"W
Newberg22,06845° 18' 0"N122° 58' 23"W
Roseburg21,18143° 12' 59"N123° 20' 30"W
Forest Grove21,08345° 31' 11"N123° 6' 38"W
Klamath Falls20,84042° 13' 30"N121° 46' 54"W
Bethany20,64645° 33' 28"N122° 52' 3"W
Milwaukie20,29145° 26' 46"N122° 38' 21"W
Lents20,15645° 28' 47"N122° 34' 2"W
Ashland20,07842° 11' 40"N122° 42' 34"W


Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants: geonames.org, United Nations Statistics Division and own research.
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