On average there are Climate Oregon United States of America. Oregon are in the northern hemisphere. The best time to visit are July, August. Oregon in January. Oregon in February. Oregon in March. Oregon in April.
This variation in precipitation also produces a similar irrigation projects in recent years have converted thousands of acres of semi desert areas into highly productive farmland. The state as a whole has a very definite winter rainfall climate.
West of the Cascades about one-half of the annual total precipitation falls from December through February; about one-fourth in the spring and fall and very little during the summer months.
East of the Cascades the differences are not as pronounced with slightly more precipitation in winter than in spring and fall, while only about 10 percent falls during the summer.
Along the coast the normal annual total is from 75 to 90 inches, and increases up the west slopes of the Coast Range to almost inches near the crest. Amounts decrease on the eastern slopes and in the Willamette Valley. On the western slopes of the Cascades there is again a marked increase in precipitation with elevation as annual averages range up to 75 inches. Amounts decrease rapidly on the east side. The annual average precipitation with elevation as annual averages range up to 75 inches.
The annual average precipitation for the great plateau of the state is often less than eight inches. In the Columbia River Basin and the Blue Mountains, totals are about 15 to 20 inches; however, some of the mountain regions receive as much as 35 inches. In the high Cascades, where the state's heaviest snowfalls occur, there are few official observing stations.
Considerable reliance must be placed on measurements obtained on various snow courses. It appears that annual average totals can range from t inches. A maximum annual snowfall of inches and a snow depth of inches has been officially recorded at Crater Lake National Park headquarters. Winter precipitation along the Coast Range, due to its lower elevations, occurs largely in the form of rain, although it too is occasionally subject to very heavy snows.
In the Blue Mountains, seasonal totals range between to inches and depths on the ground may occasionally exceed inches, but during most years the greatest recorded snow depths are less than inches. The periods of continuous snow cover very with elevation.
On the peaks of the Cascades higher than 7, feet above sea level it persists in glacial form the year around. In most mountain areas above 4, feet snow cover lasts from early December until the latter part of April. Snow courses aberages show that above 4, feet, snow depths again varying with elevation are approximately 50 to inches in the Cascades, 25 to 65 inches in the Blue Mountains at the end of January; 60 to inches and 25 to 70 inches, respectively, at the end of February; 75 to inches and 25 to 80 inches at the end of March; 40 to inches and five to 45 inches at the end of April.
Along the coast the average annual snowfall is only one to three inches, with many years in which there is no measurable amount. In the inland western valleys most yearly totals average between 10 to 15 inches, with snow on the ground seldom lasting more than two to three days at a time. In north-central Oregon the annual average is 15 to 30 inches, while over the higher plateau region that makes up the south-central portion snowfall ranges up to as much as 60 inches.
In the valleys of the northeast 40 to 75 inches is normal, while in the Snake River Basin which makes up most of the southeast it is only 15 to 40 inches. Every few years some part of the state, with the possible exception of the coastal areas , may be visited by heavy snowstorms which even in the Willamette Valley can produce 20 to 25 inches in a hour period. Hailstorms occur each year, but are generally light and cover very small areas.
They cause thousands of dollars damage annually to crops with much lesser damage to buildings. Practically all of these storms occur east of the Cascades. In the western part of the state thunderstorms occur in the valleys an average of four to five days a year and are not usually severe. In the eastern part, they occur on 12 to 15 days with heavier precipitation and greater wind damage; however, total losses are not extensive.
It is in the mountain areas that these storms occur most frequently and each year many forest fires are started by the accompanying lightning. Several times each year winds of hurricane force 74 m. They sometimes move inland to the western valleys and up the Columbia Gorge. At Portland, gusts with instantaneous speeds of 75 to 80 miles per hour are occasionally observed. Damage is usually confined to power and communication lives, to some crops, and to outdoor signs, and timber.
Very rarely does loss of life or major structural damage to buildings result. The few tornadoes reported have been short lived. The prevailing wind direction is influenced by the surrounding terrain. In the Columbia Gorge, for example, the prevailing direction of the wind follows the orientation of the gorge at that point. Similarly, in the Willamette Valley prevailing directions are aligned north-south with the valley. The very strong winds, of course, are determined by the directions of the major storm movements.
Record Driest year in Oregon from - , avg precipitation Driest location ranked by lowest annual average precipitation: Fields, southeastern Oregon, 6. Wettest location ranked by highest annual average precipitation: Valsetz, northwestern Oregon, Snowiest location ranked by highest annual average snowfall: Crater Lake, southwestern Oregon, State precipitation record for 1 year - Laurel Mountain, northwestern Oregon, , 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. Start Your Review of Oregon. Members receive 10 FREE city profile downloads a month, unlimited access to our detailed cost of living calculator and analysis, unlimited access to our DataEngine, and more.
Enhanced Cost of Living Calculator Now includes childcare, taxes, health, housing for home owners vs renters, insurance costs and more when you upgrade to premium. Log In Sign Up. Climate in Oregon. Oregon averages 13 inches of snow per year.
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