How much annual rainfall in portland oregon

The winter season is characterized by mild temperatures, cloudy skies, and rain. Winds are predominately either southerly with mild, rainy spells, or easterly during colder dry spells.

Outbreaks of cold arctic air from east of the Cascades will occasionally spill into the Portland area, bringing cold, blustery east winds. If the east winds occur when the rain is falling over the metropolitan area, a shallow layer of cold air forms along the Columbia River. In and near this cold sub-freezing air, freezing rain and even snow will occur over eastern and northern Portland.

Spring is a transitional time as the weather patterns shift from winter to summer. As a result, March and April are wet and cool, while May and June turn drier. Temperatures during May and June often take a roller coaster ride, ranging predominantly in the 60s and 70s, occasionally reaching the 90s for a day or two.

Even though the number of rain days decreases in May and June, there are still many cloudy days. Summer finally arrives in the middle to late June, when the temperature is finally able the reach the 80s on a daily basis.

Northwesterly winds bring cool air from the Pacific Ocean down along the Columbia River. Summer can be quite warm, with the temperatures frequently reaching the middle 90s, although these warm days do not last long before the cool marine air arrives with temperatures in the 70s. Temperatures above degrees are rare. Autumn is the reverse of spring, with many warm days in September.

By the middle of October, the rains are beginning to arrive. Also, cooler temperatures arrive, with afternoon highs in the 50s and 60s. Fog begins to occur on a nightly basis during late October and November, with visibilities often under one mile.

However, fog varies by location, with the difference frequently depending on the altitude. Hood Ski Resort Mt. Bachelor Ski Resort. Subscribe to Newsletter.

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Mesa Verde is not for summer visitors only. When are the longest days in Portland? The month with the longest days in Portland, Oregon, is June , with an average of What is the driest month in Portland? July is the month with the least rainfall in Portland, Oregon. Rain falls for 4. What is the month with the highest UV index in Portland? What is the warmest month in Portland? The warmest month in Portland, Oregon, is August , with an average high-temperature of What is the least humid month in Portland?

What month has the most sunshine in Portland? August has the most sunshine of the year, with an average of What is the coldest month in Portland? With an average high-temperature of What is the wettest month in Portland? December is the month with the most rainfall. Rain falls for What is the month with the shortest days in Portland? With an average of 8. Average temperature Portland, OR. Average high temperature in January : Average high temperature in July : Average low temperature in January : Average low temperature in July : Average pressure Portland, OR.

Average pressure in January : Average pressure in July : Average wind speed Portland, OR. Average wind speed in January : 5. Average wind speed in July : 4. Average humidity Portland, OR. Average rainfall Portland, OR. Average rainfall in January : 4. Thus, the water year ending September 30, is called the water year.

Department of the Interior U. Oregon Water Science Center. Location Map Click on the map below to open a full-screen map with links to each station.