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The Pacific Northwest Climate - Oceanic or Mediterranean?

The Pacific Northwest Climate - Oceanic or Mediterranean?

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The Pacific Northwest of the United States and Canada. A wonderland of nature. Epic scenery - breath-taking mountains, endless forests, windswept beaches, even volcanoes. And the amazing cities of Vancouver, Seattle, Portland and Victoria that have influenced the wider world far beyond their isolated patch along the wild Pacific coast. And- it is somewhat well known for its weather too. Dominated by wet winter westerlies blowing in from the Pacific each year, its exposed coasts feature some of the highest rainfall in the world, and sport temperate rainforests. Individual areas within the Pacific Northwest vary in terms of rainfall. British Columbia is cooler and wetter than Washington State, and in turn with Oregon. In the first of my Climate Casebook series, I look at the curious case of the Pacific NW Climate. Is it Oceanic like Britain? Or is it more like a Mediterranean climate with its dry summers? The Pacific Northwest climate is actually a hybrid of the classic Mediterranean hot dry summers / wet winters pattern, and the Oceanic mild summers and rain all year round. It has very similar winter and summer temperatures to England, but it has the wet winter and dry summer patterns of California. Oceanic temperatures meets Mediterranean rainfall patterns. Additional Charts, Maps and Images along with the narrative script
Date: 2024-01-04

Comments and reviews: 35


Humans need to categorize things, but the west coast Of North America is a continuum falling between modified Mediterranianan (Southern CA and full maritime temperaate (Northern BC) climate systems, where warm dryness dominates more the further south, and cool, wetter weather dominates more the further north one goes.
What makes the west coast of North America different from western Europe is a twofold distinction: a cold upwelling that dominates off CA AND a continuous chain of mountains very close to and parralelling the shore, allowing air cooled and humidified by the cold upwelling to become deep and persistent during the -warm- months, with San Francisco being the best known example. There is no climate zone in Europe that has the coastal California type Summer fog/permanent marine layer.
L. A, Eureka, and Astoria also have the cool marine layer taking a big chunk out of their sunshine from May to August: Although the marine layer does not produce meaningful rainfull as it is under stable High Pressure and capped by an inversion layer, it maintains cool and humid conditions that mimic much more Oceanic areas to the North, Allowing coastal redwood and southern mixed evergreen forests to thrive This deep marine layer is the dominant climatic feature of coastal CA in the Summer: again, to emphasize; no such feature exists in Mediterranian Europe.
These two factors are what make both coastal California and the PNW distinct from their corresponding -zones- in Europe, but also from the -classic- mediterranian and Oceanic climate schema defined by Koppen.
Those coastal cordillera are why the interior of the PNW (Seattle, Portland) experience warmer, dryer summers than are found at the same latitude in western Europe and Great Britain, where moister, cooler air can flow inland unobstructed. there are other minor factors as well.
In the sense of these main differences, both CA and the PNW are hybrid climate zones, with increasing distance from the water as well as latitude being major factors in whether -dry and warm- or -cool and damp- dominate, but the crest of the coast range is the only -hard- boundary, and not the latitude.

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Born raised in Corvallis Oregon since 1989. It's my favorite thing ever when it's kind of stormy or cloudy foggy rainy days I love exploring our forest's in that weather. As of these last few years tho the climate has been like we live in lower California tho, it's way drier, it gets way hotter now, seasons are different, we used to have very noticeable springs and now it just go from light winter to feels like our old summers and now the summer summer is way hotter then it used to be most of my life of 32 yrs. Mostly it just doesn't rain as frequently thru the year minus summer like it used too. I hope we can keep our temperate lush rainforest ecosystems Because I love our forest's, moss, fungi, lichen, ferns, dense wilderness everywhere. Its literally my favorite thing in the world and it got me into photography when I got sober and overcame some past addictions I just happened to find going out and taking photos was a very therapeutic thing for me to do not just physically but mentally and with my 2 dogs it's a great exploration experience each time lol -
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Great video! I have lived in the Seattle metro area my whole life. I have always thought that our summers were definitely Mediterranean. Thank you for the graphs showing that we are actually Mediterranean all year. Our winters are wet and cloudy but it is a light rain not a heavy rain usually. The temperatures are usually very mild. Snow at sea level is pretty rare. There are some people that wear shorts year round here. It-s amazing the variety of plants we can grow this far north in our mild climate. I absolutely love our dry warm summers. So glad we don-t get the hot humid weather that they do in the eastern United States. Feel very blessed to live in such a beautiful place. Coming home from trips or vacation by plane is always a delight. The snowcapped volcanoes and the greenery with the waters of Puget sound are breathtaking. There is no other place like it. It will always be home to me.
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In Southern Oregon, it gets hotter here in summer than it did in LA, where I was born and raised. In mid May, we start hitting 90's, fact check Medford Oregon/rogue valley summers. Come summer, we expect Temps 95-100 on average. Every summer we hit a stretch of days that are in the 1-teens. We hardly ever have thunderstorms here because we don't get rain, or clouds really in summer, which is the only time we might have one. Anybody can tell you, if we have thunderstorms, 90% chance they are going to be around memorial day, and I've only had1 decent t-storm since moving here in 98. They're laughable compared to what we got when I was stationed in mississippi. After memorial day, it's just hot and sunny until the beginning of october. The coast always is cold and rainy though. When the weather's crappy inland, then it's nice on the coast
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Great Video. One minor, yet important point: the Pineapple Express that you refer to is a sub-tropical feature which originates from the southwest, rather than the west. In fact it often originates from somewhere near Hawaii, hence the name. The Pineapple express is more correctly referred to as an atmospheric river and is mostly responsible for the extreme rainfall/flooding events that make the national news. On a related note, I am due to move to Regina, SK, from Victoria, BC in six days. This is happening partly because I found a job there, partly because the cost of living is lower in Saskatchewan than in British Columbia and finally, because I find the rainy winters of the Pacific Northwest hard to take. I'll take cold sunshine over warm rain anytime.
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I grew up near the coast in southwestern Washington, and I've always loved the forest.
We get more than twice the amount of rain here than in Seattle. We can go over a week at least without a break from the rain. I hated it until I moved with my dad throughout southern California for a few years. People thought I was nuts to hate the rain since they hardly got any there. And being in a very hot area near palm springs, I got sick of the sun, heat and lack of trees.
Then last year I've moved back to Southwestern Washington and I've appreciated the rain so much. I still get a little bored with it after a while, but I appreciate it more than I ever did. I know this comment was long, I just wanted to share it with the web.

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Portland here. I love the summers. Endless warmth and sun. Not fond of the winters, quite wet and dreary. I will say that the summers over the last 10 years have been less warm and more hot. Portland regularly has days in the 90F-s (+32C) and it-s not uncommon to hit higher than 100F (+38C. In fact, Portland now has a record high temperature higher than LA. I personally like the hot weather as it makes for great pool weather, but our fire season (September through October) has gotten noticeably worse. We tend to spend several weeks a year now with hazardous air quality due to the smoke. I think every place is experience something different due to climate change. Great videography, by the way!
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Lived in Vancouver BC most of my life. When I traveled to London a few years back I found myself constantly putting on and taking off my jacket (May) and having the rain start and stop constantly. This was quite foreign to me because over here the weather changes slowly. I can see clouds approaching from the south west and know I have about 1-3 hours before the rain starts. And generally it will rain for at least most of the day after that. In winter the rain might not stop for several days and just go from light to heavy to light etc.
During the heat wave last year we didn't get rain for something like 45 days and I was so happy to sit in a chair outside when it finally did.

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So this region has an oceanic climate bordering on mediterranean, or vice versa. Also I think you should put into account the precipitation pattern and the number of rainy days as opposed to precipitation quantity: except for summer, the precipitation pattern of these Pacific Northwest cities is even more oceanic than London. Vancouver has at least 15 days of rain per month from October to April while London averages 10 days of precipitation per month for that period of time. Conversely Los Angeles has barely 6 days of rain per month from December to March, its wettest months.
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Lived most of my 68 years in the PNW, and still find it difficult to exactly classify the overall climate, ( which is in transition, globally. I have heard it called maritime, but also heard it called mediterranean. What I can add is that within the overall climate, because of local topography, there are variations of microclimates. For example: I live approximately 20 miles east of Mount Vernon, Washington, on the upper end of the Skagit Valley. It can be dry and sunny in Mt. Vernon, but be pouring rain in my locale, and vice versa in Mt. Vernon.
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I love the winters especially the cold snowy ones that leave a good snowpack for the dry season here on the east slope of cascades. The west slope is an hybrid with a strong oceanic dominance especially on both the cascade and Olympic slopes, especially western and Northern aspects. Pockets displaying a more mosaic pattern, leaning more Mediterranean, are readily found throughout the area with an increasing dominance as one moves easterly across the eastern slope into the head of the Great basin to the southeast.
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Los Angeles is just barely Mediterranean. Just as the Pacific Northwest lies on the edge between Mediterranean and oceanic (closer to oceanic in the north and Mediterranean in the south, LA is on the border between Mediterranean and semi-arid. Portland Oregon has a more extreme dry summer season than parts of the Mediterranean. And yes, I mean areas around the Mediterranean Sea that are classified as Mediterranean. It's laughable how southern Californians seem to think they are the epitome of a Mediterranean climate.
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good video but the region isn't really known as the pacific north west in Canada as its in the southwest of the nation and considering BC is bigger than all west coast American states we are more in the middle, or we could be in the continental northwest but then California would also be in the northwest. but yah I live in Victoria BC and I never got why people would always say oh the west coast is so rainy yet we would be having a draught. so I found the global perception of the region weird
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I just want to thank you and congratulate on the very interestong videos and content. I know how hard it is for this to be made. I am also a climate enthusiast. I am in a climate similar to London, UK, but the winters are colder here and summers are warmer. I do like the sunny Summers of the Pacific NW, but i do like the precipitation we get in Summer so i don't have to irrigate my plants much. I am jelaous of midl winters of London and Pacific NW. But my winters are warming do to the global warming.
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I have lived in Spokane Washington for almost all my life and I have to say that Mnt. Sainthelon. explosion happened I was about 12yrs old the weather sucked for months, now I'm looking at a real chance of the end soon and with a 80% fact happening now Yellow Stone Park'' valcano'', looks like a great chance for it becoming real quick like as 1yr, I'm just waiting I'm calling out chances of a year now this to happen
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Even more intriguing are the pockets of Csa (hot Mediterranean) climate east of the Cascade Mountains, including my hometown of The Dalles. It's basically semiarid but with somewhat damp winters and temps slightly above freezing in December & January most years. This area is almost certainly the northernmost Csa zone in the world, even if it just barely qualifies. Kind of like the humid subtropical in NYC!
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I live in seattle, I love it here, but as with many other residents I am not so thrilled about the rain in terms of my experience. I do really love how rainy it is in terms of the wildlife that can exist here, especially the dry summer/wet winter situation which has favored conifers over deciduous trees, I love our western redcedars, hemlocks, and Douglas firs
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Portland is similar latitude as northern Italy, parts of Slovenia and Croatia. That part of Europe is very rainy and i always believed those 2 places on the globe have similar climate. Can someone compare weather and climate between Portland, Oregon with cities like Venice, Trieste (italy) and Rijeka or capital Zagreb (croatia. That comparison would be great
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Thank you for making this video. Too many people insult the PNW purely because of our winters. This area is more than just rainy winters. In fact, it's because of those rainy winters that we have such beautiful summers. Our plant life stays lush and green in Summer because of all the rain we get. I've lived in Oregon all my life and I love it.
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The extreme is San Francisco, where temperatures vary little throughout the year and rainfall is completely absent in the summer. That is Csb, and the difference between San Francisco and the more northerly cities is that San Francisco looks subtropical with palm trees.
With global warming, London is likely to go Mediterranean.

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Having lived my entire life on the west coast I was embarrassingly old before I discovered that wet winters and dry summers are not only not normal for everyone but are actually somewhat of a global rarity. Anything shared by both San Diego and Seattle must be the standard since they're so dissimilar otherwise. Nope!
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I live in a tiny outpost of this climate (Csb) at elevation on the leeward slopes of Haleakala Volcano in Kula, Maui. It's a heavenly climate. At the summit of Haleakala is the exceedingly rare Cold Summer Mediterranean (Csc) climate. I hope you do a video on that one too. These are really well done videos
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Rough guide to climate zones, north to south:
Northern BC- Scottish/ Norwegian
Southern BC- English/ Scottish
Maritime Washington State- Northern French/English
Maritime Oregon- French
California north of Mendocino- Southern French/ Northern Italian (Milan, Turin, Po Valley)
Bay Area- Mediterranean

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If you look closely, the landscape between Hood River and The Dalles actually resembles a Mediterranean dry woodland. Lots of pine and oak, with spring wildflowers and dried-out summer grasses.
It's too cold for palms or citrus to grow there, but at least the native vegetation looks similar.

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I grew up near San Diego and have lived near Seattle for most of the last 20 years. I agree that the whole west coast from Baja California to British Columbia feels like one continuum of the same climate with precipitation increasing and temperature decreasing gradually as you move north.
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We can grow Mediterranean crops here to some extent--having a good southern exposure being very important. I'm in Western WA and have fig trees, table grapes (wine grape country is Eastern WA) olive trees alongside apples, pears, quince, and plum. What would you call that--Cascadoceaterrean?
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Mediterranean climate, means you live near the Mediterranean Sea. And it means your climate is influenced by the Mediterranean Sea. While you may feel other regions have similar climates, I must disagree. Anywhere outside of the Mediterranean region does not have a Mediterranean climate.
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Mediterranean. I don-t think rainfall amounts matter that much as long as the winters are sufficiently wet and summers are reliably dry. Especially when the wettest place in Europe has a Mediterranean climate and places in northern California get over 100 inches of rainfall a year.
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I live in the rainshadow of the Olympic Mountains in Washington where the summers are drier than Tempe, AZ and annual precipitation is less than coastal communities north of So Cal. It is more Mediterranean than most of the coast minus the temps. Cool video!
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I love everything about Seattle weather. I enjoy the wet rainy season. Summers are good for outdoors. Rain and winter to stay put and do some intense work, tucked next to a window, watching the rain and sipping hot coffee. East or West, Seattle is the best -
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Portland here, I actually love the winter and hate the summer. It's mild and rainy much of the year so we're not used to the short/warm summers. By the time we adjust, winter is back. Also all the recent fire seasons makes me never want to see the sun again.
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It is a temperate oceanic climate. The rainfall levels throughout the autumn/fall through to spring are far too high and temperatures lower than that of a Mediterranean climate. The Mediterranean climate is found further south along the US west coast
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Been living in Seattle since 1998. Love the climate here. 30 minute drive and there are ski slopes with lots of snow in the winter, then drive back to town and voila, no snow! rains in the winter but locals don't even buy or carry umbrellas.
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Born & raised in San Diego, CA and now live just outside of Tacoma & I love the PNW climate. The summers are gorgeous, and the greenery the rains bring is totally worth it-. Winter Scuba diving in the Puget Sound is incredible too!
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I live in Northern Portugal and I can confirm that compared to the rest of the country or even most of Spain, the weather here is alot cooler and more humid, sometimes the country might be experiencing a drought but never here
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