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Author Topic: Is it normal for US 101 to be 40 degrees cooler  (Read 2529 times)

roadman65

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Is it normal for US 101 to be 40 degrees cooler
« on: November 13, 2021, 10:32:01 AM »

I noticed in Oregon in this past July was 40 degrees cooler on US 101 compared to the temps on I-5. So when it was 105 in Portland it was 65 in Astoria.

Is this all year round like this?  I heard in CA the one side of the Coastal Range is a different climate than the other year round. Was wondering the same for Oregon.
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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #1 on: November 13, 2021, 10:55:20 AM »

That is normal.  101 is serviced by the world's biggest air conditioner.  We call it the Pacific Ocean!  Typical summertime highs on 101 in Oregon are in the mid 60's.

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Max Rockatansky

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #2 on: November 13, 2021, 11:31:06 AM »

Its pretty much like that during the summer along the entire west coast.  Even here in Central California it will often be something like 60-65F in San Francisco and over 100F an hour or so east in Stockton.
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jp the roadgeek

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #3 on: November 13, 2021, 11:33:03 AM »

Get a similar effect in the Spring in Boston when the wind is from the east.  It could be 85 in Worcester, 75 at 495, 65 by the time you get to 128, and 50 in the city.  Went to a Sox game in June. Left CT in shorts and needed a sweatshirt when I got there. 
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Max Rockatansky

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #4 on: November 13, 2021, 11:52:52 AM »

Get a similar effect in the Spring in Boston when the wind is from the east.  It could be 85 in Worcester, 75 at 495, 65 by the time you get to 128, and 50 in the city.  Went to a Sox game in June. Left CT in shorts and needed a sweatshirt when I got there.

In Florida the weather was actually more stable over the Gulf than it was inland.  The Florida Keys usually were somewhere between 75-90F all year whereas you could get potential freezing temperatures on mainland Florida in the winter. 

Interestingly on the West Coast the climate tends to equalize inland during the winter.  In the Central Valley of California this seems to be driven by all the cold air sinking in from the surrounding mountains which tends equalize the temperature with the coastal regions.
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Road Hog

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #5 on: November 13, 2021, 01:21:12 PM »

Its pretty much like that during the summer along the entire west coast.  Even here in Central California it will often be something like 60-65F in San Francisco and over 100F an hour or so east in Stockton.
You don't even have to leave greater Los Angeles to get the same effect. It can be 70 at the Santa Monica Pier and 105 in the San Fernando Valley simultaneously.
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Max Rockatansky

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #6 on: November 13, 2021, 01:27:54 PM »

Its pretty much like that during the summer along the entire west coast.  Even here in Central California it will often be something like 60-65F in San Francisco and over 100F an hour or so east in Stockton.
You don't even have to leave greater Los Angeles to get the same effect. It can be 70 at the Santa Monica Pier and 105 in the San Fernando Valley simultaneously.

Or even downtown sometimes.  The amount of climate difference you get on the first couple miles of I-10 often is drastic.
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Bruce

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #7 on: November 14, 2021, 01:58:28 AM »

The difference is only made greater by the coastal mountains, which help trap in some of the ocean systems.

jakeroot

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #8 on: November 14, 2021, 02:05:35 AM »

Yeah, this is a west coast thing. Ocean Shores, where a good friend of mine lives, is always way colder than here in the Seattle metro. Like, outdoor pools are dumb there, but could be justified here.
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bing101

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #9 on: November 24, 2021, 07:10:30 PM »


Its pretty much like that during the summer along the entire west coast.  Even here in Central California it will often be something like 60-65F in San Francisco and over 100F an hour or so east in Stockton.


Yes in Downtown San Francisco it would be clear and 70F but in South San Francisco it would be more foggier than downtown in the summertime at 60F.
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CoolAngrybirdsrio4

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #10 on: December 07, 2021, 04:04:18 AM »

I noticed in Oregon in this past July was 40 degrees cooler on US 101 compared to the temps on I-5. So when it was 105 in Portland it was 65 in Astoria.

Is this all year round like this?  I heard in CA the one side of the Coastal Range is a different climate than the other year round. Was wondering the same for Oregon.

Most likely has to do with the cool breeze from the Pacific.
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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #11 on: December 25, 2021, 03:41:59 PM »

It's normal for 101, right on the coast, to be cooler than I-5 during the spring, summer, and fall.  But, 101 is often warmer than I-5 during the winter.  The Pacific is a moderating influence about the low 50s F throughout the year, keeping the coast cooler in the summer but warmer in the winter.  Sometimes when I-5 over the Siskiyous is closed due to severe snowstorms it's still possible to drive along the coast.  If the coast isn't also impassible due to landslides.
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golden eagle

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #12 on: February 14, 2022, 02:10:09 PM »

When I lived in San Diego, it could be 75 in downtown, but 20 degrees warmer in El Cajon, about ten minutes east of downtown.
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TheHighwayMan394

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #13 on: February 14, 2022, 02:17:15 PM »

The temperature gradients aren't that extreme, but it can happen on a smaller scale in pockets of the Great Lakes, like in Duluth where it can be 10-15 degrees warmer at the airport/mall up on the hill than in downtown/Canal Park depending on various factors.
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Bruce

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #14 on: February 14, 2022, 03:17:51 PM »

A good illustration of the temperature difference, from the peak of Eastern Washington's heat wave on June 29:



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SectorZ

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #15 on: February 14, 2022, 03:31:03 PM »


120 degrees at that latitude is just bonkers. That's the same latitude on the East Coast as Caribou, ME, which has a record high of 96 degrees, and Caribou has a strong continental climate despite how close it is to the Atlantic. Almost the same elevations to boot.
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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #16 on: February 14, 2022, 03:34:46 PM »

(removing really tall quote)

120 degrees at that latitude is just bonkers. That's the same latitude on the East Coast as Caribou, ME, which has a record high of 96 degrees, and Caribou has a strong continental climate despite how close it is to the Atlantic. Almost the same elevations to boot.

It appears based on a quick look on Wikipedia that that area is much drier than the East Coast.
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US 89

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #17 on: February 14, 2022, 05:15:25 PM »

(removing really tall quote)

120 degrees at that latitude is just bonkers. That's the same latitude on the East Coast as Caribou, ME, which has a record high of 96 degrees, and Caribou has a strong continental climate despite how close it is to the Atlantic. Almost the same elevations to boot.

It appears based on a quick look on Wikipedia that that area is much drier than the East Coast.

Well sure, but even in low-altitude dry areas, 120 is insanity that far north. It is well known that the inland Pacific Northwest is a dry, low-elevation place that gets damn hot in summer...but not that hot. All-time record highs in that area are largely in the low 110s range and were generally a few degrees lower before that heat wave in particular.

That heatwave really has no parallels anywhere in the historical record. Places were shattering their all-time record highs by 5 or 10 degrees in some locations. In Portland, for example, the previous all-time record was 107 set on multiple occasions, but they recorded their three hottest max temperatures ever on June 26-28 of last year (highs of 108, 112, and 116).

Bruce

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #18 on: February 14, 2022, 09:56:10 PM »

(removing really tall quote)

120 degrees at that latitude is just bonkers. That's the same latitude on the East Coast as Caribou, ME, which has a record high of 96 degrees, and Caribou has a strong continental climate despite how close it is to the Atlantic. Almost the same elevations to boot.

It appears based on a quick look on Wikipedia that that area is much drier than the East Coast.

It's not uncommon for places in the Tri-Cities to reach up to the triple digits every summer, but only on the low end.

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #19 on: February 22, 2022, 01:17:52 AM »

my house is always 4 degrees cooler than literally a mile away south or east

Scott5114

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Re: Is it normal for US 101 to be 40 degrees cooler
« Reply #20 on: February 22, 2022, 05:23:46 AM »

my house is always 4 degrees cooler than literally a mile away south or east

That's nothing. During the summer, my house is always about 30 degrees cooler than literally 50 feet south or east.

Then again, that's mostly because I run the air conditioner.
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