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Any of the Australian coastal cities facing the Southern Ocean are prone to huge fluctuations in the summer months. Competing systems of deep Polar lows and blocking highs drawing desert heat south can impact summer temps within the space of a day or 2. Melbourne and Adelaide can see a 20c drop in temps after the passage of a cool change on a heatwave day. Even Sydney is renowned for the 'Southerly Busters' roaring up the east coast and dropping the temp by 15c or more.
Albany in WA has a unique climate by Austalian standards with its location on the southern tip of Western Australia, thus the Roaring 40's keeping the climate cool all year round, except with a blocking high to the east, the winds turn hot north easterly and every now and then +30c temps happen in winter and some summers don't exceed 30c. But when they do, its into the 40's. Even Hobart in Tasmania is not immune to temps in the 40's when hot northerlies create heatwave and extreme fire conditions..
I've been to the Football ( Aussie Rules in Melbourne in April ( 30c ) and May (25c ) and Cricket in December in the low 40's and another time 16c, cold, wet and an icy wind. Melbourne truely has a '4 season in one day' climate all year round.
Believe it or not, north Texas can get pretty rowdy with temperature fluctuations. We've seen it a lot around here, it isn't just hot. Walked into a grocery store one morning at about 8am and the temperature was 75 and muggy. Walked out one hour later and the temperature had dropped almost 30 DEGREES and a dry wind was starting to howl down from the north. We've seen the most interesting temperature changes and weather spells here in Texas (we're originally from So Cal) in the last 5 years and have come to rather enjoy it. It's crazy to drop your kids off at school early in the morning and it's shorts and t-shirt weather and by the time you pick them up it's time to drag out the boots and fleece again, LOL.
I think the question was summers with extreme temp fluctuations. I have lived north and south of North Texas. Once you get into summer its just hot or hotter. There is really nothing that will change that much. Eventually in late summer or early fall you will get your first cold front. The other seasons you can have cold fronts that can drop temps in a few minutes often. I also had instances where it was hot in the 80's with high humidity with a south breeze. I would go buy groceries and come out with it in the 40's rainy and windy.
The west coast has summer fluctuations because of the relatively cool pacific ocean. I grew up in the San Fernando Valley near Los Angeles. It was far enough inland where it could get to 105 or even over 110 sometimes. But then a strong sea breeze would kick and and drop temps back into the 80's just a day later or even later that day.
Southern California (and similar places around the world) are perfect for this.
You have the cool waters of the pacific moderating a land area that's decently far south (LA is right at 34 degrees) so the averages are moderated.
But, you have the Santa Ana winds. Adiabatic compression causes the air temp to become very hot. Check out July 6, 2018 at KVNY. It hit 117 degrees which is insane. KLAX hit 92 basically 20 degrees above average.
Any areas adjacent to mountains can have some crazy changes due to Foehn winds (Chinook winds).
Believe it or not, north Texas can get pretty rowdy with temperature fluctuations. We've seen it a lot around here, it isn't just hot. Walked into a grocery store one morning at about 8am and the temperature was 75 and muggy. Walked out one hour later and the temperature had dropped almost 30 DEGREES and a dry wind was starting to howl down from the north. We've seen the most interesting temperature changes and weather spells here in Texas (we're originally from So Cal) in the last 5 years and have come to rather enjoy it. It's crazy to drop your kids off at school early in the morning and it's shorts and t-shirt weather and by the time you pick them up it's time to drag out the boots and fleece again, LOL.
Southern California (and similar places around the world) are perfect for this.
You have the cool waters of the pacific moderating a land area that's decently far south (LA is right at 34 degrees) so the averages are moderated.
But, you have the Santa Ana winds. Adiabatic compression causes the air temp to become very hot. Check out July 6, 2018 at KVNY. It hit 117 degrees which is insane. KLAX hit 92 basically 20 degrees above average.
Any areas adjacent to mountains can have some crazy changes due to Foehn winds (Chinook winds).
I don't think July 6, 2018 was the result of Santa Ana winds. Seemed like it happened concurrently with the Desert Monsoons, which usually raise the humidity even in Coastal SoCal. https://weather.com/forecast/regiona...nsoon-moisture
Santa Ana winds are very unusual during June, let alone July. They're concentrated in the Fall and Winter, sometimes blow during the Spring.
I don't think July 6, 2018 was the result of Santa Ana winds. Seemed like it happened concurrently with the Desert Monsoons, which usually raise the humidity even in Coastal SoCal. https://weather.com/forecast/regiona...nsoon-moisture
Santa Ana winds are very unusual during June, let alone July. They're concentrated in the Fall and Winter, sometimes blow during the Spring.
Well, maybe not exactly Santa Ana winds but the heat was from downslope winds which is what I was at least trying to allude to.
Well, maybe not exactly Santa Ana winds but the heat was from downslope winds which is what I was at least trying to allude to.
Interesting. It seems like these offshore winds are rare, though, as per the article, and in that case, were rapidly replaced by rising humidity in a day.
I was in Ranchi Bernardo right at that moment and did notice the humidity but don't remember the preceding offshore winds.
You have a one sided discussion. Who said extreme temperature fluctuations have to be warm?
Pretty much anything east of California can have temperature fluctuations, where a polar vortex coming from Canada can change temperatures 40-50 degrees in one day. A couple of weeks ago, Northern Nevada went from a high of 90 to 59 in two days.
So to answer your question, over 50% of the United States can have extreme temperature fluctuations.
Trivia:
A Polar Vortex is actually a pattern of winds resembling cyclones that flows around the North Pole all year round. Tbis also happens at the South Pole.
All of the west coast. The east coast has very stable summers and very unstable winters. The west coast is quite the opposite.
But the OP asked about Mild Summers with extreme temperature swings. The West Coast may be mild in summer, but the temperature on The West Coast doesn't fluctuate much.
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