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The place with the most days above 30C annually I could find is Middle Point, in the Northern Territory. It's located about 50km southeast of Darwin and has 337 days per year over 30C, including 143 over 35C.
In Northern Ireland we reach it like every 4 years or something. But I think maybe somewhere like Shannon down south will reach it every 2 years due to the Foehn effect.
In Canada it's Osoyoos in British Columbia at 34 days.
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