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It is absolutely not normal.
https://www.metoffice.gov.uk/about-us/news-and-media/media-c...
Not great for food production. The UK is close enough to a wealthy nation that we should be able to import our food or make enough with high energy/resource requirements. There is a general problem with a lack of resources (hence all the global conflict going on now. Trump doesn't want Greenland because he looked at a Mercator map and got size envy due to his tiny hands, the resources there will go to China, Russia, Europe or the US), but that can be overcome.
The dirty secret of global warming is that Europe can't take a billion climate refugees - even the most bleeding heart liberals will baulk at the UK population increasing from 70m to 200m in a generation, its not sustainable.
America has less of a problem - the population of Central and South America between about 30N and 30S is 500 million. The population of Africa and Asia in that boundary is about 4.5 billion, and as those areas become uninhabitable due to wet bulb temperatures and water scarcity, people will either die or try to move north - mainly to Europe.