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When you make extrapolations like this, you must try to respect the longitude too. In this case it would be something like Mar del Plata but a bit colder and significantly more continental -as we'd have more landmass at middle latitudes, we may expect bigger highs in the winter, yet a good summer warming due to the amount of land. Nevertheless it would translate into just a couple of more degrees in terms of annual range.
In fact the western part of the (lowland) Amazon is the most prone to get hit by a freak polar air mass thanks to the Andes, that help them channel through the north. This is why Iquitos got much colder than Manaus during the 2010 "cold snap".
Tbh I would be concerned about the Amazon in this case, but I don't think it's gonna affect the entirety of it, rather just push it farther north. As of right now, the Amazon ends a bit to the south of Orinoco River. Could this change push the Amazonian rainforest to the north of Orinoco?
No, most of the US is much too far south in latitude, and this is made even worse by the continued migration of people to areas further south and west in the US to the faster growing metro areas. The Pacific Northwest climate is starting to look more favorable to me over time.
The Andes of Chile and Argentina would experience a massive increase of glaciers and ice fields. Ushuaia is likely to get buried by a restored Martial glacier.
That's definitely an exaggeration. We're talking just 5 degrees to the south.
The Central Andes are very dry due to the Pacific high; winter lows usually affect up to 30ºS approximately. North of this we have nude mountains where glaciers are often non-existent, even at 6000 m. Moving the continent 5º to the south, the high plateaus around Catamarca and La Rioja provinces (27/28ºS), that lie between 4500 and 5500 metres, would become affected by significant amount of snowfall, creating an ice field there.
Then, the Andes of Mendoza (where Aconcagua is found) and contiguous areas Chile are the southernmost place where mountains over 6000 m. occur. On average this area is not as high as the one previously mentioned, but moving it 5º to the south would expand the current glaciers, and not only would it become colder, but also snowier. The Cordón del Plata area would be heavily glaciated.
The Andes quickly become much shorter south of it, and whereas there would be larger glaciers here and there, the next big ice would be the Patagonian Field, whose current parts may be merged into one and it might get to Tierra del Fuego itself as a single entity.
We must take into account that glacier formation is very slow, and we'd need many many years for snow to become packed into ice fields that develop into glaciers. I assume a scenario in which the Americas always had this latitude.
Hurricane season sure would be interesting. Miami would be at the same latitude and equally exposed as the Philippines which sees multiple major hurricanes annually (the further south the more east/west the orientation of hurricane tracks so Florida would effectively loose the Cuba/Haiti shield). NYC would be in play for major hurricanes and its geography could bring some epic storm surges into the lower bay. Instead of a Charleston to Charlotte track, Hugo runs into Chesapeake Bay as a Category 4, up the Potomac and into DC.
San Francisco would have a gorgeous climate... probably very similar to San Diego! Downtown Eureka would resemble a mix of Monterey and Salinas with 22C avg highs in September.
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