Not only the Gulf Stream, but also the polar jet stream, which frequently dips down into the American midwest in winter, making the temperature in Indianapolis

Not only the Gulf Stream, but also the polar jet stream, which frequently dips down into the American midwest in winter, making the temperature in Indianapolis about as cold as it is much further north in Canada. Sometimes even colder. e.g. https://cms.accuweather.com/wp-content/uploads/2017/12/static-winter-jet-stream-example-1.jpg https://cms.accuweather.com/wp-content/uploads/2017/12/stati...