The average Temperature lows and highs for January in my hometown are usually about 20º to 40º. So, if it’s well below freezing now, how can there be ‘global warming’? Well, first of all, global warming refers to the whole planet, not only America, or your hometown.
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As an example, a strong high-pressure system or another weather event (as a direct result of global warming, like higher temperatures in the Arctic) will alter the course of the Jet Stream, making some areas of the country very hot, while others get very cold. Warmer than average temperatures in the Arctic alter the normal course of the jet stream, changing temperatures as far south as the United States. For further reference on this type of weather phenomena, please see: https://news.nationalgeographic.com/2017/07/global-warming-arctic-colder-winters-climate-change-spd/