This is just natural fluctuations with the climate- been going on for the past entire history of the earth. What is happening right now is an unstable jet stream which (in America's current case) causes extreme fluctuations in temperatures depending on what side of the jet stream you end up on (right now, generally an abnormally cold West Coast and abnormally warm East Coast). People who are trying to fear monger you are just trying to get you to fall to their narrative.