Regarding the question, why are our winters so cold? As stated in the video, we will continue to get cold weather, but the locations receiving the coldest weather may move due to climate change. For example, here’s todays weather in Buffalo, NY and North Pole, AK:
Buffalo: 5 degrees Fahrenheit
North Pole: 21 degrees Fahrenheit

The following figure illustrates the weird distribution of temperature in the Northern Hemisphere.