The weather was warm two days ago, 10 degrees. How can it not snow?

My personal understanding is that it is more accurate to look at the lunar calendar when it is weather. It's still the first month, and the next snow is normal, at least in ancient times, it won't arouse suspicion. In addition, the high pressure comes suddenly, because it is still warm, so the sudden cooling at high altitude will inevitably cause precipitation. But the weather this year is really strange, but no matter how strange it is, it is not as strange as the heavy snow in the south last year, right? I remember a report that the earth entered the first ice age (forgotten), and the earth had the warmest century and the coldest century, alternating cycles. Some scientists speculate that the extinction of dinosaurs was caused by this cycle, and now the earth will get colder and colder in the next ice age. The interior of the earth will get hotter and hotter, which is also the cause of melting glaciers and rising sea levels, not caused by carbon dioxide, which is also the latest discovery of scientists. However, it is estimated that the total temperature will not change much. Anyway, if you die, the ice age will not come. Live a good life and don't worry about it.