The two biggest temperature changes I have seen (and both were very abnormal) was in October of 1961 when a cold front moved in dropping our 80 degree Indian summer to 0 degrees the next day. And I was on a mountain elk hunting at the time, brrrrr.
The other was Jan of 1979 when an abnormal temp of -38 in the evening got hit with a chinook taking us to 45 above the next afternoon. As I said, both of these were very abnormal changes because we seldom see 80 degree weather or 0 degree weather in October and we seldom see anything below -20 in the winter although the 45 is normal when the chinook comes.
In any case, weather is always unpredictable, but with real time broadcasting, we are just more aware of world wide wierdness. And if our lives were long enough and our memory good enough, we would all have seen these cycles many times.