Hi Galen, in recent years, perhaps since the 90's, the climate in Madrid has been getting warmer. I guess something logical in a city that does not stop growing, with more asphalt, more urban traffic, more heaters in winter, more air conditioners in summer, etc. I could not say if there are more reasons that explain the change of climate here.
The adaptation for me is simple, flee from Madrid in August and wear less clothes in winter.
Best regards.