Monterrey is famous for its extreme climate changes (srsly, look it upz). The highest temperature recorded in Monterrey was in August and it was a scorching-hot 113 Fahrenheit (45 Celsius), and the lowest recorded was in December, with 5 Fahrenheit (-15 Celsius)...
On to extreme changes..
Max temperature recorded for December: 34C (93F)
Min temperature recorded for December: -15C (5F)
Also, we sometimes get 40C (104F) hot waves one day and ice as precipitation the next day... this happens a lot during summers

(Specially hot ones).