Weather and Climate are distinct (and one should ignore the climate alarmists who claim that every storm, drought, flood, etc. is “proof” of climate change and the coming end of civilization – they are fools and saying a warm summer day proves something makes you into a fool).
If you want to consider “climate change” look at information as to what plants grew where (e.g. Romans always paid close attention to whether a place could support wine grapes). That data, suggests that the times of Bayis Sheini (the “classical period”) and the time of the Rishonim (the “high middle ages”) were worm, and the “dark ages” and the “early modern period” were cold periods. Oh, and warm periods were generally better for everyone (cold kills crops, warm lengthen the growing season) .