well, I assume, there always were cold times in Great Valley region (and in any other regions), when planet changes its side and angle from sun (one time in year! lol). Dinosaurs felt small changes in environment and temperature, and they call such period as cold times (notice, they told this term in Stone of Cold Fire, before Big Freeze happened).
At the time of 8th movie, climate in this region changed, and temperature changing grew, causing snow fall and snowstorms.
After that, snow became usual event during cold times, a "normal occurrence", so I don't see any reason why dinosaurs should worry about it.
i said 5 cold times equals 50 years. But thats just a guesss
hah
I wonder why you started to think so
