Glad to see you've got your thinking cap on, Joe!
Once the full vernalization requirement is met, I don't think there is a correlation of height to cold winter temps, unless the plants were cold damaged. I had a very very very long cold winter, but the minimum (temperature) wasn't below normal. Isn't that the same as you, Joe? Even though my spring was late (temperature wise), overall my lilies are taller than usual, I think, due to the abundance of moisture. And I just got 2.9 more inches of rain yesterday.
While the number of leaves and buds are largely preprogrammed in a bulb, how they develop is most dependent on the current conditions during time of expansion.
