I can't believe we are looking at a legitimate snow storm on the second day of April. I only have one tree that is starting to leaf out and I thought, "lows of 32F-33F, even with snow, should do no damage to new leaves because the temperature is not going to be below freezing". Then I thought again and remembered from my experience in Florida how tender vegetation is damaged by contact with frost (which is freezing), even when the air temperature at 5 feet above ground is well above freezing. So perhaps the same principle applies? On the other hand, the difference might be that, for example, the foliage of a coconut palm and other tropical species, is damaged/killed by exposure to temperatures right around (and below of course) freezing, whereas the tissues in the brand new leaves of a temperate tree such as a maple may not be damaged until temperatures fall to, say 27F-29F. Thus, contact with snow and air temperatures in the low 30s would not damage a maple?