Those skinny needles you see on evergreen trees are actually leaves that are rolled up very tightly. They are beautifully compact and adapted to withstand hard, dry conditions. Needles therefore lose little water when it is in short supply. They are also long and thin to shed the snow and contain little sap for freezing.
However, holding on to needles is also extremely risky. Snow lands on the branches and accumulates until the load is so heavy it can break the tree. The evergreen employs two defense mechanisms to avoid this. First, it grows an absolutely straight trunk, with downward-sloping branches. As soon as snow lands on them, they gradually angle down until they are layered on one top of each other like tiles on a roof. This means that most of the snow falls around the tree and not on it. This design also means that their built-in umbrellas intercept one third of the rain that falls. This pyramidal shape also helps evergreens receive the maximum amount of light from sun low on the horizon.
Today, some people plant trees in climates that are too warm. In these places, evergreens are always hot and thirsty. Evergreens like it cool and moist. Thanks to climate change, fall temperatures are remaining higher and the growing season longer, stressing out the evergreen. In my estimation, deciduous trees will have a better chance of surviving in the future.