Silkies technically don't have the normal top layer of feathers that keep the air layer locked in. They can be ok in our climate, but keep an eye when it gets really cold. Typically, the chickens breeds that do best are those that have rose combs, pea combs, or v combs. Large single combs, certain game cocks, and some of the more ornate mediterranean breeds like Spanish White faced Black, or Pendescenda, or Egyptian Faoumi won't do real well here. English chickens can do alright, especially Orpingtons. Some more breeds are Americaunas, Chauntecler, Hedemora(if you don't get hot summers, Hedemora are sensitive above 80F ) and other northern european or scandanavian, or russian breeds like Orloff, can all do well here. I like my Marans, they do tolerate the climate, both the hot summers and the cold winters. There are more than just these, you should be able to find lots more acclimated breeds. If you have a particular trait you are looking for in your weather tolerant breed, just ask! Generally, feed store chicks will do alright, so if that's what you are after, go for it! The best way to help your chickens survive the winters here is good housing. Use deep litter method in winter to help provide a little heat, make sure you are ventilating excess moisture and ammonia away from the coop, and use infrared heat if you must use heat. I wouldn't reccomend heating your whole coop up. If your chickens don't get used to the cold, it can be very shocking to them to get exposed when they aren't acclimated. It can lead to pneumonia! Providing extra calories when it is particularly cold, using special treats like corn, can really make a difference. I usually only feed out corn when it is brutal cold. It ferments a little in the crop, and it is pure calories. Corn is just sugar, but it burns hot! There are lot of other winter prep things, but I hope this helps a little.