My husband and I live in Greenville, South Carolina, USA and will depart on the Scandinavia July 9th trip. I am getting anxious about packing. I have been tracking the weather, but don't really know what exactly to "pack in layers"... I can bring lots of lighter stuff to layer up, but should I be considering packing a down layer? I feel that no matter what I pack, somehow my choices are going to jinx the weather...