Lows in the 30's means overnight lows, so I would figure 40, maybe 35 as the lowest you would be out and about.
Layers will be key. A water-resistent shell/rain jacket would be my starting point, with a fleece jacket/liner. The 3-in-1 type coats would be great for this sort of trip, and you should be able to use all the parts after you return. I wouldn't spring for Lands End or LL Bean, but the ones at Target/Kohls should be fine. Wear it onto the plane and then you don't take up any carry-on space. Add some gloves and a fleece or wool hat and you should be pretty well set. At that temp, I would either go with stretchy knit or maybe a slightly thicker fleece/knit with liner type glove or mitten - again, Target/Kohls level stuff should be fine. Leather and wool tend to not do well with water, so I would avoid them. I don't typically do a scarf at those temps, but I would go fleece over wool just from a ease of care perspective.
Synthetic long underwear is relatively inexpensive ($10-20 per set) and will make your regular clothes work just fine. I wouldn't bother with a wool sweater at that temp. Synthetic long underwear, long sleeve shirt and pants, fleece jacket with water/wind resistant shell should be plenty (and would be way overkill for those of us used to those temps).
My kids wear tennis shoes to and from school (so to and from the bus stop) all year round, so I don't know that I would do anything other than having a second pair of shoes in case they get wet enough that you need to dry them. Wool or synthetic blend socks, but 30 is not enough for us to wear them daily, that is more of a camping/skiing/sledding thing.
Last edited by o_mom; 08-18-2019 at 03:05 PM.
Mama to three boys ('03, '05, '07)