My recommendations (and I've actually been to Lake Kapuskasing, in February, when it's -40C).
-30C isn't that bad.... -22F. The thing to watch out for is the wind.
When the weather is that cold, I typically wear (if I'm going outside) a set of medium poly long underwear (tops and bottoms), a poly fleece sweater with a 1/4 zip, a poly jacket, and a Cabelas down parka http://www.cabelas.com/product/M-TRA...ka%26CQ_st%3Db.
I will wear poly fleece pants and a pair of GI wool field pants with over shell (and suspenders), and a waterproof layer on the bottom http://www.cabelas.com/product/cloth..._SEQ_104176980
And snowmobile boots https://www.amazon.com/Sorel-Alpha-P...ots%2Bmen&th=1
A scarf!
Boots don't have to be $500 - thats stupid, you're not climbing Mt. Everest. A pair of Sorel's or equal for $100 is fine. A pair of very lightweight liner socks and a pair of heavy insulating socks. Get the boots a size bigger to fit over the socks https://www.amazon.com/Sorel-Mens-Ca...ots%2Bmen&th=1
Windproof is more important that waterproof for the outer layer. You don't want sweat to build up on the clothes and you won't get precipitation at -30.
A hat - a bomber or whatever, that covers the ears. Some sort of Balaclava too.
Gloves - at those temps, I wear snowboarding gloves (no, I don't snowboard). Or Mitts (better), with liner gloves.
For pants, I'd include a pair of (heavy) fleece sleep pants....I get mine at Walmart. Sitting in a snow blind, it will get cold...Jeans are right out - they're called hypothermia pants for a reason. If you can't wear wool, then poly fleece is the way to go, with a windproof BREATHABLE layer on the outside.
I would also take a heavy-duty space blanket https://www.amazon.com/Space-All-Wea...2Bblanket&th=1
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