I suppose no snowshoes in that 13lb baseweight? No ski poles or ice axe? No shelter that can actually take 60mph winds either. Is there a shovel in that list? Bet not, so you can't even create a snowcave in case the weather decides to crap out on you. No ice axe either is there?
A winter shelter if its not a Bivy bag by itself is going to take 3-4lbs simply to sustain the winds in the mountains. Of course a bivy bag that can withstand contact with ice is going to weigh in around 1.5-2lbs by itself. Yea, you can get throw away bivy bags that are lighter, but you better like throwing them away. Add in trecking poles/ice axe.
SO far this takes me to a baseweight of 3-4lb + 3lb + 1lb or 8 of your 13lbs and haven't even addressed backpack day clothes verses night clothes/sleeping system as you are going to sweat. If you claim tiny 2lb total 25inch long snowshoes I will laugh myself silly as you must like post holing instead actually floating on top of the snow. 25inch snowshoes don't even work except on the thickest of cascades concrete snow after it has rained for a day.
0F and sleep system of about 3lbs if you use your day clothes and proper VB(vapor barrier) clothing so clothes stay dry at best that would mean no padding between you and the sub 0F snow. Add in a pad that you can actually suffer the night through for more than a single night IE going out for a week and we are talking another 1.5lbs.
Stove and fuel as there won't be running water… Another pound or 2 right there… If out more than 2 days far more than that.
To claim 13lbs for 0 degree F winter weather is an absurd claim. I note you never posted your gear list either… 13lbs into the Rocky mountains, the Sierra mountains, the Cascade Mountains, or NY, in winter time unless its at most for 1 night emergency survival "training" is laughably absurd. Those people are called "rescue Missions" for the local SAR.
I mean I like a tall wives tale as good as the next sucker, but common. Try a modicum of reality. IF you claimed Near 20lbs. Ok, gotcha. Climbing a peak from basecamp and expecting it to take more than a full day and looking at overnighting, sure 13lbs.
I get tired of BS posts. 13lbs for summer hiking, sure no problem, but winter in a non emergency situation? HAHAHA.
Sorry you hit my pet peeve.