You assume some kind of blizzard uniformity.
Yes, Sir! To an extent.
I do assume, that what goes as extreme weather conditions called "blizzard" in game terms, means:
1. Extreme cold (say, average daily temperatures below -10C, perhaps -20C at night, perhaps much worse, at any rate, enough to freeze a 200m wide river stiff within a week (one turn).
Clarification: The Svir River, by Voznesenye - its exit to Ladoga Lake, is a bit more than 200m wide, by the game standards it goes as "minor river". Now, within the game terms, the North Weather Zone produces a -4 freezing effect per turn during blizzard. That means, that within a week of blizzard, Svir gets frozen stiff, as with Ice 4 level it can be crossed even by Heavy Tanks without any penalties. We are talking asphalt, not water. That's pretty cold, don't you think? Blizzard in Central Zone is supposed to freeze an extremely wide and potent river within 3 weeks/turns. Acceptable simulation, to my mind.
2. Snowfall in the wind. Seriously cold (vide: 1.) wind. That's bad. Well, at least worse than "just" snow, in game terms. There seems to be a distinction (in game terms) between "snow" and "blizzard" for a reason, eh?
3. Needless to say, general misery descended upon anyone who cannot huddle under a warm blanket next to a hot stove under a roof, at lease from time to time. Both the stoves [fuel!] and blankets were obviously in short supply for Der Wehrmacht in '41, not ot mention the winter gear (warm clothes, eh?). That "roof over one's head" part is pretty nicely simulated by the town/city thing - - I cannot but agree with the approach (I'd actually give more bonus to fortification levels, but let's not muddle up the rant).
As far as I know, blizzard, in game terms, is not uniform, and I, actually, like the approach. Freezing of rivers goes differently per weatehr zone (+4 North... ... +1 Europe, as far as I know). So yes, in game terms, it's not the same blizzard everywhere. But it somehow becomes the same, uniform blizzard come December! No matter where your (not Mountain etc.) unit is posted, it starts to feel the wrath of General Winter. You'd like to discuss the "uniformity" of blizzard from Leningrad to Odessa on December 1, 1941? Bring it on! I'm here. I'd rather discuss the "First Winter Rules" not kicking in in an unlikely event of there bing a blizzard before December '41, which is my only point here...
My point, just to state it again: It's ether Blizzard, or it's not. You allow a (random weather) "blizzard" in November, it should bite as hard, as it would in December. If, as per new rules, you allow random weather blizzard (as unlikely, as it is in them charts) in October, it should bite as hard as a blizzard does. To my mind, it's either blizzard, or not. If it's blizzard, let it bite, if it's snow, let it fall.